MnO2改性累托石/污泥生物炭复合材料的制备及其对Pb（Ⅱ）和Cd（Ⅱ）吸附特性研究  

Preparation and Adsorption Properties of MnO2 Modified Rectorite/Sludge Derived Biochar Composites for Removal Pb（Ⅱ） and Cd（Ⅱ） in Water

作　　者：张隽晔 周培疆[1] 管鲲 ZHANG Junye;ZHOU Peijiang;GUAN Kun(Hubei Biomass-Resource Chemistry and Environmental Biotechnology Key laboratory,School of Resource and Environmental Sciences,Wuhan University,Wuhan 430079 ,China)

机构地区：[1]武汉大学资源与环境科学学院湖北省生物质资源化学与环境生物技术重点实验室

出　　处：《安全与环境工程》2019年第3期101-108,共8页Safety and Environmental Engineering

基　　金：国家自然科学基金项目(20577036、20777058、20977070);湖北省自然科学基金重点项目(2015CFA137);武汉大学生态环境技术研发及科技服务中心项目

摘　　要：为提高累托石/污泥生物炭复合材料的吸附特性,在通过混合热解法制备的累托石/污泥生物炭复合材料的基础上,利用氧化还原反应制备得到MnO2改性的累托石/污泥生物炭复合材料,对改性前后的复合材料进行了表征和吸附特性研究。结果表明:MnO2改性的累托石/污泥生物炭复合材料的比表面积以及微孔和介孔的数量远高于未改性的复合材料,改性复合材料中的MnO2是无定形的且材料表面含有丰富的含氧官能团;改性后的复合材料对Pb(Ⅱ)和Cd(Ⅱ)的吸附量远高于未改性的复合材料,其吸附过程受pH值的影响较大;该改性复合材料对Pb(Ⅱ)和Cd(Ⅱ)的吸附动力学和等温线分别符合Elovich模型和Langmuir等温线方程,其吸附热力学分析结果表明该改性复合材料对Pb(Ⅱ)和Cd(Ⅱ)的吸附过程是自发的吸热过程,且混乱度增加。可见,MnO2改性的累托石/污泥生物炭复合材料是一种具有潜力的重金属吸附剂。This paper fabricates MnO2 modified rectorite/sludge derived biochar composites through redox reaction to enhance the adsorption properties of pristine rectorite/ sludge derived biochar composites prepared by mixed and then pyrolysis method. The paper investigates characterization and adsorption properties of the composites before and after modification. The results indicate that the BET surface area and the amount of microporous and mesoporous of the modified composites are much more than the pristine composites. The MnO2 fabricated in this work is amorphous and the surface of the composites is rich in surface functional groups. The adsorption of Pb (Ⅱ) and Cd (Ⅱ) onto the modified composites is a highly pH-dependent process.The adsorption kinetics and isotherms of Pb(Ⅱ) and Cd(Ⅱ) onto the modified composites fit well with Elovich kinetic model and Langmiur isotherm model. The adsorption thermodynamic shows that the adsorption of Pb(Ⅱ) and Cd(Ⅱ) onto the modified composites is spontaneous,endothermic in nature and randomness increased process. Therefore,M11O2 modified rectorite/sludge derived biochar composites are potential heavy metal adsorbents.

关 键 词：累托石/污泥生物炭复合材料 二氧化锰(MnO2)改性 吸附特性 Pb(Ⅱ) Cd(Ⅱ) 

分 类 号：X703[环境科学与工程—环境工程]