Transactions of Nonferrous Metals Society of China The Chinese Journal of Nonferrous Metals

您目前所在的位置:首页 - 期刊简介 - 详细页面

中国有色金属学报

ZHONGGUO YOUSEJINSHU XUEBAO

第28卷    第3期    总第228期    2018年3月

[PDF全文下载]    [Flash在线阅读]    [HTML全文阅读]

    

文章编号:1004-0609(2018)-03-0594-10
浮选废水中烷基黄药的电催化内电解降解特征及机制
聂 蕊1*,李天国2*,徐晓军1,段正洋1,何昌华1,解道雷1,刘树丽1

(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)

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、Fe2+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CS2→有机酸和H2CO3→H2O、CO2和SO42-,正丁醇和碳酸二异丁酯降解应是BX降解控制环节。

 

关键字: 丁基黄药;电催化;内电解;降解机制;降解历程

Degradation characteristics and mechanisms of alkyl xanthates from flotation wastewater by ECIME process
NIE Rui1*, LI Tian-guo2*, XU Xiao-jun1, DUAN Zheng-yang1, HE Chang-hua1, XIE Dao-lei1, LIU Shu-li1

1. Faculty of Environmental Science and Technology, Kunming University of Science and Technology, Kunming 650500, China; 2. College of Resources and Environment, Yunnan Agricultural University, Kunming 650201, China

Abstract:The mineral flotation wastewater containing residual alkyl xanthates have to be strictly controlled because of its stench, biotoxicity, stable in the pH 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 pH 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, CS2→organic acid, H2CO3→H2O, CO2, SO42-. The further degradation N-butyl alcohol or diisobutyl carbonate should be the controlling reaction.

 

Key words: butyl xanthate; electrocatalytic; internal micro-electrolysis; degradation mechanism; pathway

ISSN 1004-0609
CN 43-1238/TG
CODEN: ZYJXFK

ISSN 1003-6326
CN 43-1239/TG
CODEN: TNMCEW

主管:中国科学技术协会 主办:中国有色金属学会 承办:中南大学
湘ICP备09001153号 版权所有:《中国有色金属学报》编辑部
------------------------------------------------------------------------------------------
地 址:湖南省长沙市岳麓山中南大学内 邮编:410083
电 话:0731-88876765,88877197,88830410   传真:0731-88877197   电子邮箱:f-ysxb@mail.csu.edu.cn