Fe0-CNTs-Cu活化O2降解水中2,4-二氯苯酚

为高效去除废水中长期残留、高毒性、难生物降解的氯苯酚类污染物，采用高能球磨-高温熔融-液相还原法制备能将氧气高效且选择性地还原为H₂O₂同时将原位产生的H₂O₂分解为·OH/O₂·^-的新型材料（Fe⁰-CNTs-Cu），探讨了条件因素对2，4-二氯苯酚（2，4-DCP）降解效果的影响，初步分析了Fe⁰-CNTs-Cu/O₂体系的降解机理，并推测了2，4-DCP该体系下的降解途径.结果表明，Fe⁰-CNTs-Cu在优化条件下对2，4-DCP的降解率和TOC去除率分别为92.3%和54.2%.在Fe⁰-CNTs-Cu/O₂体系中形成腐蚀电池，促使O₂在CNTs表面选择性还原为H₂O₂，Cu⁰和Cu₂O、CNTs以及原位产生的Fe²⁺，将原位产生的H₂O₂催化分解为高氧化物质·OH/O₂·^-，高效氧化降解2，4-DCP.

Research on the oxidative degradation of 2,4-dichlorophenol in water by Fe0-CNTs-Cu activation

In order to efficiently remove chlorophenols pollutants from wastewater, which are persistent, highly toxic and difficult to biodegrade, a new material (Fe⁰-CNTs-Cu) that could efficiently and selectively reduce oxygen to H₂O₂ and decompose the in-situ H₂O₂ to ·OH/O₂·^- was prepared by high energy ball milling-high temperature melting-liquid phase reduction method. The degradation mechanism of Fe⁰-CNTs-Cu/O₂ system was analysed, and the degradation pathway of 4-CP in this system was speculated. The degradation rate and TOC removal rate of Fe⁰-CNTs-Cu for 2,4-dichlorophenol (2,4-DCP) under the optimized conditions were 92.3% and 54.2%, respectively. In the Fe⁰-CNTs-Cu/O₂ system, a corrosion cell was formed to induce the selective reduction of O₂ on the surface of CNTs to H₂O₂, Cu⁰, Cu₂O and CNTs as well as the in situ generated Fe²⁺. The in situ generated H₂O₂ was catalytically decomposed to the highly oxidized material ·OH/O₂·^-, which could efficiently oxidatively degrade 2,4-DCP.