硫脲修饰啤酒废酵母吸附Hg^(2+)的性能  

Adsorption Behavior of Waste Beer′s Yeast Modified by Thiourea for Hg^(2+)

作　　者：黄冰[1] 孙小梅[1] 李步海[1] 

机构地区：[1]中南民族大学化学与材料科学学院分析化学国家民委重点实验室,湖北武汉430074

出　　处：《化学与生物工程》2010年第1期23-26,共4页Chemistry & Bioengineering

基　　金：国家民委院校科研基金资助项目(MJY00004)

摘　　要：以戊二醛为交联剂,将硫脲修饰到啤酒废酵母菌上,合成了一种新型吸附剂。用电子显微镜、红外光谱以及光电子能谱对菌体的结构进行了表征。考察了交联剂用量、溶液pH值、金属离子初始浓度、吸附时间等对菌体吸附Hg2+的影响。结果表明,25℃时,修饰菌在pH值1.5条件下吸附60 min,对Hg2+的饱和吸附容量为58.9 mg.g-1,吸附过程符合准二级方程,吸附为Langmuir单分子层化学吸附。用该吸附剂处理加标准汞的自来水样,平均Hg2+吸附率为71.4%。Waste beer＇s yeast cross-linked with glutaraldehyde and modified by thiourea was prepared. Electron microscope, FTIR and X-ray photoelectron spectroscopy were used to characterize the modified biomass. The adsorption capability of the modified biomass for Hg^2＋ in aqueous solution was studied. The optimized pH value was 1.5, and the adsorption process could be completed for 60 min at 25℃. The adsorption capacity of the modified biomass was 58.9 mg · g^-1. The adsorption process followed the pseudo second-order kinetics; and the adsorption behavior was fitted Langmuir isotherm. The modified biomass and the pristine biomass were used to treat tap water added Hg^2＋ , the result showed that the modified biomass and the pristine biomass average adsorption rate for Hg^2＋ were 71.4% and 28. 2%, respectively.

关 键 词：硫脲 啤酒废酵母菌 修饰 Hg2+ 吸附 

分 类 号：X703.1[环境科学与工程—环境工程]