摘要
通过吸附实验和微量滴定法探讨了Pb2 +与蜡状芽孢杆菌Bacilluscereus的吸附特性 .结果表明 ,该菌体对Pb2 +的吸附量随着 pH升高而升高 ,最适 pH值为 6 ;菌体浓度的增加有利于对Pb2 +的吸附 ;整个吸附过程符合Langmuir吸附模型 ,在试验的条件下 ,对Pb2 +的饱和吸附容量为 36 7mg/ g干菌体 .通过电位滴定实验 ,使用实时格氏图确定了滴定体系中的等当点(Ve)以及估算了表面活性位的总浓度 (HS) .
In this paper, the potentiometric titration and the sorption experiments were applied to investigate the biosorption behavior of Pb 2+ on Bacillus cereus biomass. It was shown that the biosorption capacities increased with increasing pH from 3 to 7, and the higher concentration of the biomass in solution was favorable to the sorption of Pb 2+ . Langmuir model simulated the adsorption data of Pb 2+ ion very well, and the saturated sorption capacity for Pb 2+ ion achieved 36 7mg·g -1 dry biomass. According to the result of the potentiometric titration, the Gran plots for the hydroxide back titration of biomass suspension systems were utilized to derive the specific volume of titrant at the equivalence point ( V e), furthermore, the total surface site concentration was calculated.
出处
《环境科学》
EI
CAS
CSCD
北大核心
2004年第2期166-169,共4页
Environmental Science
基金
国家自然科学基金资助项目 (2 0 1770 2 7
2 0 0 3 70 10 )
香港研究基金会 (PolyU5 0 0 1/OOE)资助项目
