WO_3/N-TiO_2异质节可见光催化降解亚甲基蓝
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摘要
以尿素为氮源,采用溶胶凝胶法制备N掺杂TiO_2,然后与钨酸铵混合研磨,通过高温焙烧的方法原位制备WO_3复合N掺杂TiO_2的异质节光催化材料。分别采用X射线衍射(XRD)、紫外-可见分光光度计(UV-Vis)对样品进行分析,考察样品的光吸收阈值变化。以亚甲基蓝为降解底物,考察了样品的可见光催化处理染料废水效果,结果表明,原位制备的WO_3和N掺杂TiO_2异质节光催化材料对亚甲基蓝表现出良好的可见光催化活性。
Using urea as th e nitrogen source,N-doped titania has been prepared by a sol-gel method. Then,it is mixed and ground with ammonium tungstate. Furthermore,the WO_3/N-TiO_2 heterostructure photo-catalytic material is in situ synthetized by a high temperature roasing method. The change of light absorption threshold values of the sample is investigated by means of XRD and UV-Vis. Using methylene blue as degradation substrate,the effect of the visiblelight photo-catalytic treatment on dyeing wastewater of the sample is also investigated. The results show that the in situ synthesized WO_3 and N-doped TiO_2 heterostructure photo-catalytic material exhibits favorable visible-light induced photo-catalytic activity for methylthionine blue.
Using urea as th e nitrogen source,N-doped titania has been prepared by a sol-gel method. Then,it is mixed and ground with ammonium tungstate. Furthermore,the WO_3/N-TiO_2 heterostructure photo-catalytic material is in situ synthetized by a high temperature roasing method. The change of light absorption threshold values of the sample is investigated by means of XRD and UV-Vis. Using methylene blue as degradation substrate,the effect of the visiblelight photo-catalytic treatment on dyeing wastewater of the sample is also investigated. The results show that the in situ synthesized WO_3 and N-doped TiO_2 heterostructure photo-catalytic material exhibits favorable visible-light induced photo-catalytic activity for methylthionine blue.
引文
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[3]Xiang Qun,Meng G F,Zhao Hongbin,et al.Au nanoparticle modified WO3nanorods with their enhanced properties for photocatalysis and gas sensing[J].The Journal of Physical Chemistry C,2010,114(5):2049-2055.
[4]Su Jinzhan,Feng Xinjian,Sloppy J D,et al.Vertically aligned WO3nanowire arrays grown directly on transparent conducting oxide coated glass:synthesis and photoelectrochemical properties[J].Nano Letters,2010,11(1):203-208.
[5]Yu Jiaguo,Yu Huogen,Cheng Bei,et al.Effects of calcination temperature on the microstructures and photocatalytic activity of titanate nanotubes[J].Journal of Molecular Catalysis A:Chemical,2006,249(1/2):135-142.
[6]Szilágyi I M,Fórizs B,Rosseler O,et al.WO3photocatalysts:Influence of structure and composition[J].Journal of Catalysis,2012,294:119-127.
[7]Cao Jing,Luo Bangde,Lin Haili,et al.Thermodecomposition synthesis of WO3/H2WO4heterostructures with enhanced visible light photocatalytic properties[J].Applied Catalysis B:Environmental,2012,111/112:288-296.
[8]Coronado D R,Gattorno G R,Pesqueira M E,et al.Phase-pure Ti O2nanoparticles:anatase,brookite and rutile[J].Nanotechnology,2008,19(14):145605.
[9]Xu Hui,Yan Jia,Xu Yuanguo,et al.Novel visible-light-driven Ag X/graphite-like C3N4(X=Br,I)hybrid materials with synergistic photocatalytic activity[J].Applied Catalysis B:Environmental,2013,129:182-193.
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