| 可见光响应催化剂BiVO4六角形微米棒的水热合成 |
| Hydrothermal Synthesis and Photocatalytic Property of Visible-Light-Driven BiVO4 Microrods with Hexagon Shape |
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| 摘要: 以Bi(NO3)3·5H2O和NH4VO3为原料并以聚乙烯吡咯烷酮(PVP)为模板剂通过水热法制备了BiVO4六角形微米棒晶体。采用XRD、SEM、IR、Raman、UV-Vis、光催化等对产品进行了表征和分析。结果表明，PVP辅助水热法能够合成直径125~300 nm、长度在1.0~1.6 μm内的形貌均一且结晶度高的单斜白钨矿BiVO4六角形微米棒晶体。相比BiVO4颗粒，该棒状样品的紫外-可见光吸收边发生了稍许红移，其能带隙减小至2.25 eV。光催化结果表明，添加2.0 g PVP时的BiVO4微米棒对亚甲基蓝具有最强的可见光催化降解活性，其光照射浓度为10 mg·L-1亚甲基蓝溶液2 h时的降解率达到99%。 |
| 关键词: BiVO4 水热法 六角形微米棒 光催化 |
| 基金项目: |
| Abstract: Using Bi(NO3)3·5H2O and NH4VO3 as raw materials, BiVO4 microrods with hexagon shape were synthesized by hydrothermal method with polyvinyl pyrrolidone (PVP) as template. The properties of the as-prepared samples were characterized by XRD，SEM，IR，Raman and UV-Vis spectroscopy. The results reveal that uniform and well crystallized BiVO4 hexagon-microrods in monoclinic crystal structure could be obtained with dimeter of 125~300 nm and length of 1.0~1.6 μm via a hydrothermal route assited by PVP. Compared with BiVO4 particles, the above obtained microrods by 2.0 g PVP show a small red shift in the absorption band and its narrowed band gap(2.25 eV). The catalytic results indicate that the photodegradation rate for methylene blue could reach 99% with 10 mg·L-1 solution of methylene blue under visible-light irradiation for 2 h. |
| Keywords: BiVO4 hydrothermal synthesis hexagon-microrod photocatalysis |
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| 陈 渊,刘国聪,杨家添,韦庆敏.可见光响应催化剂BiVO4六角形微米棒的水热合成[J].无机化学学报,2011,27(6):1059-1064. |
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