以石墨为阴极的铝电絮凝去除水中五价砷  

Arsenate Removal from Water by Aluminum Electrocoagulation Using Graphite as Cathode

作　　者：王亚超 曹玉敏 张伟 张欣桐 蒋海成 吕建波 WANG Yachao;CAO Yumin;ZHANG Wei;ZHANG Xintong;JIANG Haicheng;LYU Jianbo(School of Civil Engineering,Yantai University,Yantai 264005,China;School of Environmental and Materials Engineering,Yantai University,Yantai 264005,China)

机构地区：[1]烟台大学土木工程学院,山东烟台264005 [2]烟台大学环境与材料工程学院,山东烟台264005

出　　处：《烟台大学学报(自然科学与工程版)》2025年第2期239-248,共10页Journal of Yantai University(Natural Science and Engineering Edition)

基　　金：山东省自然科学基金资助项目(ZR2019MEE046)。

摘　　要：为解决铝-铝电絮凝去除砷时溶解Al^(3+)浓度高、pH值上升快、铝极板损失高、运行成本高等问题,采用不同的材料(几种金属、不锈钢、石墨)作为阴极,对比其对铝阳极电絮凝去除水中五价砷的性能的影响,筛选出石墨作为优势阴极。进一步考察极板间距、电流密度、初始pH值和电解质类型对铝-石墨电絮凝去除五价砷的效率和经济性指标的影响,结果表明:极板间距对砷的去除效果无明显影响;电流密度与砷的去除速率呈正相关;初始pH值为7时砷的去除速率最快,但铝极板损失最大;无电解质时砷的去除速率最快,但电解质为NaNO_(3)时运行成本最低。采用Ferron法、XRD、Zeta电位、傅里叶红外光谱和BET等方法分析铝-铝电絮凝和铝-石墨电絮凝产生的铝物种和絮体的差异,结果表明铝-石墨电絮凝产生的絮体的铝物种更有利于砷的去除。利用电化学工作站分析电絮凝过程中的腐蚀性能、电化学阻抗谱与析氢性能等电极行为,结果表明铝-石墨电絮凝产生的絮体具有更小的比表面积、孔径和更低的含水率,有利于后续污泥的处理。To address the issues of high dissolved aluminum concentration,rapid pH rise,high aluminum electrode plate loss,and high operating costs in traditional aluminum-aluminum electrocoagulation for arsenic removal,different materials(including several metals,stainless steel,and graphite)were used as cathodes to compare their effects on the performance of aluminum anode electrocoagulation for removing pentavalent arsenic from water,resulting in the selection of graphite as the optimal cathode material.The impacts of electrode spacing,current density,initial pH,and electrolyte types on the efficiency and economic indicators of aluminum-graphite electrocoagulation for removing arsenate were further investigated.The results showed that the electrode spacing had no significant effect on the arsenic removal;current density was positively correlates with the rate of arsenic removal;the removal rate of arsenic was the fastest when the initial pH was 7,but the aluminum plate loss was also the highest;the removal rate of arsenic was the highest without an electrolyte,but the operating cost was the lowest when the electrolyte was NaNO_(3).The differences in aluminum species and flocs produced by aluminum-aluminum electrocoagulation and aluminum-graphite electrocoagulation were analyzed using the Ferron method,XRD,Zeta potential,FT-IR spectrum,and BET.The result indicated that the aluminum species in the flocs produced by aluminum-graphite electrocoagulation were more beneficial for arsenic removal.Additionally,the electrode behaviors,including corrosion performance,electrochemical impedance spectra,and hydrogen evolution reaction during the electrocoagulation progress,were examined using an electrochemical workstation.The results showed that the flocs produced by the aluminum-graphite electrocoagulation had a smaller specific surface area,pore size and lower water content,which is conducive to the subsequent sludge treatment.

关 键 词：电絮凝 阴极材料 砷 经济性指标 

分 类 号：X52[环境科学与工程—环境工程]