硅藻土对重金属离子Mn^(2+)的吸附研究  

Research on adsorption of diatomite to heavy metal ion Mn^(2+)

作　　者：张伟丽[1] 朱健 王平[1] 雷明婧[1] 苏扬[1] 

机构地区：[1]中南林业科技大学环境科学与工程研究中心,湖南长沙410004

出　　处：《中南林业科技大学学报》2012年第12期72-77,共6页Journal of Central South University of Forestry & Technology

基　　金：湖南省自然科学省市联合基金重点项目(12JJ8016);湖南省研究生科研创新项目(CX2012B317);环保公益性行业科研专项(200909066);湖南省环境科学重点学科建设基金资助项目(2006180)

摘　　要：以硅藻土为吸附剂,采用静态吸附试验考查了吸附剂浓度、离子初始浓度、吸附质溶液温度、吸附质溶液初始pH值、时间等因素对硅藻土吸附模拟废水中Mn2+的影响。研究表明,硅藻土对Mn2+的最大吸附量可达到4.0486 mg·g-1,效果较好,可被用于去除重金属锰。适当增加吸附剂用量、离子初始浓度、控制吸附温度(<50)、pH值(<6)、延长吸附时间都能提高硅藻土对Mn2+的吸附效果。Langmuir吸附等温式相比Freundlich吸附等温式能更好的描述硅藻土对Mn2+的吸附过程。硅藻土吸附Mn2+的吸附动力学则符合二级动力学方程。Using diatomite as an adsorbent, the effects of several factors, including adsorbent concentration, initial iron concentration, adsorbate-solution temperature, initial adsorbate-solution pH value and adsorption time on diatomite adsorption to the Mn^2＋ in the simulated waste-water were examined in the experiment by static adsorption tentative. The results indicate that the maximum diatomite adsorption capacity to Mn^2＋ was 4.0486 mg·g^-1,so the diatomite adsorbent can be used for the removal of the Mn^2＋ iron. Further, under the conditions of temperature lower than 50℃ and the pH value less than 6, the performance of diatomite adsorption to Mn^2＋ could be improved with the increases of adsorbent dosage, initial Mn^2＋ concentration and adsorption time. The findings also demonstrate that, compared to the Langmuir adsorption isotherms, Freundlich adsorption isotherm can better describe the adsorption process of diatomite to Mn^2＋, and that adsorption kinetic of diatomite to Mn^2＋ accorded with second-order equation.

关 键 词：硅藻土 吸附 Mn2+ 吸附等温式 吸附动力学 

分 类 号：S719[农业科学—林学] X522[环境科学与工程—环境工程]