钼酸铋基复合氧化物的水热合成及光催化性能研究

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1、北京工业大学博士学位论文钼酸铋基复合氧化物的水热合成及光催化性能研究姓名：李红花申请学位级别：博士专业：材料物理与化学指导教师：汪浩20090501北京-1：业大学。I学博}j学何论文表面积等方面详细讨论了光催化性能差异的原因。水热条件下，当原始Bi／Mo配比从2／3到2．4／1，在pH等于7和9时，都获得了纯相的y-Bi2M006。但此过程中拉曼峰发生了明显的频移，光催化性能发生了较大变化。深入分析了拉曼频移、结构变化和光催化性能之间的关系。通过低温水热法，合成了无限互溶的Bi2Mol叫W二06@=0～1．0)固溶体，避免了高温相

2、变的发生。研究了该系列化合物晶格参数、晶粒尺寸、带隙和光催化性能的变化，为进一步提高钼酸铋可见光光催化性能提供了途径。关键词钼酸铋；水热合成；可见光；光催化ⅡABSTRACTPollutionabatementusingsemiconductormaterialsasphotocatalystsundersunlighthasbeenasubjectofgreatinterest．Ithasgreatsignificanceofprotectingtheenvironment，keepingecologybalanceandreal

3、izingsustainabledevelopment．Atpresent，manysemiconductoroxides，suchasTi02，SrTi03，NaTa03havebeenproventobethebenchmarkphotocatalystsforeffectivedegradationoforganicpollutants．However,sincetheirbandgapsarelarge，thesephotocatalystscannotabsorbvisiblelightandonlymakeuseof5％

4、ofthesolarbeamthatCanreachtheearth．Ontheotherhand，t11etraditionalvisible．responsephotocatalystssuchasCdSandCdSeareeasilytoerodeunderphotocatalyticconditions，whichintroduceadditionalpollutants．Therefore，thesearchfornovelmaterialsinheterogeneousphtotocatalysiswhichCanabs

5、orbvisiblelighthasbeenamatterofinterestinthelatestyears．Bismuthmolybdateshavebeenstudiedextensivelyasamodelcatalystsystem．Besidesthecatalyticapplication，bismuthmolybdatesareinterestingbecauseoftheiruniquephysicalpropertieswithotherpotentialtechnicalapplicationssuchasio

6、nconductors，acousto—opticalmaterials，photoconductors，andgassensors．Recently，bismuthmolybdateshavealsobeendemonstratedtoexhibitvisible．1ightdrivenphotocatalyticactivity．However，y-Bi2M006wouldundergoaf1．1rtheTtransformationtothey'-Bi2M006phaseabove600oC．So，synthesisofbis

7、muthmolyrbdatesatlowtemperaturewouldleadtofar-rangingapplication．Atpresent，theinvestigationontheirphotocatalyticpropertieshasbeenfocusedony-Bi2M006．Butthereislittlesystemicstudyontheformationmechanismunderhydrothermalconditionsandthevisible-lightphotocatalyticactivityo

8、fy-Bi2M006towardthedegradationoforganiccontaminants．Ontheotherhand，tothebestofourknowledge，littleattentionhasbeenpaid