合成Schwertmannite矿物对镉离子的吸附行为  

Adsorption Behaviors of Cadmium Ion on Schwertmannite

作　　者：赵峰华[1] 吴山[1,2] 孙红福[1] 李静琴[1] 张梦[1] 

机构地区：[1]中国矿业大学(北京)地球科学与测绘工程学院,北京100083 [2]北京师范大学环境学院,北京100875

出　　处：《环境科学与技术》2010年第S2期115-118,共4页Environmental Science & Technology

基　　金：国家自然科学基金项目(40972110);教育部科学技术研究重点项目(109033);教育部新世纪优秀人才支持计划项目(NCET-07-0801);中央高校基本科研业务费项目资助(2009QD01;2009QD08)

摘　　要：文章研究了人工合成Schwertmannite矿物对Cd离子的吸附行为。研究结果表明Schwertmannite矿物对Cd2+具有很强的吸附能力,最大吸附量达到110mg/g;Schwertmannite对Cd2+的吸附属于单层吸附,吸附行为符合Langmuir吸附模型;Schwertmannite矿物对Cd2+的吸附行为受pH值影响很大,当pH<5时对Cd2+的吸附率很低,当pH>6时对Cd2+的吸附率急剧增加;Cd2+的吸附量与pH值呈正相关,吸附边约为pH 6.0～8.0,在pH为8时达到最大吸附量;Schwertmannite矿物对Cd2+的吸附为吸热反应,吸附量随着温度的升高而增大,ΔH约为16.595 kJ/mol。In this study,the adsorption behaviors of Cd2+ on schwertmannite were investigated.Schwertmannite can adsorb Cd2+ strongly,and the maximum adsorptive capacity of Cd2+ was 110mg/g.The adsorption behaviors of Cd2+ on schwertmannite were agreements with single-layer adsorption model and Langmuir isothermal equation.The adsorption behaviors of Cd2+ on schwertmannite were affected by pH.The adsorption rates of Cd2+ were very low when pH<5,but as pH>6 the adsorption rates of Cd2+ were increased sharply.The adsorptive capacity of Cd2+ on schwertmannite was correlated positively with pH,and the adsorption envelop is about pH 6.0~8.0.The pH of the maximum adsorptive capacity was 8.The adsorption proceed of Cd2+ on schwertmannite were endothermic reactions(ΔH 16.595kJ/mol).The adsorbance to Cd2+ increased with the increasing temperature.

关 键 词：SCHWERTMANNITE 镉离子 吸附 

分 类 号：X50[环境科学与工程—环境工程] X13