作　　者： ; ; ; ;

机构地区： 邢台学院化学系

出　　处： 《环境污染与防治》 2005年第3期168-171,共4页

摘　　要： 研究了新生态MnO2对水中As(Ⅲ)的去除效果。结果表明:新生态MnO2对As(Ⅲ)去除率高,作用速度快,作用过程符合二级动力学方程;pH=6.5时吸附等温线符合Langmuir和Frundlich方程;pH<7时,As(Ⅲ)的去除率均达80%以上,受pH和初始浓度影响较小,且与H3AsO3的pKa无关的非特性吸附;阴离子与As(Ⅲ)有吸附竞争作用,阳离子的加入可使As(Ⅲ)的去除率接近100%。 The removal efficiency of As(Ⅲ) in water by nascent MnO_2 was studied. The results revealed: nascent MnO_2 for As(Ⅲ) has high removal rate, fast reaction and the adsorption kinetic date was described by second-order rate equation; The adsorption equilibrium date followed Langmuir and Frundlich model at pH=6.5;When pH value is below 7, the removal rate of As (Ⅲ) was over 80%, a small infect both of pH and initial concentration. It was not characteristic adsorption relation to pKa of H_3AsO_3. The anions in this system had a adsorption competition function to As(Ⅲ), The cations of Fe 2+ , Fe 3+ , Al 3+ etc. had a promoted efficiency, and the removal rate was almost 100%.

关 键 词： 去除作用 二氧化锰 新生态 三价砷 水 动力学方程 吸附等温线 去除率 去除效果 作用速度 作用过程 初始浓度 特性吸附 竞争作用 方程 阴离子 阳离子

领　　域： [化学工程] [农业科学] [农业科学]