摘要
采用溶胶-凝胶法制备了河底泥陶粒负载Sn-Sb-TiO_2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SnSb-TiO_2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Na_2SO_4浓度为0.1 mol/L、电流密度为20 mA/cm^2、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 than90%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.
作者
吴勇
鲍扬
朱兆连
仲维啸
王海玲
WU Yong;BAO Yang;ZHU Zhao-lian;ZHONG Wei-xiao;WANG Hai-ling(School of Environmental Science and Engineering,Nanjing Tech University,Nanjing 211800,China;Jiangsu Key Laboratory of Industrial Water-conservation and Emission Reduction,Nanjing 211800,China)
出处
《现代化工》
CAS
CSCD
北大核心
2019年第4期71-74,76,共5页
Modern Chemical Industry
基金
国家自然科学基金青年科学基金项目(51308284)
