PW11O39Co(Ⅱ)(H2O)^5-的均相及异相体系可见光催化性能研究.pdf

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1、第3O卷第8期无机化学学报V0】．30No．82014年8月CHINESEJ0URNALOFIN0RGANICCHEMISTRY18951903PW。。o0(Ⅱ)(H2O)的均相及异相体系可见光催化性能研究华英杰徐孝南邹晓梅韩雷云吴萌王崇太(海南师范大学化学与4k5_y-学院，海1：7571158)摘要：以模型污染物罗丹明B(RhB)I~光降解为探针，评估了Keggin型钴取代杂多阴离子PWOCo(II)(H20)5一(PWCo)2~其异相体系PW，Co／I)301R的可见光催化活性，提出了光催

2、化反应的机理，同时考察了催化剂用量、溶液酸度以及溶液中PWCo和RhB的相互作用对RhB可见光催化降解速率的影响。实验结果表明，PWCo均相体系及其异相体系PWCo／D301R对RhB的可见光降解均有较高的光催化活性，但PW，Co／D301R的光催化活性更高。导致RhB降解的主要是羟基自由基与PWCo均相体系相比，在PWCo／D301R异相体系中由于PWCo与RhB的配位作用大为减弱，同时D301R对RhB具有富集作用，因而大大提高了RhB的光催化降解速率关键词：Keggin型钴取代杂多阴离子；

3、可见光催化剂；罗丹明B降解；D301R阴离子交换树脂中图分类号：0643．3文献标识码：A文章编号：1001—4861(2014)08．1895．09DOI：10．11862／CJIC．2014．250AStudyontheVisiblePhotoeatalyticPropertyofPW11o39Co(Ⅱ)(o)5_inHomogeneousandHeterOgeneOusSystemsHUAYing—JieXUXiao—NanZOUXiao—MeiHANLei-YunwuMengWANGCh

4、ong-Tai(SchoolofChemistryandChemicalEngineering,HainanNormalUniversity,Haikou571158，China)Abstract：ThevisiblephotocatalyticactivityoftheKeggin—typecobalt-substitutedheteropolyanionPWl1O39Co(n)(H20)-(PWnCo)anditsheterogeneoussystemPW1lCo／D301Rwasevalu

5、atedthroughthephotodegradationofthedyepollutantrhodamineB(RhB)asaprobe．Aphotocatalysismechanismwassuggestedandtheinfluencesofthecatalystamount，thesolutionacidityaswellastheinteractionbetweenPWl1CoandRhBwerealsoexamined．Theexperimentalresultsshowedtha

6、tbothofthehomogeneoussystemPWl1CoandtheheterogeneoussystemPWuCo／D301RhaveahighphotocatalyticactivityforthevisiblephotodegradationofRhB，butthephotocatalyticactivityofPWl1Co／D301RishigherthanthatofPWllCo，forexample，withotheridenticalconditionsittook90m

7、inforacompletedegradationofRhBwithaconcentrationof10~mmol·L～fortheformer，but50minforthelatter．ThemineralizationpercentageofRhBat120minduringdegradationis34％fortheformer，but48％forthelatter．ThehydroxylradicalsaleconsideredtoberesponsiblefortheRhBdegrad

8、ation．Comparedtothehomogeneoussystem，thephotocatalyticdegradationrateofRhBisobviouslyenhancedintheheterogeneoussystemduetotheweakenedcomplexationofPWl1CowithRhBandtheenrichmentofD301RtowardsRhB．Keywords：Keggin-typeCobalt·-substitutedheteropolyanion；v