电解锰渣-方解石复合吸附剂对水中镉的吸附  

Adsorption Behaviors of Cd(Ⅱ) by Electrolytic Manganese Residues-Calcite Composite Adsorbent

作　　者：马梦雨 魏华 宋小龙 季成 王伟亚 田凯夫 李佳 Ma Mengyu;Wei Hua;Song Xiaolong;Ji Cheng;Wang Weiya;Tian Kaifu;Li Jia(School of Resource and Environment,South-Central University for Nationalities,Wuhan,Hubei 430074)

机构地区：[1]中南民族大学资源与环境学院,湖北武汉430074

出　　处：《非金属矿》2020年第3期89-92,共4页Non-Metallic Mines

基　　金：国家自然科学基金(51804354);中央高校科研专项项目(CZD19006)。

摘　　要：针对水体Cd(Ⅱ)污染问题,将电解锰渣(EMR)与方解石进行热改性制备复合吸附剂(F-EMR)。研究重金属溶液初始pH值、吸附时间和吸附温度等对吸附剂去除溶液中Cd(Ⅱ)的影响,并结合吸附动力学和等温吸附模型对其进行分析。结果表明:随着pH值的增大,复合吸附剂对于水溶液中Cd(Ⅱ)的吸附量呈先增加后略微降低的趋势,当Cd(Ⅱ)为450 mg/L时,Cd(Ⅱ)的最大吸附量可达435.69 mg/g。复合吸附剂对于Cd(Ⅱ)的吸附动力学符合准二级动力学模型,对Cd(Ⅱ)的等温吸附符合Langmuir吸附模型,在平衡状态下Cd(Ⅱ)的最大吸附容量为467.14 mg/g。电解锰渣-方解石复合吸附剂可作为吸附材料应用于重金属污染水体的治理,这一技术为电解锰渣的减量化处理提供了新思路,对硅酸盐矿冶废弃物的资源化利用也具有一定意义。The composite adsorbent(F-EMR)was obtained by mixing the electrolytic manganese residues(EMR)and calcite after thermal treatment to adsorb Cd(Ⅱ)in aqueous solution.The effects of initial pH,adsorption time and temperature on the removal of Cd(Ⅱ)were discussed.The adsorption kinetics and isothermal adsorption model were adopted to analyze the adsorption behaviors of Cd(Ⅱ)on F-EMR.The adsorption capacity of F-EMR for Cd(Ⅱ)in aqueous solution increases first and then decreases with the increase of pH.The maximum adsorption capacity of 435.69 mg/g is reached when 450 mg/L Cd(Ⅱ)is applied.Moreover,the adsorption kinetics of F-EMR for Cd(Ⅱ)is in accordance with the quasi-second-order kinetics model,and the isothermal adsorption capacity of Cd(Ⅱ)is in accordance with the Langmuir isotherm model.According to Langmuir adsorption model,the maximum adsorption capacity of Cd(Ⅱ)adsorbed in equilibrium state is 467.14 mg/g.The F-EMR can be used as the adsorption material for the treatment of heavy metal polluted water.Meanwhile,EMR could be recycled and provide a new clue for the treatment of solid waste.

关 键 词：电解锰渣 热改性 吸附 重金属离子 

分 类 号：X75[环境科学与工程—环境工程]