(1. 昆明理工大學(xué) 環(huán)境科學(xué)與工程學(xué)院，昆明 650500； 2. 云南農(nóng)業(yè)大學(xué) 資源與環(huán)境學(xué)院，昆明 650201)
摘 要: 浮選廢水中殘留烷基黃藥因其臭味、生物毒性、中堿性下穩(wěn)定及殘留回水對(duì)浮選工礦選別指標(biāo)的影響而受到嚴(yán)格控制。研究開發(fā)電催化內(nèi)電解技術(shù)(ECIME)協(xié)同電化學(xué)和內(nèi)電解特點(diǎn)，可實(shí)現(xiàn)廢水中烷基黃藥的有效去除。因此，以丁基黃藥(BX)為模板污染物，采用電化學(xué)表征和光譜分析等方法對(duì)烷基黃藥在ECIME體系的降解去除特征、反應(yīng)機(jī)制和產(chǎn)物途徑進(jìn)行探究。循環(huán)伏安掃描(CV)表明BX在碳微電極上能夠直接發(fā)生氧化還原反應(yīng)，在電解池的陽極和陰極室均能被降解去除。而復(fù)極化粒子電極和內(nèi)電解效應(yīng)降低BX分解對(duì)較低pH的依賴，使其在中性或偏堿性條件下可實(shí)現(xiàn)高效降解。電化學(xué)直接氧化還原和新生態(tài)?OH、Fe2+和[H]類等高活性物質(zhì)間接裂解協(xié)同作用是ECIME降解BX的主要機(jī)制。BX的主要降解歷程為BX及雙黃藥→正丁醇或碳酸二異丁酯和CS2→有機(jī)酸和H2CO3→H2O、CO2和SO42-，正丁醇和碳酸二異丁酯降解應(yīng)是BX降解控制環(huán)節(jié)。
關(guān)鍵字: 丁基黃藥；電催化；內(nèi)電解；降解機(jī)制；降解歷程
（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
