FeS_(2)/生物炭复合材料对As(Ⅲ)吸附和氧化去除的性能研究  

Preparation of Biochar-based FeS_(2) Composite for Adsorption and Oxidative Removal of As(Ⅲ) in Aqueous Solutions

作　　者：李丰 付敦 崔福田 崔希铜 桂和荣 LI Feng;FU Dun;CUI Futian;CUI Xitong;GUI Herong(Anhui Province Coal Mine Exploration Engineering Technology Research Center,School of Resources and Civil Engineering,Suzhou University,Suzhou 234000,China;School of Earth and Space Sciences,University of Science and Technology of China,Hefei 230026,China)

机构地区：[1]安徽省煤矿勘探工程技术研究中心宿州学院资源与土木工程学院,安徽宿州234000 [2]中国科学技术大学地球与空间科学学院,合肥230026

出　　处：《地球与环境》2021年第5期578-585,共8页Earth and Environment

基　　金：宿州学院博士科研启动项目(2021bsh002);安徽省大学生创新创业训练项目(201910379169);国家级大学生创新创业训练项目(202010379015)。

摘　　要：为解决水体As(Ⅲ)污染问题,本实验采用炭化沼渣废物耦合水热反应开发了一种新型生物炭基FeS_(2) 复合材料(FeS_(2) /BC)。应用场发射扫描电子显微镜(FESEM),X射线衍射技术(XRD)和比表面积分析仪对FeS_(2) /BC进行表征,探究了不同FeS_(2) /BC质量比,反应时间,As(Ⅲ)初始浓度以及过硫酸盐(PS)剂量等对As(Ⅲ)吸附和氧化去除的影响。结果表明FeS_(2) 成功地负载于沼渣BC上,在相同As(Ⅲ)吸附条件下,含FeS_(2) 较多的复合材料(FeS_(2) /BC(1∶1))具有最大的As(Ⅲ)吸附性能(84.5%),该吸附过程兼具单层和多层化学吸附,FeS_(2) /BC(1∶1)复合材料活化PS氧化去除As(Ⅲ)的最佳PS剂量为200μmol/L,在PS存在条件下,FeS_(2) /BC(1∶1)在短时间内(30 min)去除As(Ⅲ)的速率为0.0835 min^(-1),即实现了"1+1>2"的聚力效应,又缩短了As(Ⅲ)修复进程。因此,基于沼渣制备的FeS_(2) /BC复合材料在水体As(Ⅲ)吸附和氧化去除上效果明显,是一种有前景的As(Ⅲ)修复材料。In this study,a novel composite( FeS_(2) /BC) was developed by pyrolysis of solid digestate combined with hydrothermal reaction for As( Ⅲ) removal. The physico-chemical properties of FeS_(2) /BC were analyzed by field emission scanning electron microscope( FESEM),X-ray diffraction techniques( XRD) and specific surface area analyser. The effects of FeS_(2) /BC mass ratio,reaction time,initial concentration of As( Ⅲ) and persulfate( PS) on the adsorption and oxidation removal of As( Ⅲ) were investigated. The results showed that FeS_(2) was successfully loaded onto BC;under the same As( Ⅲ) adsorption conditions,FeS_(2) /BC( 1 ∶ 1) with a more FeS_(2) loading amount had the highest As( Ⅲ) adsorption performance( 84. 5%),and the adsorption process were ascribed to both monolayer and multilayer adsorption. The optimum PS concentration of FeS_(2) /BC( 1 ∶1) for As( Ⅲ) removal was 200 μmol/L. In the presence of PS,the kobsof As( Ⅲ) by FeS_(2) /BC( 1 ∶1) was 0. 083 5 min^(-1),which achieved the cohesion effect of‘1+1>2’and shorten the remediation process of As( Ⅲ) . Overall,this study suggests that the composite is a promising adsorbent and catalyst for As( Ⅲ) removal from aqueous solutions.

关 键 词：生物炭基复合材料 砷 吸附 氧化去除 废水处理 

分 类 号：X703[环境科学与工程—环境工程]