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1.  Adsorption of catechol from aqueous solution by aminated hypercrosslinked polymers  被引次数:1
   SUN Yue  LI Xiao-tao  XU Chao  CHEN Jin-long  LI Ai-min  ZHANG Quan-xing《Journal of environmental sciences (China)》,2005年第17卷第4期
   Adsorption of catechol from aqueous solution with the hypercrosslinked polymeric adsorbent NDA-100 and its derivatives AH-1,AH-2 and AH-3 aminated by dimethylamine, the commercial resin Amberlite XAD-4 and weakly basic anion exchanger resin D301 was compared. It was found that the aminated hypercrosslinked resins had the highest adsorption capacities among the tested polymers. The empirical Freundlich equation was successfully employed to describe the adsorption process. Specific surface area and micropore structure of the adsorbent, in company with tertiary amino groups on matrix affected the adsorption performance towards catechol. In addition, thermodynamic study was carried out to interpret the adsorption mechanism. Kinetic study testified that the tertiary amino groups on the polymer matrix could decrease the adsorption rate and increase the adsorption apparent activation energy.    

2.  Competitive and cooperative adsorption behaviors of phenol and aniline onto nonpolar macroreticular adsorbents  
   ZHANG Wei-ming  CHEN Jin-long  PAN Bing-cai  ZHANG Quan-xing《Journal of environmental sciences (China)》,2005年第17卷第4期
   The adsorption behaviors of phenol and aniline on nonpolar macroreticular adsorbents(NDA100 and Amberlite XAD4) were investigated in single or binary batch system at 293K and 313K respectively in this study. The results indicated that the adsorption isotherms of phenol and aniline on both adsorbents in both systems fitted well Langmuir equation, which indicated a favourable and exothermic process. At the lower equilibrium concentrations, the individual amount adsorbed of phenol or aniline on macroreticular adsorbents in single-component systems was higher than those in binary-component systems because of the competition between phenol and aniline towards the adsorption sites. It is noteworthy, on the contrast, that at higher concentrations, the total uptake amounts of phenol and aniline in binary-component systems were obviously larger than that in single-component systems, and a large excess was noted on the adsorbent surface at saturation, which is presumably due to the cooperative effect primarily arisen from the hydrogen bonding or weak acidbase interaction between phenol and aniline.    

3.  Adsorption of Methylene Blue on magnesium silicate: Kinetics, equilibria and comparison with other adsorbents  被引次数:1
   Franco Ferrero《环境科学学报(英文版)》,2010年第22卷第3期
   Batch adsorption from aqueous solutions in a slightly basic medium of Methylene Blue, up to 2500 mg/L, onto synthetic magnesium silicate (Florisil) of three particle size ranges (mean diameters of 112, 200 and 425 μm) was compared to the corresponding adsorption onto activated carbon and Amberlite XAD-2. The best fit of the kinetic results was achieved by a pseudo second-order equation. The equilibrium data were found to be well represented by the Langmuir isotherm equation. Amberlite XAD-2, an unspecific a...    

4.  Activated carbons derived from oil palm empty-fruit bunches: Application to environmental problems  被引次数:1
   Md. Zahangir ALAM  Suleyman A. MUYIBI  Mariatul F. MANSOR  Radziah WAHID《环境科学学报(英文版)》,2007年第19卷第1期
   Activated carbons derived from oil palm empty fruit bunches (EFB) were investigated to find the suitability of its application for removal of phenol in aqueous solution through adsorption process, Two types of activation namely; thermal activation at 300, 500 and 800℃and physical activation at 150℃ (boiling treatment) were used for the production of the activated carbons. A control (untreated EFB) was used to compare the adsorption capacity of the activated carbons produced from these processes. The results indicated that the activated carbon derived at the temperature of 800℃ showed maximum absorption capacity in the aqueous solution of phenol. Batch adsorption studies showed an equilibrium time of 6 h for the activated carbon at 800℃. It was observed that the adsorption capacity was higher at lower values of pH (2-3) and higher value of initial concentration of phenol (200-300 mg/L). The equilibrium data fitted better with the Freundlich adsorption isotherm compared to the Langmuir. Kinetic studies of phenol adsorption onto activated carbons were also studied to evaluate the adsorption rate. The estimated cost for production of activated carbon from EFB was shown in lower price (USD 0.50/kg of activated carbon) compared the activated carbon from other sources and processes.    

5.  Statistical optimization of adsorption processes for removal of 2,4-dichlorophenol by activated carbon derived from oil palm empty fruit bunches  被引次数:1
   Md. Zahangir ALAM  Suleyman A. MUYIBI  Juria TORAMAE《环境科学学报(英文版)》,2007年第19卷第6期
   The adsorption capacity of activated carbon produced from oil palm empty fruit bunches through removal of 2,4-dichlorophenol from aqueous solution was carried out in the laboratory. The activated carbon was produced by thermal activation of activation time with 30 min at 800℃. The adsorption process conditions were determined with the statistical optimization followed by central composite design. A developed polynomial model for operating conditions of adsorption process indicated that the optimum conditions for maximum adsorption of phenolic compound were: agitation rate of 100 r/min, contact time of 8 h, initial adsorbate concentration of 250 mg/L and pH 4. Adsorption isotherms were conducted to evaluate biosorption process. Langmuir isotherm was more favorable (R^2=0.93) for removal of 2,4-dichlorophenol by the activated carbon rather than Freundlich isotherm (R^2=0.88).    

6.  Removal of lead from aqueous solutions by condensed tannin gel adsorbent  
   Zhan XM  Zhao X  Miyazaki A  Nakano Y《环境科学学报(英文版)》,2003年第15卷第1期
   Lead has caused serious environmental pollution due to its toxicity, accumulation in food chains and persistence in nature.In this paper, lead removal from aqueous solutions was investigated using condensed tannin gel adsorbent synthesized from a natural tannin compound. It is found that the adsorption is strongly affected by pH values of aqueous solutions.Within pH range of 3.5-6,when initial lead concentration is 100 mg/L, removal efficiency is more than 90%.Adsorption equilibrium is reached within 150 minutes.The adsorption isotherm fits well with the Langmuir equation, by which the saturated adsorption uptake of 190 mg Pb^2 /g dry tannin gel adsorbent is obtained.By means of thermodynamics analysis,it is revealed that the process is exothermic and the adsorption heat is up to 38.4kJ/mol.With respect to high efficiency, moderate pH requirement and minimized second pollution, the tannin gel adsorbent exhibits a promising potential in the removal of lead from wastewater.    

7.  Ion adsorption components in liquid/solid systems  被引次数:6
   WU Xiao-fu  HU Yue-li  ZHAO Fang  HUANG Zhong-zix  LEI Dian《Journal of environmental sciences (China)》,2006年第18卷第6期
   Experiments on Zn^2+ and Cd^2+ adsorptions on vermiculite in aqueous solutions were conducted to investigate the widely observed adsorbent concentration effect on the traditionally defined adsorption isotherm in the adsorbate range 25--500 mg/L and adsorbent range 10--150 g/L. The results showed that the equilibrium ion adsorption density did not correspond to a unique equilibrium ion concentration in liquid phase. Three adsorbate/adsorbent ratios, the equilibrium adsorption density, the ratio of equilibrium adsorbate concentration in liquid phase to adsorbent concentration, and the ratio of initial adsorbate concentration to adsorbent concentration, were found to be related with unique values in the tested range. Based on the assumption that the equilibrium state of a liquid/solid adsorption system is determined by four mutually related components: adsorbate in liquid phase, adsorbate in solid phase, uncovered adsorption site and covered adsorption site, and that the equilibrium chemical potentials of these components should be equalized, a new model was presented for describing ion adsorption isotherm in liquid/solid systems. The proposed model fit well the experimental data obtained from the examined samples.    

8.  Synthesis of zinc-carboxylate metal-organic frameworks for the removal of emerging drug contaminant (amodiaquine) from aqueous solution  
   Adedibu C. Tell  Samson O. Owalude  Sunday J. Olatunji  Vincent O. Adimul  Sunday E. Elaigwu  Lukman O. Alimi  Peter A. Ajibade  Oluwatobi S. Oluwafemi《环境科学学报(英文版)》,2018年第64卷第2期
   We herein report the removal of amodiaquine, an emerging drug contaminant from aqueous solution using [Zn2(fum)2(bpy)] and [Zn4 O(bdc)3](fum = fumaric acid; bpy =4,4-bipyridine; bdc = benzene-1,4-dicarboxylate) metal–organic frameworks(MOFs) as adsorbents. The adsorbents were characterized by elemental analysis, Fourier transform infrared(FT-IR) spectroscopy, and powder X-ray diffraction(PXRD). Adsorption process for both adsorbents were found to follow the pseudo-first-order kinetics, and the adsorption equilibrium data fitted best into the Freundlich isotherm with the R~2 values of 0.973 and0.993 obtained for [Zn_2(fum)_2(bpy)] and [Zn_4 O(bdc)_3] respectively. The maximum adsorption capacities foramodiaquine in this study were found to be 0.478 and 47.62 mg/g on the[Zn_2(fum)_2(bpy)] and [Zn_4 O(bdc)_3] MOFs respectively, and were obtained at p H of 4.3 for both adsorbents. FT-IR spectroscopy analysis of the MOFs after the adsorption process showed the presence of the drug. The results of the study showed that the prepared MOFs could be used for the removal of amodiaquine from wastewater.    

9.  Removal of Pb(Ⅱ) from aqueous solutions using waste textiles/poly(acrylic acid) composite synthesized by radical polymerization technique  
   Tao Zhou  Fafa Xi  Yue Deng  Youcai Zhao《环境科学学报(英文版)》,2018年第67卷第5期
   Waste textiles(WTs) are the inevitable outcome of human activity and should be separated and recycled in view of sustainable development. In this work, WT was modified through grafting with acrylic acid(AA) via radical polymerization process using ceric ammonium nitrate(CAN) as an initiator and microwave and/or UV irradiation as energy supply. The acrylic acid-grafted waste textiles(WT-g-AA) thus obtained was then used as an adsorbent to remove Pb(Ⅱ) from Pb(Ⅱ)-containing wastewater. The effects of p H, initial concentrations of Pb(Ⅱ) and adsorbent dose were investigated, and around 95% Pb(Ⅱ) can be removed from the aqueous solution containing 10 mg/L at p H 6.0–8.0. The experimental adsorption isotherm data was fitted to the Langmuir model with maximum adsorption capacity of35.7 mg Pb/g WT-g-AA. The Pb-absorbed WT-g-AA was stripped using dilute nitric acid solution and the adsorption capacity of Pb-free material decreased from 95.4%(cycle 1) to91.1%(cycle 3). It was considered that the WT-g-AA adsorption for Pb(Ⅱ) may be realized through the ion-exchange mechanism between \COOH and Pb(Ⅱ). The promising results manifested that WT-g-AA powder was an efficient, eco-friendly and reusable adsorbent for the removal of Pb(Ⅱ) from wastewater.    

10.  Factors influencing antibiotics adsorption onto engineered adsorbents  
   Mingfang Xi  Aimin Li  Zhaolian Zhu  Qin Zhou  Weiben Yang《环境科学学报(英文版)》,2013年第25卷第7期
   The study evaluated the adsorption of two antibiotics by four engineered adsorbents (hypercrosslinked resin MN-202, macroporous resin XAD-4, activated carbon F-400, and multi-walled carbon nanotubes (MWCNT)) from aqueous solutions. The dynamic results demonstrated the dominant influence of pore size in adsorption. The adsorption amounts of antibiotics on XAD-4 were attributed to the hydrophobic effect, whereas steric hindrance or micropore-filling played a main role in the adsorption of antibiotics by F-400 because of its high microporosity. Aside from F-400, similar patterns of pH-dependent adsorption were observed, implying the importance of antibiotic molecular forms to the adsorption process for adsorbents. Increasing the ionic concentration with CaCl2 produced particular adsorption characteristics on MWCNT at pH 2.0 and F-400 at pH 8.0, which were attributed to the highly available contact surfaces and molecular sieving, respectively. Its hybrid characteristics incorporating a considerable portion of mesopores and micropores made hypercross linked MN-202 a superior antibiotic adsorbent with high adsorption capacity. Furthermore, the adsorption capacity of MWCNT on the basis of surface area was more advantageous than that of the other adsorbents because MWCNT has a much more compact molecular arrangement.    

11.  Adsorption characteristics of humic acid-immobilized amine modifiedpolyacrylamide/bentonite composite for cationic dyesin aqueous solutions  
   T. S. Anirudhan  P. S. Suchithra《环境科学学报(英文版)》,2009年第21卷第7期
   Humic acid-immobilized amine modified polyacrylamide/bentonite composite (HA-Am-PAA-B) was prepared and used as anadsorbent for the adsorption of cationic dyes (Malachite Green (MG), Methylene Blue (MB) and Crystal Violet (CV)) from aqueoussolutions. The polyacrylamide/bentonite composite (PAA-B) was prepared by intercalative polymerization of acrylamide with Nabentonitein the presence of N,N0-methylenebisacrylamide as a crosslinking agent and hexamethylenediammine as propagater. PAA-Bwas subsequently treated with ethylenediammine to increase its loading capacity for HA. The surface characterizations of the adsorbentwere investigated. The adsorbent behaved like a cation exchanger and more than 99.0% removal of dyes was detected at pH range6.0–8.0. The capacity of HA-Am-PAA-B was found to decrease in the following order: MG > MB > CV. The kinetic and isothermdata were interpreted by pseudo-second order rate equation and Freundlich isotherm model, respectively. Experiments were carriedout using binary solute systems to assess the competitive adsorption phenomenon. The experimental isotherm data for each binarysolute combination of MG, MB and CV were analyzed using Sheindrof-Rebhun-Sheintuch (SRS) (multicomponent Freundlich type)equation.    

12.  Removal of phenol by activated carbons prepared from palm oil mill effluent sludge  被引次数:3
   Md. Zahangir ALAM  Suleyman A. MUYIBI  Mariatul F.MANSOR  Radziah WAHID《Journal of environmental sciences (China)》,2006年第18卷第3期
   The study was attempted to produce activated carbons from palm oil mill effluent (POME) sludge. The adsorption capacity of the activated carbons produced was evaluated in aqueous solution of phenol. Two types of activation were followed, namely, thermal activation at 300, 500 and 800%, and physical activation at 150% (boiling treatment). A control (raw POME sludge) was used to compare the adsorption capacity of the activated carbons produced. The results indicated that the activation temperature of 800℃ showed maximum absorption capacity by the activated carbon (POME 800) in aqueous solution of phenol. Batch adsorption studies showed an equilibrium time of 6 h for the activated carbon of POME 800. It was observed that the adsorption capacity was higher at lower values ofpH (2--3) and higher value of initial concentration of phenol (200--300 mg/L), The equilibrium data were fitted by the Langmuir and Freundlich adsorption isotherms. The adsorption of phenol onto the activated carbon POME 800 was studied in terms of pseudo-first and second order kinetics to predict the rate constant and equilibrium capacity with the effect of initial phenol concentrations. The rate of adsorption was found to be better correlation for the pseudo-second order kinetics compared to the first order kinetics.    

13.  Preparation and utilization of wheat straw anionic sorbent for the removal of nitrate from aqueous solution  被引次数:1
   WANG Yu  GAO Bao-yu  YUE Wen-wen  YUE Qin-yan《环境科学学报(英文版)》,2007年第19卷第11期
   In order to reduce the impact of eutrophication caused by agricultural residues(i.e.,excess nitrate)in aqueous solution,economic and effective anionic sorbents are required.In this article,we prepared anionic sorbent using wheat straw.Its structural characteristics and adsorption properties for nitrate removal from aqueous solution were investigated.The results indicate that the yield of the prepared anionic sorbent,the total exchange capacity,and the maximum adsorption capacity were 350%,2.57 mEq/g,and 2.08 mmol/g, respectively.The Freundlich isotherm mode is more suitable than the Langmuir mode and the adsorption process accords with the first order reaction kinetic rate equation.When multiple anions(SO_4~(2-),H_2PO_4~-,NO_3~-,and NO_2~-)were present,the isotherm mode of prepared anionic sorbent for nitrate was consistent with Freundlich mode;however,the capacity of nitrate adsorption was reduced by 50%.In alkaline solutions,about 90% of adsorbed nitrate ions could be desorbed from prepared anionic sorbent.The results of this study confirmed that the wheat straw anionic sorbent can be used as an excellent nitrate sorbent that removes nitrate from aqueous solutions.    

14.  Removal of tetracycline from aqueous solution by a Fe3O4 incorporated PAN electrospun nanofiber mat  
   Qing Liu  Yuming Zheng  Lubin Zhong  Xiaoxia Cheng《环境科学学报(英文版)》,2015年第28卷第2期
   Pollution of antibiotics, a type of emerging contaminant, has become an issue of concern,due to their overuse in human and veterinary application, persistence in environment and great potential risk to human and animal health even at trace level. In this work, a novel adsorbent, Fe3O4 incorporated polyacrylonitrile nanofiber mat(Fe-NFM), was successfully fabricated via electrospinning and solvothermal method, targeting to remove tetracycline(TC), a typical class of antibiotics, from aqueous solution. Field emission scanning electron microscopy and X-ray diffraction spectroscopy were used to characterize the surface morphology and crystal structure of the Fe-NFM, and demonstrated that Fe-NFM was composed of continuous, randomly distributed uniform nanofibers with surface coating of Fe3O4 nanoparticles. A series of adsorption experiments were carried out to evaluate the removal efficiency of TC by the Fe-NFM. The pseudo-second-order kinetics model fitted better with the experimental data. The highest adsorption capacity was observed at initial solution p H 4 while relative high adsorption performance was obtained from initial solution p H 4 to 10. The adsorption of TC on Fe-NFM was a combination effect of both electrostatic interaction and complexation between TC and Fe-NFM. Freundlich isotherm model could better describe the adsorption isotherm. The maximum adsorption capacity calculated from Langmuir isotherm model was 315.31 mg/g. Compared to conventional nanoparticle adsorbents which have difficulties in downstream separation, the novel nanofiber mat can be simply installed as a modular compartment and easily separated from the aqueous medium, promising its huge potential in drinking and wastewater treatment for micro-pollutant removal.    

15.  Selective adsorption of silver ions from aqueous solution using polystyrene-supported trimercaptotriazine resin  
   Shiming Wang  Hongling Li  Xiaoya Chen  Min Yang  Yanxing Qi《环境科学学报(英文版)》,2012年第24卷第12期
   Trimercaptotriazine-functionalized polystyrene chelating resin was prepared and employed for the adsorption of Ag(I) from aqueous solution. The adsorbent was characterized according to the following techniques: Fourier transform infrared spectroscopy, elemental analysis, scanning electron microscopy and the Brunauer-Emmet-Teller method. The effects of initial Ag(I) concentration, contact time, solution pH and coexisting ions on the adsorption capacity of Ag(I) were systematically investigated. The maximum adsorption capacity of Ag(I) was up to 187.1 mg/g resin at pH 0.0 and room temperature. The kinetic experiments indicated that the adsorption rate of Ag(I) onto the chelating resin was quite fast in the first 60 min and reached adsorption equilibrium after 360 min. The adsorption process can be well described by the pseudo second-order kinetic model and the equilibrium adsorption isotherm was closely fitted by the Langmuir model. Moreover, the chelating resin could selectively adsorb more Ag(I) ions than other heavy metal ions including: Cu(II), Zn(II), Ni(II), Pb(II) and Cr(III) during competitive adsorption in the binary metal species systems, which indicated that it was a highly selective adsorbent of Ag(I) from aqueous solution.    

16.  Removal of Methyl Violet from aqueous solutions using poly (acrylic acid.co-acrylamide)/attapulgite composite  被引次数:3
   Yongsheng Wang  Li Zeng  Xuefeng Ren  Hai Song  Aiqin Wang《环境科学学报(英文版)》,2010年第22卷第1期
   The adsorption of Methyl Violet (MV) cationic dye from aqueous solution was carried out by using crosslinked poly (acrylic acid-co-acrylamide)/attapulgite (Poly(AA-co-AM)/ATP) composite as the adsorbent. The factors influencing adsorption capacity of the composite such as pH, concentration of the dye, temperature, contact time, adsorbent dosage, ionic strength and surfactant were systematically investigated. The equilibrium data fitted very well to the Langmuir isotherm and the maximum adsorption capacity reached 1194 mg/g at 30℃. The thermodynamic parameters including ΔG~0, ΔH~0 and ΔS~0 for the adsorption processes of MV on the composite were also calculated, and the negative ΔH~0 and ΔG~0 confirmed that the adsorption process was exothermic and spontaneous. The kinetic studies showed that the adsorption process was consistent with the pseudo second-order kinetic model and the desorption studies revealed that the regeneration of the composite adsorbent can be easily achieved.    

17.  Sequestration of toxic Pb(II) ions by chemically treated rubber (Hevea brasiliensis ) leaf powder  
   Megat Hanafiah Megat Ahmad Kamal  Wan Mat Khalir Wan Khaima Azir  MohamedKasmawati  Zakaria Haslizaidi  Wan Ngah Wan Saime《环境科学学报(英文版)》,2010年第22卷第2期
   Rubber leaf powder (an agricultural waste) was treated with potassium permanganate followed by sodium carbonate and itsperformance in the removal of Pb(II) ions from aqueous solution was evaluated. The interactions between Pb(II) ions and functionalgroups on the adsorbent surface were confirmed by Fourier transform infrared (FT-IR) spectroscopy, scanning electron microscopy(SEM) coupled with X-ray energy dispersive spectroscopy (EDX). The effects of several important parameters which can affectadsorption capacity such as pH, adsorbent dosage, initial lead concentration and contact time were studied. The optimum pH rangefor lead adsorption was 4–5. Even at very low adsorbent dosage of 0.02 g, almost 100% of Pb(II) ions (23 mg/L) could be removed.The adsorption capacity was also dependent on lead concentration and contact time, and relatively a short period of time (60–90min) was required to reach equilibrium. The equilibrium data were analyzed with Langmuir, Freundlich and Dubinin-Radushkevichisotherms. Based on Langmuir model, the maximum adsorption capacity of lead was 95.3 mg/g. Three kinetic models including pseudofirst-order, pseudo second-order and Boyd were used to analyze the lead adsorption process, and the results showed that the pseudosecond-order fitted well with correlation coefficients greater than 0.99.    

18.  Removal efficiency of fluoride by novel Mg-Cr-Cl layered double hydroxide by batch process from water  被引次数:1
   Sandip Mandal  Swagatika Tripathy  Tapswani Padhi  Manoj Kumar Sahu  Raj Kishore Patel《环境科学学报(英文版)》,2013年第25卷第5期
   The fluoride ion removal from aqueous solution using synthesized Mg-Cr-Cl layered double hydroxide has been reported.Mg-Cr-Cl was characterized by X-ray powder diffraction,Fourier-transform infrared,thermo-gravimetric analysis,differential thermal analysis,and scanning electron microscope.Adsorption experiments were carried out in batch mode as a function of adsorption dosages,contact time,pH,and initial fluoride concentration to get optimum adsorption capacity.The adsorption kinetic study showed that the adsorption process followed first order kinetics.The fluoride removal was 88.5% and 77.4% at pH 7 with an adsorbent dose of 0.6 g/100 mL solution and initial fluoride concentration of 10 mg/L and 100 mg/L,respectively.The equilibrium was established at 40 min.Adsorption experiment data were fitted well with Langmuir isotherm with R 2 = 0.9924.Thermodynamic constants were also measured and concluded that the adsorption process was spontaneous and endothermic in nature.The removal percentage decreased slowly with increasing pH.This process is suitable for industrial effluents.The regeneration of the material is not possible.    

19.  Adsorption thermodynamics and kinetic investigation of aromatic amphoteric compounds onto different polymeric adsorbents  
   WANG Hai-ling  FEI Zheng-hao  CHEN Jin-long  ZHANG Quan-xing  XU Yan-hua《环境科学学报(英文版)》,2007年第19卷第11期
   The adsorption behavior of p-aminobenzoic acid and o-aminobenzoic acid onto the different polymeric adsorbents was systematically investigated as a function of the solution concentration and temperature.Experimental results indicated that the equilibrium adsorption data of the four polymeric adsorbents fitted well in the Freundlich isotherm.The adsorption capacity of multi-functional polymeric adsorbent NJ-99 was the highest,which might be attributed to the strong hydrogen-bonding interaction between the amino groups on the resin and the carboxyl group of aminobenzoic acid.The adsorption capacity of o-aminobenzoic acid onto any adsorbent was higher than p-aminobenzoic acid.Thermodynamic studies suggested the exothermic,spontaneous physical adsorption process.Adsorption kinetics results showed that the adsorption followed the pseudo-second-order kinetics model and the intraparticle mass transfer process was the rate-controlling step.    

20.  Biosorption of Cu(II) on extracellular polymers from Bacillus sp. F19  
   ZHENG Yan  FANG Xuliang  YE Zhilong  LI Yahong  CAI weimin《环境科学学报(英文版)》,2008年第20卷第11期
   Biosorption can be an effective process for the removal of heavy metals from aqueous solutions. The adsorption of Cu(Ⅱ) from aqueous solution on the extracellular polymers (EPS) from Bacillus sp. (named MBFF19) with respect to pH, incubation time,concentration of initial Cu(Ⅱ), and biosorbent dose was studied. Biosorption of Cu(Ⅱ) is highly pH dependent. The maximum uptake of Cu(Ⅱ) (89.62 mg/g) was obtained at pH 4.8. Biosorption equilibrium was established in approximately 10 min. The correlation coefficient of more than 0.90 turned out that the adsorption process of Cu(Ⅱ) on MBFF19 was in accordance with both Langmuir and Freundlich isotherms. The pseudo-first and second order models were applied to examine the kinetics of the adsorption, whereas the latter was found to be in harmony with the kinetic data better. Because of the outstanding uptake capacity of Cu(Ⅱ), MBFF19 produced by Bacillus sp. was proved to be an excellent biosorbent for removing Cu(Ⅱ) from aqueous solutions.    

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