改性硅藻土吸附废水中Cd^(2+)的动力学研究  

Kinetics Study on the Adsorption of Cd^(2+) in Wastewater by Modified Diatomite

作　　者：凌静[1] 何少华[1] 夏勇锋[1] 林振波[1] 

机构地区：[1]南华大学城市建设学院,湖南衡阳421001

出　　处：《山东化工》2012年第7期11-14,共4页Shandong Chemical Industry

摘　　要：用十二烷基磺酸钠对天然硅藻土进行改性,改性后硅藻土的吸附效果明显优于天然硅藻土,吸附量由4.973mg/g增加到17.045mg/g。通过静态吸附实验探讨了改性硅藻土对废水中Cd2+的吸附主要影响因素和动力学。在本实验条件下,吸附量随温度与Cd2+浓度的增加而增加,但随改性硅藻土用量的增加而减少。在pH值为3～6时,吸附量随pH值的增加而增加。吸附动力学符合Lagergren准二级方程。Natural diatomite was modified by twelve sodium dodecyl sulfate and the adsorption effects of modified diatomite were better than natural diatomite. The adsorption quantity from 4.973mg/g increased to 17. 045mg/g. The mainly affecting factors and the kinetics hade been investigated under through batch experinents of adsorbing Cd2＋ in wastewater by modified diatomite. Under the experiment conditions, the adsorption capacity was increased with the increasing temperature and the Cd2 ＋ initial concentration. But the adsorption capacity was decreased with the increasing amounts of modified diatomite. When pH was between 3 and 6, the adsorption capacity was increasd with increasing pH. The adsorption kinetics fitted well to the Lagergren psedo -second order equation.

关 键 词：十二烷基磺酸钠改性硅藻土 Cd2+ 吸附 

分 类 号：X703[环境科学与工程—环境工程]