改性石墨毡阴极电Fenton氧化法处理印染废水

Treatment of printing and dyeing wastewater by electro-Fenton oxidation process with modified graphite felt cathode

用α-环糊精(α-CD)辅助硫酸锰对N掺杂石墨毡(N/GF)改性,制备了N-Mn共掺杂改性石墨毡(N-Mn(α-CD)/GF),以N-Mn(α-CD)/GF为阴极构建电Fenton氧化体系用于处理印染废水。表征结果显示:N、Mn成功负载到GF表面,α-CD有助于克服Mn颗粒在GF表面的团聚,并能将含氧官能团引入GF表面,增强其亲水性。实验结果表明:在含三聚磷酸盐(TPP)的电Fenton氧化体系中,反应120 min后,H2O2的质量浓度为165 mg/L,重复6次后,H_(2)O_(2)的质量浓度降低至145 mg/L,降幅仅10.30%,表现出稳定的产H_(2)O_(2)性能;在TPP浓度5.0 mmol/L、曝气量1.5 L/min、电流200 mA、进水COD 1620~2200 mg/L、进水色度800~1000倍、反应时间120 min的条件下,印染废水经N-Mn(α-CD)/GF电Fenton氧化处理后,COD和色度去除率分别为88.31%和98.79%。

Graphite felt(GF)was doped with N and modified using manganese sulfate assisted withα-cyclodextrin(α-CD)to prepare N-Mn co-doped modified graphite felt(N-Mn(α-CD)/GF).An electro-Fenton oxidation system was constructed using N-Mn(α-CD)/GF as cathode,and the treatment effect of this system on printing and dyeing wastewater was investigated.The characterization results show that N and Mn are successfully loaded onto GF surface,α-CD helps to overcome the agglomeration of Mn particles on GF surface,and can introduce oxygen-containing functional groups into GF surface,thereby enhancing the hydrophilicity of GF.The experimental results show that:In the electro-Fenton oxidation system containing tirpolyphosphate(TPP),the mass concentration decreased by 10.30%from 165 mg/L for the first time to 145 mg/L after repeated for 6 times at the reaction time of 120 min,indicating the stable H_(2)O_(2) production performance of the system;Under the conditions of TPP concentration 5.0 mmol/L,aeration flow 1.5 L/min,current 200 mA,influent COD 1620-2200 mg/L,influent chroma 800-1000 times and reaction time 120 min,the removal rate of COD and chroma of the printing and dyeing wastewater after treated by electro-Fenton oxidation with N-Mn(α-CD)/GF cathode is 88.31%and 98.79%,respectively.