氢氧化镁对废水中镉(Ⅱ)吸附性能的研究  

Study on the Treatment of Cadmium in Wastewater with Magnesium Hydroxide

作　　者：马艳飞[1] 王九思[2] 宋光顺[1] 张淑英[1] 

机构地区：[1]兰州交通大学环境与市政工程学院,甘肃兰州730070 [2]兰州交通大学化学与生物工程学院,甘肃兰州730070

出　　处：《兰州铁道学院学报》2003年第4期120-122,共3页Journal of Lanzhou Railway University

基　　金：甘肃省科技攻关项目 (GS0 12 B5 2 0 84)

摘　　要：采用氢氧化镁对含镉废水进行处理 .实验考察了氢氧化镁用量、搅拌时间、温度及pH对处理效果的影响 ,探讨了吸附作用机理 .结果表明 :氢氧化镁对镉 (Ⅱ )离子具有较强的吸附性能 ,去除率可达 99%以上 .氢氧化镁吸附镉 (Ⅱ )离子的最初速率与浓度成一级反应 ,在镉 (Ⅱ )离子浓度低于 80mg/L时 ,吸附等温线符合Langmuir模式 ,饱和吸附量为 2 6 .0 2mg/g.The treatment of wastewater containing cadmium by magnesium hydroxide was studied. The effects of magnesium hydroxide dose, stirring time, temperature and pH value were investigated. The mechanism for the adsorption was studied. The initial rate of Cd(Ⅱ)ion adsorption on magnesium hydroxide is first-order reacfion with respect to its concentration in solution. The results show that magnesium hydroxide has a better adsorption capacity, the removal rate reaches more than 99%. The adsorption isotherm accords with Langmuir mode when the concentration of Cd(Ⅱ)ion is under 80mg/L, the maximum adsorption amount is 26.02mg/g.

关 键 词：废水处理 氢氧化镁 镉离子 吸附性能 含镉废水 环保型水处理剂 去除率 

分 类 号：X703[环境科学与工程—环境工程]