电解锰渣对水中Sb(V)、As(V)的吸附特征研究  

Study on the Adsorption Characteristics of Sb(V)and As(V)in Water by Electrolytic Manganese Residue

作　　者：吴再成 张国平[1] 柳凤娟 陈京晶 毛宽 WU Zaicheng;ZHANG Guoping;LIU Fengjuan;CHEN Jingjing;MAO Kuan(State Key Laboratory of Environmental Geochemistry,Institute of Geochemistry,Chinese Academy of Sciences,Guiyang 550081,China;University of Chinese Academy of Sciences,Beijing 100049,China;Guizhou Education University,College of Geography and Resources,Guiyang 550018,China)

机构地区：[1]中国科学院地球化学研究所环境地球化学国家重点实验室,贵阳550081 [2]中国科学院大学,北京100049 [3]贵州师范学院地理与资源学院,贵阳550018

出　　处：《地球与环境》2025年第1期133-142,共10页Earth and Environment

基　　金：科技部国家重点研发计划项目(2020YFC1807700);贵州省省级科技计划项目(黔科合基础-ZK[2022]一般330);贵州省省级科技计划项目(黔科合基础-ZK[2022]一般328)。

摘　　要：本文以电解锰厂的废渣作为吸附材料,以锑、砷溶液模拟污染废水,探究500℃高温煅烧的电解锰渣和原始电解锰渣对于废水中锑、砷的吸附特征。进行了吸附动力学实验、pH影响实验、等温吸附实验和共存离子抑制实验。结果表明:电解锰渣吸附Sb(Ⅴ)在12h达到平衡,As(Ⅴ)在6h达到平衡,伪二级动力学更适合描述电解锰渣对Sb(Ⅴ)、As(Ⅴ)的吸附过程。在整个吸附过程中,暗红色原有电解锰渣对Sb(Ⅴ)的吸附效果随pH的增加而减弱;热活化电解锰渣对Sb(Ⅴ)的吸附在pH<7时,吸附效果随pH的升高而逐渐降低,当pH>7时,吸附效果逐渐增加,在pH=9时达到吸附顶点,之后呈下降趋势。电解锰渣对As(Ⅴ)的吸附随pH增大而增强,pH为9时最大,之后略有下降。电解锰渣对Sb(Ⅴ)、As(Ⅴ)的吸附等温线变化特征采用Freundlich模型拟合效果更佳,拟合系数R2≥0.96,说明电解锰渣对Sb(Ⅴ)、As(Ⅴ)的吸附属于多层吸附。在pH为7时,5种阴离子中HPO42-对As(Ⅴ)和Sb(Ⅴ)吸附的抑制作用最明显。500℃煅烧后的电解锰渣在弱碱性环境中对Sb(Ⅴ)和As(Ⅴ)的污染修复具有良好的适用性。This article explores the adsorption characteristics of antimony and arsenic in wastewater by raw electrolytic manganese residue(EMR)and EMR calcined at 500℃.Experiments using simulated Sb(V)and As(V)were conducted to address the kinetic adsorption,isothermal adsorption as well as the effect of pH and coexisting anions on the adsorption of Sb(V)and As(V).The results showed that the adsorption of Sb(V)by EMR reached equilibrium at 12 h and the adsorption of As(V)reached equilibrium at 6 h.The adsorption of Sb(V)and As(V)on EMR could be suitably described by pseudo-second-order kinetic model.The different EMRs(different color,with or without calcination)showed varying characteristics of Sb(V)or As(V)adsorption.The adsorption of Sb(V)on the red raw EMR decreased with increasing pH.The adsorption of Sb(V)on the thermally activated EMR was lowest at pH 7.The adsorption effect of As(V)by EMR increased with the increase of pH,reaching the maximum of adsorption at pH 9,and then decreased.The adsorption of Sb(V)and As(V)by EMR was better fitted by Freundlich model with a coefficient R^(2)≥0.96,indicating that the adsorption of Sb(V)and As(V)by the raw EMR and the thermally activated EMR belongs to a multi-layer adsorption.At pH 7,HPO_(4)^(2-)showed the strongest inhibitory effect on the adsorption of As(V)and Sb(V)among the five anions.The EMR calcined at 500℃has good applicability to the pollution remediation of Sb(V)and As(V)in a weakly alkaline environment.

关 键 词：Sb(V) AS(V) 电解锰渣 吸附特征 

分 类 号：X703[环境科学与工程—环境工程]