采用溶胶-凝胶法制备了河底泥陶粒负载Sn-Sb-TiO₂电极，并通过SEM和XRD对其进行表征，考察了该电极对2，4-二硝基甲苯模拟废水的电催化降解性能，初步探讨了还原产物和还原机理。结果表明，制备的电极表面有较致密的Sn-Sb-TiO₂金属氧化物表层，对2，4-二硝基甲苯模拟废水有很好的电催化处理效果。当2，4-二硝基甲苯初始质量浓度为100 mg/L、电解质Na₂SO₄浓度为0.1 mol/L、电流密度为20 mA/cm²、曝气量为300 mL/min、中性条件下处理120 min时，对2，4-二硝基甲苯去除率达到94.31%，且循环使用10次处理效果依然维持在90%以上，性能未见明显下降。通过对还原产物浓度变化分析得出，2，4-二硝基甲苯的主要还原中间产物为2-氨基-4-硝基甲苯，最终还原产物为2，4-二氨基甲苯。

Sn-Sb-TiO₂ electrode loaded by river sediment ceramsite is prepared through sol-gel method and characterized by SEM and XRD.The performance of this electrode in electrocatalytic degradation of simulated 2,4-dinitrotoluene wastewater is investigated,and the corresponding reduction products and reduction mechanism are discussed preliminarily.The results show that there is a dense Sn-Sb-TiO₂ metal oxide surface layer on the surface of the prepared electrode,which exhibits good electrocatalytic treatment effect on simulated 2,4-dinitrotoluene wastewater.The 2,4-dinitrotoluene removal rate can reach 94.31% when the initial concentration of 2,4-dinitrotoluene is 100 mg·L^-1,the concentration of electrolyte Na₂SO₄ is 0.1 mg·L^-1,the current density is 20 mA·cm^-2,the aeration volume is 300 mL·min^-1 and the treatment time is 120 min under neutral condition.Furthermore,the removal rate will keep more than 90% and the performance is not significantly reduced after the electrode is repeatedly used for ten times.By analyzing the concentration changes of the reduction products,it is found that 2-amino-4-nitrotoluene is the main reduction intermediate and 2,4-diaminotoluene is the final reduction product.

吴勇(1994-),男,硕士研究生,研究方向为水处理,1546488007@qq.com