Pb~(2+) 在天然膨润土上的吸附动力学研究.pdf

文档介绍：11 1
2010年第 4期水科学与工程技术·37·
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Pb2+在天然膨润土上的吸附动力学研究
李昕,何少华,邝应林,司建伟,张宇
(南华大学城市建设学院,湖南衡阳 421001)
摘要:采用静态法探讨了天然膨润土吸附废水中Pb“的主要影响因素及动力学。研究表明,在实验条件下,当天然膨润土用量增加
时,吸附量随之减少。而当初始 pH值在 4~6变化时,吸附量随着 pH值的增大而增加。此外,当温度或 Pb
之增大。由于反应速度较快,吸附 60rain后基本达到平衡,吸附 90rain后天然膨润土对 Pb“的吸附量为 ~。吸附动力学规
律遵从 Lagergren准二级反应模型。
关键词:天然膨润土;铅;吸附;动力学
中图分类号:TU43 文献标识码:A 文章编号:1672—9900(2010)04—0037—03
Studyon the ics characteristics of Pb on natural bentonite
LI Xin,HE Shao—hua,KUANG Ying—lin,SI Jian—wei,ZHANGYu
(School of urban construction,University ofSouth China,Hengyang421001,China) construction,University urban of (School
Abstract:Through batch experiments,wenvestigated i the use ofnatural bentonite in treating the adsorption of Pb in
aqueous solutions,including the mainly affectingfactors and the experiment conditions,the adsorption
capacity was decreased with the increasing amounts ofnatural hen pH was between4 and 6,the adsorption
capacitywas increased with the increasing ,the adsorptioncapacity increased with the increasing temperature
and thePb initial ofthe rapid adsorption adsorption process approximately reached e—
quilibrium in 60min and the adsorption capacity ofPb was ~ adsorption ics fitted
wellthe