Decomplexation of Cu-1-hydroxyethylidene-1,1-diphosphonic acid by a three-dimensional electrolysis system with activated biochar as particle electrodes  

作　　者：Xing Wang Zilong Zhao Hongjie Wang Feng Wang Wenyi Dong 

机构地区：[1]School of Civil and Environmental Engineering,Harbin Institute of Technology Shenzhen,Shenzhen 518055,China [2]Shenzhen Key Laboratory of Water Resource Utilization and Environmental Pollution Control,Shenzhen 518055,China [3]State Key Laboratory of Urban Water Resource and Environment,School of Environment,Harbin Institute of Technology,Harbin 150090,China

出　　处：《Journal of Environmental Sciences》2023年第2期630-643,共14页环境科学学报（英文版）

基　　金：supported by the support from Youth Program of National Natural Science Foundation of China (No.52000051);Initial Scientific Research Foundation of Overseas High-level Talents of Harbin Institute of Technology (Shenzhen)(No.FA11409004);Natural Science Foundation of Guangdong Province (No.2017A030310670)

摘　　要：The feasibility of decomplexation removal of typical contaminants in electroplating wastewater,complexed Cu(Ⅱ)with 1-hydroxyethylidene-1,1-diphosphonic acid(Cu-HEDP),was first performed by a three-dimensional electrode reactor with activated biochar as particle electrodes.For the case of 50 mg/L Cu-HEDP,Cu(Ⅱ)removal(90.7%)and PO_(4)^(3−)conversion(34.9%)were achieved under the conditions of electric current 40 mA,initial pH 7,acid-treated almond shell biochar(AASB)addition 20 g/L,and reaction time 180 min,with second-order rate constants of 1.10×10^(−3) and 1.94×10^(−5) min^(−1) respectively.The growing chelating effect between Cu(II)and HEDP and the comprehensive actions of adsorptive accumulation,direct and indirect oxidation given by particle electrodes accounted for the enhanced removal of Cu-HEDP,even though the mineralization of HEDP was mainly dependent on anode oxidation.The performance attenuation of AASB particle electrodes was ascribed to the excessive consumption of oxygen-containing functionalities during the reaction,especially acidic carboxylic groups and quinones on particle electrodes,which decreased from 446.74 to 291.48μmol/g,and 377.55 to 247.71μmol/g,respectively.Based on the determination of adsorption behavior and indirect electrochemical oxidation mediated by in situ electrogenerated H_(2)O_(2) and reactive oxygen species(e.g.,•OH),a possible removal mechanism of Cu-HEDP by three-dimensional electrolysis was further proposed.

关 键 词：Cu-HEDP Electrochemical oxidation Particle electrode Reaction characteristics Removal mechanism 

分 类 号：X781.1[环境科学与工程—环境工程]