Full-Text Search:
Home|Journal Papers|About CNKI|User Service|FAQ|Contact Us|中文
《Environmental Science & Technology》 2018-06
Add to Favorite Get Latest Update

Study on Mechanism of Citrate-Ni De-complexation by Electro-oxidation-electrocoagulation Process

ZHAO Ganlin;XU Haiyin;LUO Yuanling;YANG Zhaohui;Changsha Environmental Protection College;Central South University of Forestry and Technology;College of Environmental Science and Engineering,Hunan University;  
An experimental study was carried out focusing on breakdown of citrate-Ni complex in wastewater by using the electrooxidation-electrocoagulation process based on Ti/RuO_2-IrO_2and Fe electrolyte,in which effects of the electrolyte and parameters of initial pH value,current density and electrolytic time on citrate-Ni and its decomplexation behavior were investigated.As a result,high removal rates were achieved(99.6%of Ni,75%of COD_(Cr))under the condition,i.e.,initial pH 5,100A/m~2of current density,25 min of electrochemical oxidation reaction time,and 20 min of electrocoagulation reaction time with the NaCl as the electrolyte;and concentrations of Ni and COD in the wastewater being treated met the requirements of the Emission Standard of Pollutants for Electroplating(GB 21900-2008).In addition,it was also found that the de-complexation mechanism of citrate-Ni related to the complex structure breakdown to small molecules such as C_3H_6O,HCOOH,CH_3COOH,C_3H_6O_3,C_4H_8O_3 and C_5H_6O_5,etc.,through direct oxidation of Ti/RuO_2-IrO_2 and the indirect oxidation product(HOCl),and Ni was finally removed by adsorption and coagulation of the fresh Fe(OH)_2that was produced by Fe-electrocoagulation.
【Fund】: 国家自然科学基金资助项目(51578223);; 2015年湖南省环保厅资助项目:基于BDD/ACF电极的电化学氧化耦合电絮凝处理重金属有机物络合废水的技术研究;; 中南林业科技大学青年科学研究基金资助项目(2016YJ019);; 湖南省自然科学基金(2018JJ3884);; 湖南省科技计划项目(2017SK2383)
【CateGory Index】: X781.1
Download(CAJ format) Download(PDF format)
CAJViewer7.0 supports all the CNKI file formats; AdobeReader only supports the PDF format.
©2006 Tsinghua Tongfang Knowledge Network Technology Co., Ltd.(Beijing)(TTKN) All rights reserved