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时间:2020-03-27
《空心微珠光催化降解联苯胺.pdf》由会员上传分享,免费在线阅读,更多相关内容在行业资料-天天文库。
1、化工环保ENVIRONMENTALPROTECT10NOFCHEMICALINDUSTRY’41‘2016年第36卷第1期H4SiW12ojrioj~,C,微珠光催化降解联苯胺王晶博,张静,冯宇,柳敏,黄卫红(1.海南省环境科学研究院,海南海口571126;2.北京市环境保护科学研究院固体废物污染防治研究所,北京100037;3.江苏大学环境与安全工程学院,江苏镇江212013)[摘要]采用复合型光催化剂HSiW:Oo/TiO/空心微珠(cenospheres)光催化降解联苯胺,考察了联苯胺降解效果的影响因素,
2、并运用FTIR和Gs—MS技术分析了联苯胺光催化降解过程的主要中间产物,探讨了联苯胺可能的降解路径。实验结果表明:以125W中压汞灯为光源,在溶液pH为6_3、初始联苯胺质量浓度为10mg/L的条件下光反应240min,联苯胺降解率达78%,~LTiO2/空心微珠提高了24百分点;H4SiW。0dTiO/空心微珠光催化降解联苯胺符合表观一级动力学特征,且反应速率常数随初始联苯胺质量浓度的增加而减小;HSiW:Oo/TiO:/空心微珠具有较好的稳定性,易于分离,可重复利用;联苯胺光催化降解过程的主要中间产物为4一
3、氨基联苯、4一氨基苯酚、对苯二酚和1,4一苯醌。[关键词]硅钨酸/二氧化钛/空心微珠;光催化;联苯胺;降解[中图分类号]X703.5[文献标志码]A[文章编号]1006—1878(2016)01—0041—06[DOI]10.3969/j.issn.1006—1878.2016.01.009PhotocatalyticdegradationofbenzidineonH4SiW120加,riO2/eenospheresWangJingbo,ZhangJing,FengYu,LiuMin,HuangWeihong(
4、1.HainanResearchAcademyofEnvironmentalSciences,HaikouHainan571126,China;2.SolidWastePollutionControlDivision,BeijingMunicipalResearchInstituteofEnvironmentalProtection,Beijing100037.China;3.SchoolofEnvironmentandSafetyEngineering,JiangsuUniversity,ZhenjiangJ
5、iangsu212013,China)Abstract:BenzidinewasdegradedusingthecompositephotocatalystH4SiW12O40/TiOJcenospheres.Thefactorsafectingthedegradationeficiencywereinvestigated.TheintermediatesintheprocessofbenzidinephotocatalyticdegradationwerecharacterizedbyFT1RandGC-MS
6、technology,andthepossiblepathwayofbenzidinephotocatalyticgradationwasproposed.Theexperimentalresultsshowthat:Undertheconditionsofusinga125Wmediumpressuremercurylampaslightsource,solutionpH6.3,initialbenzidinemassconcentration10mandreactiontime240min,thedegra
7、dationrateofbenzidinereaches78%,whichishigherthanthatofusingYi02/cenospheresphotocatalystby24percent;ThephotocatalyticdegradationofbenzidineonH4SiW12O4o/TiO2/cenospheresfitsmepseudo—fwst-orderkinetics,andthereactionrateconstantdecreases、viththeincreasesofini
8、tialbenzidinemassconcentration;I-hSiWl2o40/TiO2/cenospheresshowsgoodstability,andiseasytobeseparatedandreused;Themajorintermediatesintheprocessofbenzidinephotocatalyticdegradationareidentifiedas
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