中文摘要：

采用原位沉积技术将Fe（Ⅲ）负载于铜绿假单胞菌（Pseudomonas aeruginosa,简称Pa）表面制备了Fe（Ⅲ）与细菌的复合体（Fe-Pa）,研究了Fe-Pa对水溶液中Cr（Ⅵ）的吸附特性,探讨了最佳合成条件、Fe-Pa投加量、溶液pH值、时间和Cr（Ⅵ）初始浓度等因素对Cr（Ⅵ）吸附效果的影响,同时利用SEM、FT-IR、XPS和Zeta电位对Fe-Pa进行表征分析.吸附实验结果显示,Fe（Ⅲ）浓度为600 mg·L^-1、细菌投加量为0.5 g·L^-1制备的Fe-Pa效果最佳;Fe-Pa去除Cr（Ⅵ）适宜于酸性条件进行;Fe-Pa对Cr（Ⅵ）的吸附速率较快,60 min内可达到吸附平衡,为自发的吸热吸附,且符合准二级动力学和Langmuir等温模型.表征结果表明,Fe（Ⅲ）成功地负载到铜绿假单胞菌上,为吸附Cr（Ⅵ）提供更多的活性位点,主要机制为静电吸附作用、络合作用和还原作用.经过4次吸附/再生后,Fe-Pa对Cr（Ⅵ）的吸附能力仍在72%以上,表明Fe-Pa具有较好的重复使用性.

英文摘要：

Pseudomonas aeruginosa was pretreated with Fe（ Ⅲ） solution to form a biosorbent named as Fe-Pa. The adsorption behavior characteristics of Cr（ Ⅵ） onto Fe-Pa in aqueous solution were investigated by evaluating optimum synthesis conditions,the efffects of biomass dosage,pH value,contact time and initial concentration of Cr（ Ⅵ）. The physico-chemical properties of Fe-Pa were performed by using Scanning electronic microscopy（ SEM）,Fourier transform infrared spectroscopy（ FTIR）,X-ray photoelectron spectroscopy（ XPS） and Zeta potential. The best preparation condition of Fe-Pa was under Fe（ Ⅲ） concentration of 600 mg·L^-1with P. aeruginosa dosage of 0.5 g·L^-1. The lower pH was more benefit for Cr（ Ⅵ） adsorption onto Fe-Pa.Cr（ Ⅵ） adsorption was a endothermic and spontaneous process and could reach equilibrium within 60 min. Pseudo-second-order kinetics model and Langmuir adsorption model fitted the experimental data well. Fe（ Ⅲ） was successfully loaded onto the surface of Pseudomonas aeruginosa,which provided a large number of activated sites for the adsorption of Cr（ Ⅵ）. Electrostatic interactions and surface complexation were inferred to be the main mechanisms of adsorption of Cr（ Ⅵ） on Fe-Pa. After 4 times of adsorption/regeneration test,the maximum removal efficiency of Cr（ Ⅵ） could maintain 72%,which indicates that Fe-Pa had an excellent reusability.