浮选废水中烷基黄药的电催化内电解降解特征及机制  

Degradation characteristics and mechanisms of alkyl xanthates from flotation wastewater by ECIME process

作　　者：聂蕊[1] 李天国[2] 徐晓军[1] 段正洋 何昌华[1] 解道雷 刘树丽[1] NIE Rui;LI Zian-guo;XU Xiao-jun;DUAN Zheng-yang;HE Chang-hua;XIE Dao-leil;LIU Shu-li(Faculty of Environmental Science and Technology, Kunming University of Science and Technology, Kunming 650500, China;College of Resources and Environment, Yunnan Agricultural University, Kunming 650201, China)

机构地区：[1]昆明理工大学环境科学与工程学院,昆明650500 [2]云南农业大学资源与环境学院,昆明650201

出　　处：《中国有色金属学报》2018年第3期594-603,共10页The Chinese Journal of Nonferrous Metals

基　　金：云南省教育厅科学研究基金项目(2013Y327)~~

摘　　要：浮选废水中残留烷基黄药因其臭味、生物毒性、中碱性下稳定及残留回水对浮选工矿选别指标的影响而受到严格控制。研究开发电催化内电解技术(ECIME)协同电化学和内电解特点,可实现废水中烷基黄药的有效去除。因此,以丁基黄药(BX)为模板污染物,采用电化学表征和光谱分析等方法对烷基黄药在ECIME体系的降解去除特征、反应机制和产物途径进行探究。循环伏安扫描(CV)表明BX在碳微电极上能够直接发生氧化还原反应,在电解池的阳极和阴极室均能被降解去除。而复极化粒子电极和内电解效应降低BX分解对较低pH的依赖,使其在中性或偏碱性条件下可实现高效降解。电化学直接氧化还原和新生态·OH、Fe^(2+)和[H]类等高活性物质间接裂解协同作用是ECIME降解BX的主要机制。BX的主要降解历程为BX及双黄药→正丁醇或碳酸二异丁酯和CS_2→有机酸和H_2CO_3→H_2O、CO_2和SO_4^(2-),正丁醇和碳酸二异丁酯降解应是BX降解控制环节。The mineral flotation wastewater containing residual alkyl xanthates have to be strictly controlled because of its stench, biotoxicity, stable in the p H conditions of neutral or alkaline, and greatly influence on mineral separation indexes when residual in reuse water. Treatment with the proposed electrocatalytic internal micro-electrolysis（ECIME） which cooperates the characteristics of electrochemical and internal micro-electrolysis（IME） is an effective approach to remove alkyl xanthates from wastewater. Therefore, the degradation characteristics, reaction mechanism and pathways of this pollutant toward the remediation technology must be considered deeply. In this work, butyl xanthate（BX） was used as the template of pollutant, electrochemical characterization and spectroscopy analysis methods was conducted to explode this key point. Cyclic voltammetric（CV） indicates that BX can be generated redox reaction directly at the carbon microelectrode and degraded in anode and cathode chamber of the electrolysis cell. The effects of repolarization particle electrode and IME reduce the dependence of BX decomposition on low p H and can realize high degradation efficient in the neutral or alkaline conditions. The dominant degradation mechanism of BX in ECIME system is the electrocatalytic redox directly and mineralization by ·OH indirectly which generates in situ. The main pathways of BX in ECIME system are followed by BX, dixanthogen→N-butyl alcohol or diisobutyl carbonate, CS_2→organic acid, H_2CO_3→H_2O, CO_2, SO_4^（2-）. The further degradation N-butyl alcohol or diisobutyl carbonate should be the controlling reaction.

关 键 词：丁基黄药 电催化 内电解 降解机制 降解历程 

分 类 号：X751[环境科学与工程—环境工程]