铁氧化物改性玉米芯生物炭对水体中砷的吸附特性研究  

Adsorption Characteristics of Arsenic in Water Body by Iron Oxide-modified Corncob Biochar

作　　者：陈文敏 谭志强[3] 张家泉 李崇瑞 张丽 张银凤 段宁[1] 陈人佑 左亚杰 马天跃 CHEN Wenmin;TAN Zhiqiang;ZHANG Jiaquan;LI Chongrui;ZHANG Li;ZHANG Yinfeng;DUAN Ning;CHEN Renyou;ZUO Yajie;MA Tianyue(School of Resources and Environmental Engineering,Wuhan University of Science and Technology,Wuhan 430080,China;Hubei Key Laboratory of Mine Environmental Pollution Control and Remediation,Hubei Polytechnic University,Huangshi 435003,China;State Key Laboratory of Environmental Chemistry and Ecotocicology,Research Center for Eco-Environmental Sciences,Chinese Academy of Sciences,Beijing 100085,China;School of Environmental Science and Engineering,Hubei Polytechnic University,Huangshi 435003,China)

机构地区：[1]武汉科技大学资源与环境工程学院,湖北武汉430080 [2]湖北理工学院矿区环境污染控制与修复湖北省重点实验室,湖北黄石435003 [3]中国科学院生态环境研究中心环境化学与生态毒理学国家重点实验室,北京100085 [4]湖北理工学院环境科学与工程学院,湖北黄石435003

出　　处：《安全与环境工程》2023年第5期266-272,288,共8页Safety and Environmental Engineering

基　　金：湖北省高等学校大学生创新训练项目(S202210920013);湖北省高等学校优秀中青年科技创新团队计划项目(T201729)。

摘　　要：为探究铁氧化物改性玉米芯生物炭对水体中砷的吸附特性,修复砷污染水体,利用比表面积测试仪(BET)、扫描电子显微镜(SEM)和傅里叶红外光谱(FTIR)对铁氧化物改性玉米芯生物炭(FX)和玉米芯生物炭(X)的比表面积、表面形貌和官能团进行表征,并分析了不同溶液初始pH值、初始砷浓度和吸附时间对水体中砷去除率的影响。结果表明:经铁氧化物改性后的玉米芯生物炭的比表面积和孔体积增加,铁氧化物负载在玉米芯生物炭上,有丰富的官能团;在溶液初始pH值为3时,FX对砷的去除率为97.8%,FX对砷的去除率随pH值的升高而下降;FX对水体中砷的吸附过程符合准二级动力学模型和Langmuir模型,对砷的最大吸附容量为18.02 mg/g;FX对水体中砷的吸附机制主要是静电吸附和化学吸附,且FX具有良好的循环利用潜力。In order to repair arsenic-polluted water,iron oxide-modified corncob biochar(FX)is prepared to explore the adsorption characteristics of arsenic.Specific surface area,surface topography and functional groups of iron oxide-modified corncob biochar(FX)and corncob biochar(X)are characterized by surface ar-ea analyzer(BET),scanning electron microscope(SEM)and fourier transform infrared(FTIR),and the effects of initial pH value,initial arsenic content and adsorption time on removal rate of arsenic in water body were investigated.The results show an increase of the specific surface area and pore size of FX,and the iron oxide is loaded on the corncob biochar with abundant functional groups.When the initial pH value of the solution is 3,the removal rate of arsenic by FX is 97.8%.The removal rate decreases due to the in-crease of pH value.The maximum adsorption capacity of FX is 18.02 mg/g,in accordance with Langmuir adsorption model and quasi-second-order kinetic equation,The adsorption mechanism of FX arsenic is main-ly electrostatic adsorption and chemisorption,and FX shows a good recycling ability.

关 键 词：改性玉米芯生物炭 铁氧化物 砷 吸附特性 

分 类 号：X703[环境科学与工程—环境工程]