火炸药学报2016，Vol.39Issue(6)：38-43,6.DOI:10.14077/j.issn.1007-7812.2016.06.006
复合催化剂光催化降解DNT废水及其降解机理
Photocatalytic Degradation of DNT Wastewater by Composite Catalyst and Its Degradation Mechanism
摘要
Abstract
To explore the catalytic activity and degradation mechanism of the photocatalytic degradation of explosive wastewater by supported polyoxometalate composite catalysts, three kinds of supported polyoxometalate composite catalysts, H3PW12O40/TiO2、H3PW12O40/TiO2(P123)and SO2-4-H3PW12O40/TiO2(P123),were prepared by the sol-gel-solvothermal route.Taking the typical organic pollutant-dinitrotoluene (DNT) in explosive wastewater as traget compound, the photocatalytic activities of the prepared catalysts in the photocatalytic degradation of DNT wastewater were investigated.The reasonable explanation for the photocatalytic activity difference between different catalysts was performed.The relationship between structure and photocatalytic properties of the catalysts was analyzed.The species of reactants and products in wastewater were identified and analyzed by gas chromatography-mass spectrometry (GC-MS) instruments.The photocatalytic degradation mechanism and mineralization degree of DNT wastewaters were studied by photocatalytic oxidation method.The results show that the degradation rate of DNT in wastewater after 4h irradiation is 98.73% when SO2-4-H3PW12O40/TiO2(P123)is used as catalyst.The reaction of methyl oxidation, nitro removal and decarboxylation occurs in the process of photocatalytic degradation of DNT wastewater.Intermediate products of degradation mainly include p-nitrobenzoic acid, m-nitrobenzoic acid, 1,3-dinitrobenzene, 2,4-di-tert-butylphenol and 2,4-dinitrobenzaldehyde.After 4h degradation, the nitrobenzene compounds were degraded completely, except for a small amount of 3,4-DNT.关键词
光催化/复合催化剂/DNT废水/炸药废水/二硝基甲苯Key words
photocatalysis/composite catalyst/dinitrotoluene wastewater/explosive wastewater/dinitrotoluene分类
军事科技引用本文复制引用
尚海茹,冯长根,孙良,甘强..复合催化剂光催化降解DNT废水及其降解机理[J].火炸药学报,2016,39(6):38-43,6.基金项目
北京理工大学校基金资助(No.20130242014 （）
No.20150242007) （）
