Efficient decomposition of sulfamethoxazole in a novel neutral Fered-Fenton like/oxalate system based on effective heterogeneous-homogeneous iron cycle

In this study,efficient sulfamethoxazole(SMX) degradation was demonstrated in a novel neutral FeredFenton like/oxalate(electro-Fe^2+/PDS/Ox,Fered-FL/Ox) system adopting pre-anodized Ti@Ti02 cathode.Optimization of operational parameters was conducted and the whole reaction mechanism based on the critical solid-liquid interfacial reactions was explored.An efficient neutral heterogeneous-homogenous iron cyclewould exist in the Fered-FL/Ox system,depending on the formation of specific C-O-Ti bonds through the inner sphere surface complex(ISSC) of Fe(C2 O4)3^3-.It would induce ultrafast electron transfer from the cathode to the FeⅢ core,effectively accelerating the neutral Fenton-like reactions and complete mineralization of SMX with relative low dosage of ferrous catalyst and applied voltage.The result of this study is expected to supply a good alternative in treating complex neutral industrial wastewaters.

Fered-Fenton法处理石化废水反渗透浓水

以Ti金属网为阴极、Ti负载Ru O2金属网为阳极,构建Fered-Fenton反应系统,处理石化废水反渗透膜法浓水。考察H2O2浓度、Fe2+浓度、初始p H值和电流密度等因素对废水处理效果的影响,并分析了废水可生化性及污染物降解规律。结果表明,在H2O2浓度为75.0 mmol/L,Fe2+浓度为7.5 mmol/L,初始p H值为3.0,电流密度为5.1 m A/cm2的条件下,反应120 min后废水TOC可由198.2 mg/L降到99.6 mg/L,有机污染物矿化率达到49.7%,BOD5/COD由0.11提高至0.31,废水可生化性明显改善。三维荧光光谱(EEM)分析结果表明,Fered-Fenton法对废水中类蛋白、类富里酸等荧光有机物去除率达到66.7%,该类大分子难降解有机物的氧化降解有利于改善废水可生化性,为进一步的生化处理创造了良好的条件。