摘要
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%.
This work focuses on the removal of dimethyl arsenic（ DMA）,a typical pollutant with stable structure but difficult to be removed from water by traditional adsorption method. Here,we developed novel Fe3C loaded carbon nanofibers（ Fe3C/CF） as heterogeneous catalysts for the electric fenton degradation of DMA. It is found that Fe3C/CF could react with H2O2 during the Electro-Fenton process. Due to the presence of hydroxyl radicals around the cathode,DMA was finally degraded into methyl arsenic（ MMA） and As（ V）. The influence of experimental factors on the Electro-Fenton degradation of DMA was investigated,including initial p H,initial concentration,current density and catalyst dosage. The highest removal efficiency of 96% could be achieved under the condition of initial p H 3,initial concentration of 5 mg·L-1,current density at 0.15 A and catalyst dosage of 500 mg·L-1.
出处
《环境科学学报》
CAS
CSCD
北大核心
2016年第9期3230-3236,共7页
Acta Scientiae Circumstantiae
基金
国家自然科学基金(No.51478455)~~
关键词
Fe3C/碳纤维催化剂
二甲基砷
非均相电芬顿
电催化降解
Fe3C loaded carbon nanofibers
dimethyl arsenic
heterogeneous electro-fenton
electrocatalytic degradation
