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针对结构稳定且难以靠常规方法去除的二甲基砷,制备新型负载Fe_3C纳米粒子的炭纤维催化剂,并对其非均相电芬顿降解二甲基砷进行了研究.结果表明,纳米Fe_3C/CF与阴极产生的H2O2发生电芬顿催化反应产生羟基自由基将二甲基砷降解为一甲基砷和As(V),As(V)可被同步吸附在Fe_3C/CF催化剂表面.通过考察电催化过程中初始p H、反应物初始浓度、电流强度和催化剂投加量等因素对催化氧化DMA效果的影响,表明在初始p H为3,二甲基砷初始浓度为5 mg·L~(-1),Fe_3C/CF投量为500 mg·L~(-1)的最佳条件下,经非均相电芬顿反应360 min后,二甲基砷去除率高达96%.
A new type of carbon fiber catalyst supported on Fe_3C nanoparticles was prepared for dimethyl arsenic which is stable in structure and hard to be removed by conventional methods. The heterogeneous Fenton degradation of dimethyl arsenic was carried out. The results showed that nano Fe_3C / Hydrogen peroxide generated from CF and the cathode produces Fe (OH) 3 as a free radical to catalyze hydroxyl radicals to degrade dimethyl arsenic to As (V) and As (V), and As (V) can be simultaneously adsorbed on the surface of Fe 3 C / The effects of initial pH, initial concentration of reactants, current intensity and dosage of catalyst on the catalytic oxidation of DMA were investigated. The results showed that when the initial pH was 3 and the initial concentration of dimethyl arsenate was 5 mg · L ~ (-1) and Fe_3C / CF (500 mg · L -1), the removal of dimethyl arsenate reached 96% after heterogeneous electrowinning for 360 min.