具有可见光活性的Na掺杂ZnO光催化剂的制备研究
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摘要
以二水乙酸锌为锌源、氢氧化钠为沉淀剂和钠源,采用溶液沉淀法和煅烧处理合成了具有可见光活性的Na掺杂ZnO光催化剂。采用X射线衍射仪、扫描电子显微镜及紫外-可见漫反射光谱仪对合成的催化剂样品进行表征。结果表明,Na掺杂ZnO光催化剂的带隙为3.1eV,具有可见光吸收活性,添加聚乙二醇合成的催化剂样品经550℃煅烧后表现出较高的活性,在光照时间70min内对亚甲基蓝的降解率达到了96%。
Sodium-doped zinc oxide photocatalysts with visible-light activity were synthesized by aprecipitation method and subsequent calcination process using zinc acetate dihydrate as the source of zinc,and sodium hydroxide as the precipitant and the source of sodium.The synthesized samples were characterized by X-ray diffraction,scanning electron microscopy and UV-Vis diffuse reflectance.The results indicated that the sodium-doped zinc oxide with a band gap of 3.1 eV had visible light activity,and that the product synthesized with polyethylene glycol additive and subsequently calcined at 550℃showed a higher photocatalytic activity and the degradation rate of 96%for methylene blue with 70 min.
Sodium-doped zinc oxide photocatalysts with visible-light activity were synthesized by aprecipitation method and subsequent calcination process using zinc acetate dihydrate as the source of zinc,and sodium hydroxide as the precipitant and the source of sodium.The synthesized samples were characterized by X-ray diffraction,scanning electron microscopy and UV-Vis diffuse reflectance.The results indicated that the sodium-doped zinc oxide with a band gap of 3.1 eV had visible light activity,and that the product synthesized with polyethylene glycol additive and subsequently calcined at 550℃showed a higher photocatalytic activity and the degradation rate of 96%for methylene blue with 70 min.
引文
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[2]Liu Y,Kang Z H,Chen Z H,et al.Synthesis,characterization and photocatalytic application of different ZnO nanostructures in array configurations[J].Crystal Growth &Design,2009,9(7):3222-3227.
[3]Lai Y,Ming M,Yu Y.One-step synthesis,characterizations and mechanistic study of nanosheets-constructed fluffy ZnO and Ag/ZnO spheres used for rhodamine B photodegradation[J].Applied Catalysis B Environmental,2010,100(3/4):491-501.
[4]武广利,赵晓华,李萌,等.溶胶凝胶辅助水热可控合成ZnO不同形貌分级结构光催化剂[J].无机化学学报,2015,31(1):61-68.
[5]Zhang Q,Liu J K,Wang J D,et al.Atmospheric self-induction synthesis and enhanced visible light photocatalytic performance of Fe3+doped Ag-ZnO mesocrystals[J].Industrial &Engineering Chemistry Research,2014,53(34):13236-13246.
[6]Wang L W,Wu F,Tian D X,et al.Effects of Na content on structural and optical properties of Na-doped ZnO thin films prepared by sol-gel method[J].Journal of Alloys and Compounds 2015,623:367-373.
[7]丁士文,张绍岩,刘淑娟,等.直接沉淀法制备纳米ZnO及其光催化性能[J].无机化学学报,2002,18(10):1015-1019.
[8]Zhang L,Yin L,Wang C,et al.Sol-gel growth of hexagonal faceted ZnO prism quantum dots with polar surfaces for enhanced photocatalytic activity[J].ACS Applied Materials &Interfaces,2010,2(6):1769-1733.
[9]付三玲,蔡淑珍,张晓军,等.水热法制备ZnO晶体及纳米材料研究进展[J].人工晶体学报,2006,35(5):1016-1021.
[10]Chandrappa K G,Venkatesha T V.Electro chemical synthesis and photocatalytic property of Zinc oxide nanoparticles[J].Nano-Micro Letters,2012,4(1):14-24.
[11]Liang H Q,Pan L Z,Liu Z J.Synthesis and photoluminescence properties of ZnO nanowires and nanorods by thermal oxidation of Zn precursors[J].Materials Letters,2008,62(12/13):1797-1800.