Skip to content


  • Research article
  • Open Access

Removal of tetracycline from wastewater using pumice stone: equilibrium, kinetic and thermodynamic studies

Journal of Environmental Health Science and Engineering201412:79

  • Received: 2 April 2013
  • Accepted: 21 April 2014
  • Published:


In this study, pumice stone was used for the removal of tetracyline (TC) from aqueous solutions. It was characterized by XRD, FT-IR, SEM and BET analyses. Cation exchange capacity of pumice stone was found to be 9.9 meq/100 g. Effect of various parameters such as solution pH (2–11), adsorbent dosage (0.5-10 g/L), contact time (2.5-120 min), initial TC concentration (5–300 mg/L) and temperature (20–50°C) on TC adsorption onto pumice was investigated. Also the adsorption of TC on pumice stone was studied as a function of Na+ and Cu2+ cations changing pH from 2 to 11 using batch experiments. The best removal efficiency performance was exhibited at adsorbent dosage 10 g/L, pH 3, contact time 120 min. Langmuir, Freundlich and Dubinin-Radushkevich (D-R) isotherm models were applied to the equilibrium data. The result has shown that the adsorption was favorable, physicochemical in nature and agrees well with Langmuir and Freundlich models. The maximum Langmuir adsorption capacity was found to be 20.02 mg/g. The adsorption behavior of TC on pumices stone was fitted well in the pseudo-second order kinetics model. Thermodynamic parameters calculated from the adsorption data at different temperature showed that the adsorption reaction was feasible, spontaneous and exothermic.


  • Tetracyline
  • Antibiotic
  • Adsorption
  • Pumice stone
  • Na+
  • Cu2+


Antibiotics are used the worldwide in human and veterinary medicine for about 70 years [13]. TCs are the second most common antibiotic family in both production and usage in the world [4]. TCs are relatively poorly absorbed by humans and animals. Large fractions of antibiotics including TC are excreted through urine and feces as unmodified main compound [3, 59].

Residues of TC are frequently detected in soil and various environmental water samples such as surface water, ground water and drinking water [1, 3, 5, 1012]. The presence of residual antibiotics in soil and water is potentially hazardous for the bacteria and non-target organisms and these can promote the selection of genetic variants of microorganisms resulting in the occurrence of antibiotic resistant pathogens [1317].

The chemical structure of TC and the speciation diagram of TC as a function of pH are given in Figure 1a and Figure 1b, respectively. The pKa values of TC are 3.3, 7.7 and 9.7 [18, 19].
Figure 1
Figure 1

Chemical structure (a) and the speciation diagram (b) of TC as a function of pH.

TC molecule is strongly polar and has three protonactive groups: a dimethylamine (C-4), a tricarbonylamide group (C-1:C-2:C-3) and a phenolic diketone groups (C-10:C-11:C-12) (Figure 1) [3, 9, 20, 21].

Many adsorbent has been used for TC removal from wastewaters; in this study the pumice stone was used for TC removal from wastewaters with comprehensive research.

TCs are highly adsorbed by several materials such as clay, montmorillonite, rectorite, palygorskite, chitosan particles, oxide minerals, humic substances, soil, activated carbon and sediments [3, 7, 15, 17, 20, 2229].

Pumice is a light, porous and volcanic stone with a large surface area. It is generally pale in color, ranging from white, cream, blue or grey, to green-brown or black [30] and used as an adsorbent, filter bed and support material in water and wastewater treatment [3133].

In this study, effects of solution pH, adsorbent dosage, temperature, Na+ and Cu2+ cations on the TC adsorption by pumice stone were investigated. The adsorption isotherms, kinetics and thermodynamics were studied by batch experiments. In addition, the experimental results were combined with XRD, FT-IR and SEM analyses in order to identify in the interaction between pumice stone and TC and the specific surface area and components of pumice stone were determined by BET and XRF analyses, respectively.

Materials and methods


Pumice stone was supplied from Kayseri-Basakpınar in Turkey. It was washed with distilled water several times and dried at 50°C in oven. Later, particle size of dried pumice stone was grinded to 0.125 mm below. The physicochemical properties and XRF analysis of pumice stone are listed in Table 1 and Table 2, respectively. Cation Exchange Capacity (CEC) was determined through ion exchange of sodium and potassium ions in the effluent.
Table 1

Properties of pumice stone



Specific surface area (m2g−1)

Total pore volume (cm3g−1)

Mean pore diameter (nm)


CEC (meq/100 g)

Pumice stone

Light grey/brown granular






Table 2

XRF analysis of pumice stone


% by weight


% by weight



























Loss on ignition









Batch experiments

The batch experiments were carried out in 250 mL Erlenmeyer containing 100 mL of aqueous solution. pH was adjusted with HCl and NaOH. The suspension was shaken in temperature controlled shaker at 130 rpm. The residual concentration of TC in supernatant was analysed by CHEBIOUS UV-spectrophotometer at λmax value of TC (357 nm wavelength). Effects of solution pH (2.0-11), adsorbent dosage (0.5-10 g/L), contact time (2.5-120 min), initial TC concentration (5–300 mg/L) and temperature (20–50°C) on adsorption of TC by pumice stone were investigated. In addition, the effects of Na+ and Cu2+ cations on the TC adsorption were investigated as a function of pH. The details of the experimental conditions are presented in Table 3.
Table 3

Experimental conditions

Experimental conditions


Aim of experiment

Solution pH

TC conc. (mg/L)

Adsorbent dosage (g/L)

Contact time (min)



Effect of solution pH





Room temperature (20°C)


Effect of adsorbent dosage





Room temperature (20°C)


Adsorption kinetics





Room temperature (20°C)


Adsorption equilibrium tests





Room temperature (20°C)


Effect of temperature







Effects of 0.01 M Na+ and 0.1 mM Cu2+





Room temperature (20°C)

The adsorption capacity (qe, mg/g) and removal efficiency (%) were determined with following equations:
q e = C o C e V m
Re movalefficiency % = C o C e C o × 100

where C o and Ce are the initial and the equilibrium TC concentration (mg/L), V is the volume of solution (L) and m is the amount of pumice stone (g).

Results and discussion

Adsorbent characterization

XRD, FT-IR and SEM analyses of pumice stone before and after (TC-P) the adsorption of TC are shown in Figures 2, 3 and 4, respectively.
Figure 2
Figure 2

XRD patterns of pumice stone (a) and TC-P (b).

Figure 3
Figure 3

FT-IR spectra of pumice stone and TC-P.

Figure 4
Figure 4

SEM images of pumice stone (a) and TC-P (b).

According to the result of XRD pattern of the pumice stone, there were three peaks at 22, 28 and 59° (Figure 2). These peaks related to the mineral dachiardite (Ca, Na, K, Al, Si, H2O). The 100 peak of the quartz is known to be at 2θ = 26.65°. This finding points out amorphous quartz substance [34]. Similar results were also observed with the studies of other researchers [3436]. The peaks of TC-P were observed at 28 and 31°. The changes of peaks are evidence of TC adsorption. As can be seen from XRF results, the two most important components of the pumice stone were SiO2 (69.27%) and Al2O3 (14.24%) (see Table 1). It can be concluded that the higher the silica percentage, the purer the pumice stone will be [34].

The most characteristic peaks of pumice stone and TC-P are 800, 1700 and 3500 cm−1. The peak at 800 cm−1 in FT-IR spectra of the pumice stone (Figure 3) may have resulted from the Si-O bending strength vibrations of the amorphous quartz. The peak at 1700 cm−1 can be assigned to amide I or C = O amide stretching and the amide group played an important role in TC adsorption. The other peak was observed around 3500 cm−1. This peak indicates the OH stretching vibrations of the adsorbed water (moisture) by the pumice stone from the outside environment [34, 37]. These peaks were also determined with prior studies [34, 37, 38].

As can seen be from FT-IR spectra of TC-P, the peak at 1700 cm−1 of TC-P were observed different from the natural pumice stone. The band changes of amide I or C = O amide groups at 1700 cm−1 demonstrated that TC was adsorbed to the pumice stone with cation exchange and surface complexation [39].

The SEM images of natural pumice stone and TC-P indicated that the surface of pumice stone had a large porous surface and external surface of pumice stone was covered by TC, respectively (Figure 4). In addition, the specific surface area, total pore volume and mean pore diameter of pumice stone were 11.88 m2g−1, 0.0410 cm3g−1 and 13.813 nm, respectively.

Effects of solution pH and Na+ and Cu2+ cations on adsorption

The effects of solution pH and Na+ and metal cation (Cu2+) on the TC adsorption onto pumice stone were investigated and results are shown in Figure 5. It can be seen that the adsorption of TC onto pumice stone was highly affected with the solution pH. When the solution pH was less than pKa2 (7.7) of TC, adsorption capacity of pumice stone varied from 3.80 mg/g to 2.30 mg/g at initial concentrations of 50 mg/L (Figure 5). Above pKa2, TC adsorption capacity of pumice stone decreased sharply to 0.59 mg/g at pH 10. This pH 10 and above there was almost no removal of TC from solution any more. Similar results were reported for TC adsorption onto graphene oxide and humic acid by other researches [3, 9].
Figure 5
Figure 5

Effect of pH, Na + , Cu 2+ on TC adsorption and pH pzc.

The zero point of charge (pHpzc) of pumice stone was found to be 8.34 (Figure 5). According to PZC value, pumice stone was positively charged at pH < 8.34 and negatively charged at pH > 8.34. The pKa values of TC molecule were 3.3, 7.7 and 9.27, respectively [1, 40]. TC existed as cationic in strong acid solution at pH < 3.3, zwitter anions at 3.3 < pH < 7.7 and negative ions at pH > 7.7 [1, 40, 41]. In this case, adsorption mechanisms depending on pH were given in Table 4.
Table 4

Adsorption mechanisms depending on pH values

Studied pH range

Adsorption Mechanisms

2.0 < pH < 3.0

Cation exchange

3.0 < pH < 7.0

Cation exchange and surface complexation

pH 8.0

Surface complexation

Positively charge pumice stone < pHpzc < negatively charge pumice stone.

The cation exchange mechanism between cations of TC and positively charged pumice stone surface was dominated at low pH values. A surface complexation mechanism for zwitter anion of TC was important, which was accompanied with proton uptake on pumice stone [19, 23, 42]. Physical mechanisms such as van der Waals forces attraction and hydrogen bonding between polar TC groups and acidic groups on the surface of pumice stone may also contribute to surface complexation mechanism in TC adsorption [22, 23]. The decrease in TC removal under alkaline conditions may be due to competition of excess hydroxyl ions with anion TC for active sites on pumice stone [30]. The pHPZC values of pumice stone in literature ranged between 6.9 and 9.3 [32]. The PZC value found in study is compatible with literature.

In order to determine the effects of Na+ and Cu2+ ions on the TC adsorption, 0.1 mM Cu2+ and 0.01 M Na+ cations were simultaneously adsorbed with TC at initial concentration of 50 mg/L. The results of TC adsorption by pumice stone in the presence of Na+ and Cu2+ was nearly similar. However, the presence of Cu2+ slightly increased TC adsorption on pumice stone at low pH (pH < 5). As a transitional metal cation, Cu2+ could form strong complexes both with TC and pumice stone [1, 39]. Therefore, Cu2+ may role as a bridging ion on TC adsorption. The presence of Cu2+ had only minor effects on TC adsorption on pumice stone at high pH due to the formation of CuOH and Cu(OH)2[1]. Similar observations were reported on the TC adsorption onto soil and sediment in the presence of copper [1]. On the other hand, the presence of Na cation decreased on TC adsorption. This condition can be explained as the results of an electrostatic competition between TC cations and Na+ cations for adsorption to the same binding sites on surface of pumice stone. Similar results were also observed by other researchers [3, 4].

In addition, the results were expressed with adsorption partition coefficient (KD (L/eq)) defined in below [18, 19]:
K D = q e C e × CEC
The plot of KD against pH is presented in Figure 6.
Figure 6
Figure 6

The plot of K D against pH.

The adsorption partition coefficient is expressed with respect to the CEC because interactions of the TC with specific charge sites on surface of the pumice stone were anticipated [18]. The adsorption partition coefficients (KD) were relatively high at pH 2 and 3 and decreased at pH 4–9 and remained nearly constant between pH 9–11. The results of adsorption capacity (qe) and adsorption partition coefficients (KD) are compatible with each other and KD and qe values decreased with increasing pH value. In this case, the pH value was selected as 3 in further studies.

Effect of adsorbent dosage on adsorption

The effect of adsorbent dosage on TC adsorption was studied in the range of 0.5-10 g/L. The TC removal and adsorption capacity at various adsorbent dosages are presented in Figure 7. According to Figure 7, TC percentage removal from 17% to 74% increased with increasing the adsorbent dosage from 0.5 to 10 g/L. The increase of TC adsorption is due to the availability of active binding sites and to the presence of a greater surface area for adsorption [30]. Therefore, the optimum dosage of pumice stone for further experiments of TC adsorption was selected as 10 g/L.
Figure 7
Figure 7

Effect of adsorbent dosage on TC adsorption.

Kinetics of TC adsorption onto pumice stone

The effect of contact time in the range of 2.5-120 min and kinetics were calculated. The results regarding TC removal and adsorption capacity are presented in Figure 8.
Figure 8
Figure 8

Effect of contact time on TC adsorption.

As shown in this figure, the fifty percent of TC adsorption occurred in the first 30 min and then the adsorption gradually reached equilibrium after 90 min contact time. The kinetic of TC adsorption on pumice stone was analyzed using the pseudo first-order Lagergren, pseudo second-order model and intraparticle diffusion model (Figures 9 and 10).
Figure 9
Figure 9

The pseudo first-order kinetic model of TC adsorption on pumice stone.

Figure 10
Figure 10

The pseudo second-order kinetic model and the intraparticle diffusion model of TC adsorption on pumice stone.

The pseudo first-order kinetic model of Lagergren is given as [30]:
log q e q t = log q e k 1 2.303 t
The pseudo second-order kinetic model is expressed as [30]:
t q t = 1 k 2 q e 2 + t q e
The intraparticle diffusion model equation can be described as [43]:
q t = k d t 0.5 + C

where qe (mg/g) and qt (mg/g) are the amounts of adsorbed TC on pumice stone at equilibrium and time t (min), C is the intercept and k 1 (min-1), k 2 (g/mg.min) and kd (mg/g.min0.5) are the rate constant of pseudo first-order kinetic model, pseudo second-order kinetic model and intraparticle diffusion model, respectively. A straight line of log (q e -q t ) versus t suggest the applicability of pseudo first-order kinetic model. q e and k 1 can be determined from the intercept and slope of the plot, respectively. The plot t/q t versus t should give a straight line if pseudo second-order kinetics are applicable and q e and k 2 can be determined from the slope and intercept of the plot, respectively. The intraparticle diffusion model rate constat (kd) and C can be evaluated from the slope and intercept of the linear plot of qt versus t0.5, respectively [44, 45]. According to this intraparticle diffusion model, the plot of qt versus t0.5 should be linear (C = 0) if intraparticle diffusion is involved in the overall adsorption mechanism and the intraparticle diffusion is the sole rate controlling step of the process. If this line did not through the origin (C ≠ 0), there are intraparticle diffusion and boundary layer effect in adsorption process. As the intercept value (C) increase, the effect of surface sorption in the rate controlling step increase [46].

The following expression denotes the initial sorption rate h (mg/g min):
h = k 2 q e 2
The values of correlation coefficients (k1,k2, kd), equilibrium adsorption capacities (qe,teo) in these models (pseudo first-order kinetic model, pseudo second-order kinetic model and intraparticle diffusion model) and initial sorption rate (h) are given in Table 5.
Table 5

Kinetic parameters of the TC adsorption


Pseudo-first order

Pseudo-second order

Intra particle

h (mg/g.min)



k1 (min-1)

qe, cal


k2 (g/mg.min)

qe, cal


kd (mg/g.min0.5)













According to the fitted linear regression plots, the experimental data are well fitted to the pseudo-second order kinetic model with higher value correlation coefficient (R2 > 0.999) compared to pseudo-first order kinetic model. Kinetics of TC adsorption on pumice stone followed the pseudo-second order model, suggesting that the adsorption rate limiting step may be chemisorptions and the adsorption of TC occurs probably via surface complexation reactions at specific adsorption sites [20, 30, 47]. In addition, present study, the plots indicated that the intraparticle diffusion model was not the sole rate controlling step due to did not pass through the origin (C ≠ 0). This indicated that both intra particle diffusion and boundary diffusion affected the TC adsorption on pumice stone.

Adsorption isotherms

In this study, the Langmuir, Freundlich and D-R adsorption models were used to describe the adsorption equilibrium. All isotherm models parameters were calculated by non-linear regression by using Sigmaplot 11 software. The equation of the Langmuir model is given [48]:
q e = Q m b C e 1 + b C e
where, Q m (mg/g) is the maximum adsorption capacity and b (L/mg) is the Langmuir constant related to the affinity between adsorbent and sorbate. The essential feature of the Langmuir isotherm can be expressed in terms of RL, a dimensionless constant referred to as separation factor or equilibrium parameter. RL is calculated using the following equation [49]:
R L = 1 1 + b C o

The value of RL indicates the type of the isotherm to be irreversible (RL = 0), favorable (0 < RL > 1), linear (RL = 1) or unfavorable (RL > 1).

The Freundlich isotherm is derived to model multilayer adsorption and adsorption on heterogeneous surfaces. The Freundlich isotherm is given by equation [48]:
q e = k F C e 1 n

where, k F (L/g) is the Freundlich adsorption constant related to the adsorption capacity. n is the adsorption intensity. The 1/n values were between 0 and 1 indicating that the adsorption was favorable at studied conditions.

D-R isotherm is more general than the Langmuir isotherm. It was applied to separate the nature of adsorption processes as physical or chemical. The D-R isotherm equation is expressed as follows [50]:
q e = q D R e β ϵ 2
where q e (mol/g) is the amount pollutions adsorbed on the adsorbent at equilibrium, qD-R (mol/g) is the maximum adsorption capacity, β (mol2/J2) is a coefficient related to the mean free energy of adsorption, and ϵ (J/mol) is the Polanyi potential that can be written as:
ϵ = RT ln 1 + 1 C e
The constant β gives an idea about the mean free energy E (kJ/mol) of adsorption can be calculated using the relationship:
E = 1 2 β

If E value is between 8 and 16 kJ/mol, the adsorption process follows by chemical ion-exchange and if E < 8 kJ/mol, the adsorption process is likely physical adsorption.

Adsorption isotherms for TC on pumice stone are given in Figure 11. The isotherm constants calculated from the Langmuir, Freundlich and D-R isotherm models and the correlation coefficients are given in Table 6.
Figure 11
Figure 11

Langmuir, Freundlich (a) and D-R (b) isotherm models.

Table 6

Langmuir, Freundlich and D-R adsorption isotherm parameters of TC






Qm (mg/g)

b (L/mg)



kF (L/g)



qD-R (mol/g)

qD-R (mg/g)

E (kJ/mol)

β (mol2/J2)















*RL value calculated in 100 mg/L initial TC concentration is given.

The correlation coefficients of Langmuir (R2 0.978), Freundlich (R2 0.994) and D-R (R2 0.992) models well fitted the adsorption data. The TC adsorption is compatible with both Langmuir and Freundlich isotherms. The applicability of both Langmuir and Freundlich isotherms on the adsorption of TC onto pumice stone shows that adsorption occurs under monolayer and heterogeneous surfaces. From Langmuir model, the maximum adsorption capacity (Qm) was determined to be 20.02 mg/g. Using the Freundlich model, kF and 1/n were found to be 0.99 and 0.52, respectively. The 1/n heterogeneity value was between 0 and 1 indicating that the TC adsorption on the pumice stone was favorable at studied conditions.

The Qm values of various adsorbents for TC antibiotics are presented in Table 7[1, 3, 19, 25, 51].
Table 7

Maximum adsorption capacity (Q m ) of various adsorbents for TC




Pumice stone


This study

Magnetite nanoparticles (Fe3O4 MnPs)



Graphene oxide






Activated sludge






The calculated RL values range between 0 and 1, indicating that the TC adsorption on pumice stone is favorable.

The mean free energy (E; kJ/mol) values calculated from the D-R isotherm model were also determined between 8 and 16 kJ/mol. It was indicating that the adsorption is mainly a chemical process occurs through cation exchange.

Thermodynamic parameters

In order to explain the mechanism of TC adsorption onto pumice stone, the thermodynamic parameters of adsorption were calculated using free energy change (ΔG), enthalpy change (ΔH) and entropy change (ΔS) given by Equations 11 and 12 [1]:
ΔG = RT ln K C

where ∆G is the Gibbs free energy change, R is the universal gas constant (8.314 J/mol K), T is the temperature (K) and K C (qe/Ce) is the equlibrium constant.

The entalpy change (∆H) and entropy change (∆S) parameters were estimated from the following equation:
ln K C = Δ S R Δ H RT
where the ∆H and ∆S in the biosorption process was determined from a slope and intercept of the plot of ln K C versus 1/T, respectively. The values of ∆H, ∆S and ΔG were calculated using equations 11 and 12 (Table 8).
Table 8

Thermodynamic parameters of TC adsorption on pumice stone


Temperature (K)


∆H (kJ/mol)



∆S (kJ(molK)−1)



∆G (kJ/mol)












The value of ΔH and ΔG were negative, indicating that the TC adsorption process is feasible, spontaneous and exothermic. The positive value of ∆S shows the increased in randomness at the solid/liquid interface during the adsorption process.

The analysis of ions in aqueous solution after TC adsorption

The amounts of ions (Ca2+, Mg2+, Na+, K+ and Fe3+) in aqueous solution after TC adsorption at optimum conditions (pH 3.0, 50 mg/L TC concentration, 10 g/L pumice stone, 120 min, room temperature) were analyzed and the results were given in Table 9.
Table 9

The amounts of ions passing from pumice stone into TC solution


Concentration (mg/L)





Na +






Total ion amount


According to Table 9, total ion amount in aqueous solution after TC adsorption at optimum conditions is 31.78 mg/L. The amount of adsorbed TC by pumice stone at optimum conditions is 37.09 mg/g. In this case, a major part of TC adsorption on pumice stone realized with cation exchange between ions (Ca2+, Mg2+, Na+, K+ and Fe3+) in pumice stone with TC antibiotics.


In this study, pumice stone was used as a new adsorbent for TC antibiotics removal from the aqueous solution. XRD, FT-IR and SEM data show that TC species adsorbed onto pumice stone. The adsorption mechanism of TC on pumice stone was cation exchange and surface complexation. The adsorption process is pH dependent and the optimum pH was found to be 3. The adsorption isotherm data for pumice stone could be fitted well by both Langmuir and Freundlich isotherm models. The maximum adsorption capacity (Qm) was found to be 20.02 mg/g. TC adsorption reached equilibrium within 90 min and adsorption kinetics fitted well to the pseudo-second order kinetic model. In the presence of Na+ cations, the TC adsorption decreased with increasing pH. The presence of Cu2+ was facilitated TC adsorption on pumice stone at low pH. Also, the TC adsorption onto pumice stone is found to be feasible, spontaneous and exothermic from thermodynamic studies.

The band changes of amide I or C = O amide groups in FT-IR spectra of TC adsorption on pumice stone was demonstrated that TC was adsorbed to the pumice stone with cation exchange and surface complexation.

The pumice stone was found to be an efficient adsorbent for the removal of TC antibiotics from aqueous solution. However, the effect of pretreatment for enhances the adsorption capacity of pumice stone can be examined in further studies.



We would like to thank Rresearch and Application Center of Erciyes University (TAUM), for their help in XRD, FTIR and SEM analysis.

Authors’ Affiliations

Department of Environmental Engineering, Engineering Faculty, Cumhuriyet University, Sivas, 58140, Turkey


  1. Zhang D, Niu H, Zhang X, Meng Z, Cai Y: Strong adsorption of chlorotetracyline on magnetite nanoparticles. J Hazard 2011, 192: 1088–1093. 10.1016/j.jhazmat.2011.06.015View ArticleGoogle Scholar
  2. Kümmerer K: Antibiotics in the aquatic environment—a review Part I. Chemosph 2009, 75: 417–434. 10.1016/j.chemosphere.2008.11.086View ArticleGoogle Scholar
  3. Gao Y, Zhang YLL, Huang H, Hu J, Shah SM, Su X: Adsorption and removal of tetracycline antibiotics from aqueous solution by graphene oxide. J Colloid Interface Sci 2012, 368: 540–546. 10.1016/j.jcis.2011.11.015View ArticleGoogle Scholar
  4. Gu C, Karthikeyan GK: Interaction of tetracycline with aluminum and iron hydrous oxides. Environ Sci Technol 2005, 39: 2660–2667. 10.1021/es048603oView ArticleGoogle Scholar
  5. Ji L, Chen W, Duan L, Zhu D: Mechanisms for strong adsorption of tetracycline to carbon nanotubes: A comparative study using activated carbon and graphite as adsorbents. Environ Sci Technol 2009, 43: 2322. 10.1021/es803268bView ArticleGoogle Scholar
  6. Ji LL, Chen W, Zheng JBSR, Xu ZY, Zhu DQ, Alvarez PJ: Adsorption of tetracycline on single-walled and multi-walled carbon nanotubes as affected by aqueous solution chemistry. Environ Toxicol Chem 2010, 29: 2713. 10.1002/etc.350View ArticleGoogle Scholar
  7. Wang YJ, Jia DA, Sun RJ, Zhu HW, Zhou DM: Adsorption and Cosorption of tetracycline and Copper(II) on Montmorillonite as Affected by Solution pH. Environ Sci Technol 2008, 42: 3254. 10.1021/es702641aView ArticleGoogle Scholar
  8. Li R, Yuan Q, Zhang Y, Ling J, Han T: Hydrophilic interaction chromatographic determination of oxytetracycline in the environmental water using silica column. J Liq Chromatogr Relat Technol 2011, 34: 511. 10.1080/10826076.2011.556971View ArticleGoogle Scholar
  9. Gu C, Karthikeyan KG, Samuel D, Sibley J, Pedersen A: Complexation of the antibiotic tetracycline with humic acid. Chemosph 2007, 66: 1494–1501. 10.1016/j.chemosphere.2006.08.028View ArticleGoogle Scholar
  10. Brown KD, Kulis J, Thomson B, Chapman TH, Mawhinney DB: Occurrence of antibiotics in hospital, residential, and dairy effluent, municipal wastewater, and the Rio Grande in New Mexico. Sci Total Environ 2006, 366: 772–783. 10.1016/j.scitotenv.2005.10.007View ArticleGoogle Scholar
  11. Karthikeyan KG, Meyer M: Occurrence of antibiotics in wastewater treatment facilities in Wisconsin. USA Sci Total Environ 2006, 361: 196–207. 10.1016/j.scitotenv.2005.06.030View ArticleGoogle Scholar
  12. Sun HY, Shi X, Mao JD, Zhu DQ: Tetracycline sorption to coal and soil humic acids: An examination of humic structural heterogeneity. Environ Toxicol Chem 2010, 29: 1934–1942.Google Scholar
  13. Santosa LH, Araújoa AN, Fachinia A, Penab A, Delerue-Matosc C, Montenegro MCBSM: Ecotoxicological aspects related to the presence of pharmaceuticals in the aquatic environment. J Hazard Mater 2010, 175: 45–95. 10.1016/j.jhazmat.2009.10.100View ArticleGoogle Scholar
  14. Jindal A, Kocherginskaya S, Mehboob A, Robert M, Mackie RI, Raskin L, Zilles JL: Antimicrobial use and resistance in swine waste treatment systems. Appl Environ Microbiol 2006, 72: 7813–7820. 10.1128/AEM.01087-06View ArticleGoogle Scholar
  15. Kim SP, Park HK, Chandran K: Propensity of activated sludge to amplify or attenuate tetracycline resistance genes and tetracycline resistant bacteria: a mathematical modeling approach. Chemosph 2010, 78: 1071–1077. 10.1016/j.chemosphere.2009.12.068View ArticleGoogle Scholar
  16. Jeong J, Song W, Cooper WJ, Jung J, Greaves J: Degradation of tetracycline antibiotics: Mechanisms and kinetic studies for advanced oxidation/reduction processes. Chemosp 2010, 78: 533–540. 10.1016/j.chemosphere.2009.11.024View ArticleGoogle Scholar
  17. Chee-Sanford JC, Aminov RI, Krapac IJ, Garrigues-Jeanjean N, Mackie RI: Occurrence and diversity of tetracycline resistance genes in lagoons and groundwater underlying two swine production facilities. Appl Environ Microbiol 2001, 67: 1494–1502. 10.1128/AEM.67.4.1494-1502.2001View ArticleGoogle Scholar
  18. Liu N, Wang MX, Liu MM, Liu F, Weng L, Koopal LK, Tan WF: Sorption of tetracycline on organo-montmorillonites. Journal of Hazardous Materi 2012, 225–226: 28–35.View ArticleGoogle Scholar
  19. Figueroa RA, Leonard A, Mackay AA: Modeling tetracycline antibiotic sorption to clays. Environ Sci Technol 2004, 38: 476–483. 10.1021/es0342087View ArticleGoogle Scholar
  20. Zhao Y, Geng J, Wang X, Gu X, Gao S: Adsorption of tetracycline onto goethite in the presence of metal cations and humic substances. J Colloid Interface Sci 2011, 361: 247–251. 10.1016/j.jcis.2011.05.051View ArticleGoogle Scholar
  21. Homem V, Santos L: Degradation and removal methods of antibiotics from aqueous matrices e A review. J Environ Mana 2011, 92: 304–2347.Google Scholar
  22. Pils JRV, Laird DA: Sorption of tetracycline and chlortetracycline on K- and Casaturated soil clays, humic substances, and clay–humic complexes. Environ Sci Technol 2007, 41(6):1928–1933. 10.1021/es062316yView ArticleGoogle Scholar
  23. Wang JT, Hu J, Zhang SW: Studies on the sorption of tetracycline onto clays and marine sediment from seawater. J Colloid Interface Sci 2010, 349(2):578–582. 10.1016/j.jcis.2010.04.081View ArticleGoogle Scholar
  24. Figueroa RA, Mackay AA: Sorption of oxytetracycline to iron oxides and iron oxide-rich soils. Environ Sci Technol 2005, 39(17):6664–6671. 10.1021/es048044lView ArticleGoogle Scholar
  25. Li Z, Chang PH, Jean JS, Jiang WT, Wang CJ: Interaction between tetracycline and smectite in aqueous solution. J Colloid Interface Sci 2010, 341: 311. 10.1016/j.jcis.2009.09.054View ArticleGoogle Scholar
  26. Chang PH, Jean JS, Jiang WT, Li ZH: Mechanism of tetracycline sorption on rectorite. Colloids and Surface A 2009, 339: 94. 10.1016/j.colsurfa.2009.02.002View ArticleGoogle Scholar
  27. Chang PH, Li ZH, Yu TL, Munkhbayer S, Kuo TH, Hung YC, Jean JS, Lin KH: Sorptive removal of tetracycline from water by palygorskite. J Hazard Mater 2009, 165: 148. 10.1016/j.jhazmat.2008.09.113View ArticleGoogle Scholar
  28. Caroni ALPF, De Lima CRM, Pereira MR, Fonseca JLC: The kinetics of adsorption of tetracycline on chitosan particles. J Colloid Interface Sci 2009, 340: 182. 10.1016/j.jcis.2009.08.016View ArticleGoogle Scholar
  29. Choi KJ, Kim SG, Kim SH: Removal of antibiotics by coagulation and granular activated carbon filtration. J Hazard Mater 2008, 151: 38. 10.1016/j.jhazmat.2007.05.059View ArticleGoogle Scholar
  30. Asgari G, Roshani B, Ghanizadeh G: The investigation of kinetic and isotherm of fluoride adsorption onto functionalize pumice Stone. J Hazard Mater 2012, 17–218: 123–132.View ArticleGoogle Scholar
  31. Akbal F: Adsorption of basic dyes from aqueous solution onto pumice powder. J Colloid Interface Sci 2005, 286: 455–458. 10.1016/j.jcis.2005.01.036View ArticleGoogle Scholar
  32. Kitis M, Kaplan SS, Karakaya E, Yigit NO, Civelekoglu G: Adsorption of natural organic matter from waters by iron coated pumice. Chemosphere 2007, 66: 130–138. 10.1016/j.chemosphere.2006.05.002View ArticleGoogle Scholar
  33. Onar AN, Ozturk B: Adsorption of phosphate onto pumice powder. Environ Technol 1993, 14: 1081–1087. 10.1080/09593339309385385View ArticleGoogle Scholar
  34. Ersoy B, Sariisik A, Dikmen S, Sariisik G: Characterization of acidic pumice and determination of its electrokinetic properties in water. Powder Technol 2010, 197: 129–135. 10.1016/j.powtec.2009.09.005View ArticleGoogle Scholar
  35. Arrigo I, Catalfamo P, Cavallari L, Di Pasquale S: Use of zeolitized pumice waste as a water softening agent. J Hazard Mater 2007, 147: 513–517. 10.1016/j.jhazmat.2007.01.061View ArticleGoogle Scholar
  36. Chuan XY, Mirano M, Inagaki M: Preparation and photocatalytic performance of anatase-mounted natural porous silica, pumice, by hydrolysis under hydrothermal conditions. Colloids and Surfaces B: Environmental 2004, 51: 255–260.Google Scholar
  37. Chang PH, Li Z, Jean JS, Jiang WT, Wang CJ, Lin KH: Adsorption of tetracycline on 2:1 layered non-swelling clay mineral illite. Applied Clay Science 2011, 67–68: 158–163.Google Scholar
  38. Chang PH, Li Z, Yu TL, Munkhbayer S, Kuo TH, Hung YC, Jean JS, Lin KH: Sorptive removal of tetracycline from water by palygorskite. J Hazard Mater 2009, 165: 48–155. 10.1016/j.jhazmat.2008.09.068View ArticleGoogle Scholar
  39. Zhao Y, Gu X, Gao S, Geng J, Wang X: Adsorption of tetracycline (TC) onto montmorillonite: Cations and humic acid effects. Geoderma 2012, 183–184: 12–18.View ArticleGoogle Scholar
  40. Stephen CK, Muraik SK, Bruningas J, Woodwarl KB: Acidity constants of tetracyline antibiotics. J Am Chem Soc 1956, 78: 4155–4158. 10.1021/ja01597a081View ArticleGoogle Scholar
  41. Qiang Z, Adams C: Potentiometric determination of acid dissociation constants (pKa) for human and veterinary antibiotics. Water Res 2004, 38: 2874–2890. 10.1016/j.watres.2004.03.017View ArticleGoogle Scholar
  42. Colaizzi JL, Klink PR: pH-partition behavior of tetracyclines. J of Pharm Sci 1969, 58: 1184. 10.1002/jps.2600581003View ArticleGoogle Scholar
  43. Dogan M, Alkan M, Türkyilmaz A, Özdemir Y: Kinetics and mechanism of removal of methylene blue by adsorption onto perlite. J Hazard Mater 2004, B109: 141–148.Google Scholar
  44. Hall KR, Eagleton LC, Acrivos A, Vermeulen T: Pore and solid diffusion kinetics in fixed-bed adsorption under constant pattern conditions. Ind Eng Chem Fundam 1966, 5: 212–223. 10.1021/i160018a011View ArticleGoogle Scholar
  45. Ho YS, McKay G: Pseudo-second order model for sorption processes. Process Biochem 1999, 34: 451–465. 10.1016/S0032-9592(98)00112-5View ArticleGoogle Scholar
  46. Murugesan A, Ravikumar L, Bala VSS, Kumar PS, Vidhyadevi T, Dinesh S, Kirupha S, Kalaivani SS, Krithiga S, Sivanesan S: Removal of Pb(II), Cu(II) and Cd(II) ions from aqueous solution using polyazomethineamides: Equilibrium and kinetic approach. Desalination 2011, 271: 199–208. 10.1016/j.desal.2010.12.029View ArticleGoogle Scholar
  47. Behnamfard A, Salarirad MM: Equilibrium and kinetic studies on free cyanide adsorption from aqueous solution by activated carbon. J Hazard Mater 2009, 170: 127–133. 10.1016/j.jhazmat.2009.04.124View ArticleGoogle Scholar
  48. Sari A, Tuzen M: Kinetic and equilibrium studies of biosorption of Pb(II) and Cd(II) from aqueous solution by macrofungus (Amanita rubescens) biomass. J Hazard Mater 2009, 164: 1004–1011. 10.1016/j.jhazmat.2008.09.002View ArticleGoogle Scholar
  49. Akar T, Kaynak Z, Ulusoy S, Yuvaci D, Ozsari G, Tunali Akar S: Enhanced biosorption of nickel(II) ions by silica-gel-immobilized waste biomass: Biosorption characteristics in batch and dynamic flow mode. J Hazard Mater 2009, 163: 1134–1141. 10.1016/j.jhazmat.2008.07.084View ArticleGoogle Scholar
  50. Dang VBH, Dogan HD, Dang-Vu T, Lohi A: Equilibrium and kinetics of biosorption of cadmium(II) and copper(II) ions by wheat straw. Bioresour Technol 2009, 100: 211–219. 10.1016/j.biortech.2008.05.031View ArticleGoogle Scholar
  51. Prado N, Ochoa J, Amrane A: Biodegradation and biosorption of tetracycline and tylosin antibiotics in activated sludge bisystem. Process Biochem 2009, 44: 1302. 10.1016/j.procbio.2009.08.006View ArticleGoogle Scholar


© Guler and Sarioglu; licensee BioMed Central Ltd. 2014

This article is published under license to BioMed Central Ltd. This is an Open Access article distributed under the terms of the Creative Commons Attribution License (, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly credited.