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.
出处
《环境工程学报》
CAS
CSCD
北大核心
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
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
zinc
decabromodiphenyl ether
Stenotrophomonas maltophilia
biosorption
combined pollution
