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时间:2020-07-30
《铋系半导体光催化材料_李二军.pdf》由会员上传分享,免费在线阅读,更多相关内容在教育资源-天天文库。
1、第22卷第12期化学进展Vol.22No.122010年12月PROGRESSINCHEMISTRYDec.,2010*铋系半导体光催化材料李二军陈浪章强李文华尹双凤(湖南大学化学化工学院长沙410082)摘要近年来,铋系半导体材料因其在可见光辐照下对难降解有机物具有良好的催化作用而成为新型光催化材料的研究热点之一。本文综述了国内外铋系光催化剂的研究动态和主要成果。铋系光催化剂在可见光范围内有明显的吸收,具有较好的光催化活性。此外,大多数铋系光催化剂在反应过程中具有较高的稳定性。通过改进制备方法、掺杂负载、构建
2、异质结等技术,可以有效提高铋系半导体材料的可见光吸收性能或抑制光生电子和空穴的复合,从而进一步提高其光催化性能。尽管铋系光催化剂由于其导带位置比氢的氧化还原电位低,但是通过设计合成新的能带结构可使其满足氧化和还原水的能带要求,从而实现铋系光催化剂在光解水制氢中的应用。最后,对铋系光催化剂未来的发展趋势进行了展望,并强调针对特殊用途和结合量化计算方法对开发新型铋系光催化剂的重要性。关键词铋半导体光催化+中图分类号:O614.5;O643.322文献标识码:A文章编号:1005-281X(2010)12-2282-08
3、Bismuth-ContainingSemiconductorPhotocatalystsLiErjunChenLangZhangQiangLiWenhuaYinShuangfeng(CollegeofChemistryandChemicalEngineering,HunanUniversity,Changsha410082,China)AbstractBismuth-containingsemiconductormaterialsasanovelkindofphotocatalystshaveattracte
4、dmuchmoreattentionduetotheirhighcatalyticactivitiestowardsthedegradationoforganicwastesundervisiblelightirradiation.ThispapersummarizestheresearchachievementsonBi-containingsemiconductorphotocatalysts(e.g.,bismuthoxide,bismuthtitanate,bismuthtungstate,bismuthv
5、anadate,bismuthoxyhalide,andsoon).AmongthereportedBi-containingphotocatalysts,bismuthtungstateandbismuthvanadateareveryattractive.Especially,itisshownthatmanyBi-containingsemiconductorphotocatalystspossessessignificantlystrongeropticalabsorptionpropertiesandhi
6、gherphotocatalyticactivitiesthancommercialTiO(P25)undervisiblelightirradiation.2Moreover,mostofBi-containingsemiconductorphotocatalystshavegoodstability.Ontheotherhand,theopticalabsorptionabilitiesofBi-containingsemiconductorphotocatalystscanbeobviouslyimprove
7、dbychemicalmodificationorconstructingheterostructure.Additionally,althoughthepositionofconductionbandofcommonBi-containingphotocatalystsislowerthantheredoxpotentialofhydrogen,manyBi-containingsemiconductormaterialscanbeusedaswatersplittingcatalystsbychemicalmo
8、dification.WetriedtoclarifytherelationshipbetweenthestructureandcatalyticperformanceoftheBi-containingphotocatalysts.ProspectonthedevelopmentofBi-containingsemiconductorphotocataly
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