锰氧化物改性硅藻土吸附Pb^(2+)特性的研究  

Studies on characteristics of adsorption Pb^(2+) of modif ied diatomite by manganese oxide

作　　者：罗文连[1] 吴晓芙[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》2013年第11期134-138,共5页Journal of Central South University of Forestry & Technology

基　　金：湖南省环境科学重点学科建设基金项目(2006180)

摘　　要：采用锰氧化物改性硅藻土并应用于处理含Pb2+模拟废水,研究了改性硅藻土用量、吸附时间、废水中污染物浓度和pH值对改性硅藻土吸附Pb2+的影响,研究了其吸附等温式和吸附动力学。结果表明:随着投加量的减少,离子初始浓度提高,pH值的增大,吸附时间延长,硅藻土对Pb2+吸附量增大;改性硅藻土对Pb2+的等温吸附符合Langmuir模型;改性硅藻土对Pb2+的吸附动力学模型可以很好的与双常数扩散方程吻合。Pb^2＋ simulation wastewater was treated by employing diatomite modified with the manganese oxide. The effects of use amount of modified diatomite, adsorption time, pollutant concentrations and pH value in wastewater on adsorption efficiency of Pb^2＋ with modified diatomaceous earth were investigated. And the adsorption isotherm and adsorption kinetics mechanism of the modified diatomite were studied. The results show that adsorption quantity of modified diatomite to Pb^2＋ enlarged with the decrease of diatomite dose and the increase of Pb^2＋ initial concentration, pH and trial time; Adsorption isotherms of modified diatomite to Pb^2＋ were in complete accord with that drawn with Langmuir model; Adsorption kinetics models of modified diatomite to Pb^2＋ fitted with the two- constant diffusion equation very well.

关 键 词：改性硅藻土 锰氧化物 吸附时间 PB^2+ 模拟废水 

分 类 号：S719[农业科学—林学]