铁锰氧化物-微生物负载生物质炭材料对镉和砷的吸附机制  

Novel Insight into the Adsorption Mechanism of Fe-Mn Oxide-Microbe Combined Biochar for Cd(Ⅱ)and As(Ⅲ)

作　　者：连斌 吴骥子 赵科理[1,2] 叶正钱[1,2] 袁峰 LIAN Bin;WU Ji-zi;ZHAO Ke-li;YE Zheng-qian;YUAN Feng(College of Environmental and Resource Sciences,Zhejiang A&F University;Key Laboratory of Soil Contamination Bioremediation of Zhejiang Province,Zhejiang A&F University;Zhejiang Provincial Key Laboratory of Agricultural Resources and Environment;Hangzhou Xihu Environment Group)

机构地区：[1]浙江农林大学环境与资源学院,临安311300 [2]浙江农林大学浙江省土壤污染生物修复重点实验室,临安311300 [3]浙江省农业资源与环境重点实验室,杭州310058 [4]杭州西湖环境集团有限公司,杭州310013

出　　处：《环境科学》2022年第3期1584-1595,共12页Environmental Science

基　　金：国家重点研发计划项目(2016YFD0200302,2017YFD0801302);浙江省自然科学基金项目(LY17D010009);浙江省重点研发计划项目(2015C02011)。

摘　　要：制备得到了一种铁锰氧化物-微生物负载生物质炭材料(FM-DB),以同时去除水体中Cd(Ⅱ)和As(Ⅲ)污染.铁锰氧化物-微生物负载生物质炭材料(FM-DB)中铁锰氧化物(FMBO)和山核桃蒲生物质炭(CCSB)的最佳比例为3%+3%.FM-DB耐酸性、机械强度和传质性能良好,在二元体系下对Cd(Ⅱ)和As(Ⅲ)的最大去除率高达77.29%和99.94%.表征分析证实了FM-DB制备成功且具有丰富的官能团结构.FM-DB对Cd(Ⅱ)和As(Ⅲ)单因素吸附实验结果表明,不同条件下复合材料对Cd(Ⅱ)和As(Ⅲ)均有一定的吸附能力,但受到初始pH、平衡时间和初始浓度的影响.FM-DB对Cd(Ⅱ)和As(Ⅲ)吸附动力学和吸附热力学结果表明,复合材料对Cd(Ⅱ)和As(Ⅲ)的吸附平衡时间分别为3.5 h和8 h,最大吸附容量分别为59.27 mg·g^(-1)和84.73 mg·g^(-1);复合材料对Cd(Ⅱ)和As(Ⅲ)吸附主要受到材料表面电子的交换及共用、络合作用的影响,整个吸附过程则既存在单层吸附,也存在不均匀表面的多层吸附,是一个多步骤过程,可能包括外表面扩散和粒子内扩散.此外,对比一元体系和二元体系下复合材料的去除率发现,在二元体系下,Cd(Ⅱ)和As(Ⅲ)离子间存在相互促进吸附的作用.综上所述,FM-DB是一种高效吸附材料,适用于修复Cd(Ⅱ)和As(Ⅲ)复合污染水体.A Fe-Mn oxide-microbe combined biochar(FM-DB)was prepared to simultaneously remove Cd(Ⅱ)and As(Ⅲ)contamination in an aqueous system.In the FM-DB,the best ratio of Fe-Mn oxide(FMBO)and carya cathayensis shell biochar(CCSB)was 3%+3%.The material had good acid resistance,mechanical strength,and mass transfer performance,and the maximum removal rates for Cd(Ⅱ)and As(Ⅲ)in the binary system were 77.29%and 99.94%,respectively.Characterization confirmed that the FM-DB was successfully prepared and had a rich functional group structure.The single-factor adsorption test results for Cd(Ⅱ)and As(Ⅲ)showed that the composite material had a certain adsorption capacity affected by initial pH,equilibration time,and initial concentration for Cd(Ⅱ)and As(Ⅲ)under different conditions.The adsorption isotherm and kinetic data indicated the adsorption equilibrium time for Cd(Ⅱ)and As(Ⅲ)was 3.5 h and 8 h,and the maximum capacity was 59.27 mg·g^(-1)and 84.73 mg·g^(-1),respectively.The adsorption of Cd(Ⅱ)and As(Ⅲ)was mainly affected by the electron exchange,electron sharing,and complexation on the surface of the material.The whole adsorption process was a combination of single-layer adsorption and multi-layer adsorption on an uneven surface.The adsorption process was a multi-step process,including outer surface diffusion and inner particle diffusion.In addition,comparing the removal rate of composite materials in the single-component system and the binary system,a mutual promotion of adsorption between Cd(Ⅱ)and As(Ⅲ)was found under the binary system.In conclusion,oxide-microbe combined biochar could be an efficient adsorption material and was suitable for the remediation of aqueous system pollution caused by Cd(Ⅱ)and As(Ⅲ).

关 键 词：重金属 铁锰氧化物 生物质炭 微生物 联合修复 

分 类 号：X53[环境科学与工程—环境工程]