十溴联苯醚共存条件下水中Zn(Ⅱ)的生物吸附  

Biosorption of zinc(Ⅱ) in water with decabromodiphenyl ethers

作　　者：白洁琼[1] 尹华[2] 叶锦韶[1] 彭辉[1] 叶芊[1] 何宝燕[1] 李跃鹏[1] 张娜[1] 彭素芬[1] 

机构地区：[1]暨南大学环境工程系广东省高校水土环境毒害性污染物防治与生物修复重点实验室,广州510632 [2]华南理工大学环境科学与工程学院,工业聚集区污染控制与生态修复教育部重点实验室,广州510006

出　　处：《环境工程学报》2013年第4期1245-1250,共6页Chinese Journal of Environmental Engineering

基　　金：国家自然科学基金-广东省联合基金重点项目(U0933002);国家自然科学基金资助项目(50978122);暨南大学优秀本科推免生科研创新培育计划项目

摘　　要：研究了十溴联苯醚(BDE-209)共存条件下嗜麦芽窄食单胞菌对水中Zn2+的吸附特性,并通过对菌体进行失活处理、红外光谱和X-光电子能谱分析,探讨了吸附机理。结果表明,Zn2+的吸附符合Freundlich吸附模式;嗜麦芽窄食单胞菌对Zn2+吸附作用明显,2.5 g/L菌体在2 h时,对初始浓度为2.0 mg/L Zn2+的去除率达92%。BDE-209对菌体吸附Zn2+有一定的抑制作用。各因素对嗜麦芽窄食单胞菌吸附Zn2+的影响程度由大到小依次为:投菌量>pH>BDE-209浓度。菌体对Zn2+的吸附除表面吸附外,还存在跨细胞壁细胞膜的主动运输和积累等作用。菌体中的酰胺基与羟基均参与了Zn2+吸附,而且菌体表面Ca2+与Zn2+发生了离子交换,吸附后Zn2+的价态不变。The characteristics of Zn2＋ biosorption by Stenotrophomonas maltophilia in the presence of decabromodiphenyl ether （BDE-209） were studied and its mechanisms were explored through cell inactivation, fourier transform infrared spectroscopy observation and X-ray photoelectron spectroscopy analysis. Freundlich adsorption isotherms fitted well to describe Zn2＋ biosorption behavior. S. maltophilia was an effective strain to remove more than 90% of Zn2＋ after dealing with 2.0 mg/L Zn2＋ solution for 2 h with 2.5 g/L biomass. However, BDE-209 had an inhibitory effect on Zn2＋ biosorption. The sequence of factors influencing Zn2~ biosorption was biomass 〉 pH 〉 concentration of BDE-209. Zn2 ＋ biosorption by S. maltophilia included surface adsorption, transmembrane active transport and bioaccumulation. The mechanism study clarified acetyl amino group and hydroxyl group binded Zn2＋ , Ca2. on the cell wall exchanged with Zn2＋. Moreover, the valence state of Zn2＋ was not changed by biosorption.

关 键 词：锌 十溴联苯醚 嗜麦芽窄食单胞菌 微生物吸附 复合污染 

分 类 号：X172[环境科学与工程—环境科学]