Study on Preparation of W,N Codoped TiO2 Photocatalyst by Low-temperature Sol Process
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摘要: 以钛酸四正丁酯为前驱体，硝酸铵和钨酸铵为掺杂源，利用低温溶胶法直接制备了纳米级钨、氮共掺杂二氧化钛粉体。通过XRD、SEM、IR、XPS、GTA等测试手段对样品进行表征，结果表明：共掺杂TiO2粉体为锐钛矿型，呈球状颗粒，粒径为8.9 nm，600℃内稳定性好，禁带宽度2.86 eV，光响应迁移到可见光范围。以氙灯模拟太阳光降解甲基橙溶液，光照60 min，光催化剂粉体的降解率达到94%以上，与P25相比有明显提高，具有良好的光降解性能。Abstract: Taking tetra-n-butyl titanate as precursor and ammonium nitrate and ammonium tungstate as codoping sources,nanoscale W,N codoped TiO2 powder is directly prepared by low-temperature sol process. The samples are characterized by XRD,SEM,IR,XPS,and GTA. The results show that the spherical codoped photocatalyst powder is anatase TiO2 with particle sizes of 8.9 nm and good stability below 600℃; the energy gap of the powder is 2.86 eV and the photoresponse moves to the range of visible light. Sunlight is replaced by xenon lamp to degrade methyl orange solution for 60 min,and the degradation rate of the photocatalyst powder reach to 94% or above,which shows a noticeably improved performance than that of P25.
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Key words:
- low-temperature sol process /
- titanium dioxide /
- photocatalysis /
- codope
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