水铁矿对As(Ⅲ)的吸附性能的研究  

Study on charactetistics of adsorption of As(Ⅲ) by ferrihydrite

作　　者：崔慧瑛[1] 梁成华[1] 杜立宇[1] 王楠[1] 

机构地区：[1]沈阳农业大学土地与环境学院,辽宁沈阳110000

出　　处：《浙江农业学报》2012年第3期490-493,共4页Acta Agriculturae Zhejiangensis

基　　金：国家重点基础研究发展计划项目(2004CB418504)

摘　　要：以人工合成的水铁矿为吸附材料,研究水铁矿对三价砷离子的吸附特征,探索试验过程中吸附剂的添加量、温度、pH值等因素对吸附效果的影响。结果表明,用Langmuir和Freundlich方程都可以很好的拟合吸附量与三价砷初始浓度之间的关系,其相关系数均可达到显著水平;水铁矿对三价砷的去除率最高可达99.5%;35℃下的吸附量均比25℃大;水溶液的pH值对水铁矿吸附三价砷有很重要的影响,pH<8时吸附量与吸附率随着pH上升而增加,pH=8时达到最大,pH>8时,其吸附量与吸附率随pH上升而降低。The present study measured the adsorption and desorption isotherms of As（Ⅲ） on the ferrihydrite surface and determined the effects of ferrihydrite dosages,temperatures and pH on As（Ⅲ） adsorption and desorption.The results showed that Langmuir and Freundlich equations could well describe the relationship between adsorption amount and the original concentration of As（Ⅲ）.The maximum adsorption rate of As（Ⅲ） by ferrihydrite was 99.5%.The adsorption amounts and adsorption rates at 35℃ were greater than at 25℃.The pH of the solution had great effects on the adsorption of As（Ⅲ）.The maximum adsorption rate of As（Ⅲ） was obtained at pH=8.

关 键 词：水铁矿 三价砷离子 吸附 温度 PH 

分 类 号：X53[环境科学与工程—环境工程]