Biosorption of copper(II) and zinc(II) from aqueous solution by Pseudomonas putida CZ1.
To study Pseudomonas putida CZ1, having high tolerance to copper and zinc on the removal of toxic metals from aqueous solutions, the biosorption of Cu(II) and Zn(II) by living and nonliving P. putida CZ1 were studied as functions of reaction time, initial pH of the solution and metal concentration. It was found that the optimum pH for Zn(II) removal by living and nonliving cells was 5.0, while it was 5.0 and 4.5, respectively, for Cu(II) removal. At the optimal conditions, metal ion biosorption was increased as the initial metal concentration increased. The adsorption data with respect to both metals provide an excellent fit to the Langmuir isotherm. The binding capacity of living cells is significantly higher than that of nonliving cells at tested conditions. It demonstrated that about 40-50% of the metals were actively taken up by P. putida CZ1, with the remainder being passively bound to the bacterium. Moreover, desorption efficiency of Cu(II) and Zn(II) by living cells was 72.5 and 45.6% under 0.1M HCl and it was 95.3 and 83.8% by nonliving cells, respectively. It may be due to Cu(II) and Zn(II) uptake by the living cells enhanced by intracellular accumulation.
Chen
Xin Cai
XC
Department of Environmental Engineering, Zhejiang University, Hangzhou 310029, China.
Wang
Yuan Peng
YP
Lin
Qi
Q
Shi
Ji Yan
JY
Wu
Wei Xiang
WX
Chen
Ying Xu
YX
D000327:Adsorption; D003300:Copper / Q000493:pharmacokinetics*; D019327:Copper Sulfate / Q000378:metabolism; D006863:Hydrogen-Ion Concentration; D009566:Nitrates / Q000378:metabolism; D016958:Pseudomonas putida / Q000254:growth & development / Q000378:metabolism*; D018508:Water Purification / Q000379:methods; D015032:Zinc / Q000493:pharmacokinetics*; D017967:Zinc Compounds / Q000378:metabolism
D009566:Nitrates; D017967:Zinc Compounds; D003300:Copper; C042103:zinc nitrate; D015032:Zinc; D019327:Copper Sulfate