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化学学报
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化学学报 ›› 2004, Vol. 62 ›› Issue (12): 1134-1138. 上一篇    下一篇

研究论文

纳米WO3粉体的制备与光催化活性研究

吴玉琪, 吕功煊, 李树本   

  1. 中国科学院兰州化学物理研究所, 羰基合成与选择氧化国家重点实验室, 兰州, 730000
  • 投稿日期:2003-08-15 修回日期:2003-12-16 发布日期:2014-02-17
  • 通讯作者: 吕功煊,E-mail:gxlu@ns.lzb.ac.cn;Tel:0931-4968178;Fax:0931-4968178. E-mail:gxlu@ns.lzb.ac.cn
  • 基金资助:
    国家重点基础研究专项经费(Nos.2003CB214500,G200000264)和国家自然科学基金(No.90210027)资助项目.

Study of Preparation and Photocatalytic Activity of Nanosized WO3 Powder

WU Yu-Qi, LÜ Gong-Xuan, LI Shu-Ben   

  1. State Key Laboratory for Oxo Synthesis and Selective Oxidation, Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, Lanzhou 730000
  • Received:2003-08-15 Revised:2003-12-16 Published:2014-02-17

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报道了以钨酸钠和盐酸为主要原料,通过气液反应制备纳米WO3粉体光催化剂的新方法.在XPS,XRD,TEM等手段对催化剂进行了表征的基础上,又讨论了焙烧温度和乙醇加入量对催化剂粒度大小以及光催化活性的影响.同时对纳米WO3粉体催化剂的光催化重整乙醇制氢反应活性进行了研究,观察了产氢效率和光电化学行为.研究结果表明,气液反应法是一种简单有效的制备纳米WO3粉体催化剂的方法,并显示出较好的光催化活性;该方法所得的三氧化钨粉末粒子平均直径在100 nm以下;钨酸钠溶液中乙醇加入量对三氧化钨粉末粒子的尺寸和分散性都有影响,随着乙醇量的增加,粒子尺寸减小,且分散性较好.焙烧温度引起的WO3粒子晶体结构的变化会导致光氧化还原电位变化,是引起光催化活性差异的主要原因.

关键词: 纳米WO3, 光催化活性, 光催化剂制备

The nanosized WO3 powders have been prepared by method of gas-liquid reaction between aqueous Na 2WO 4 and HCl in this work. The NMR, XRD and XPS techniques were used to characterize the catalyst. And the effects of calcination temperature and ethanol concentration on the particle size and photocatalytic activity of the photocatalysts were discussed in detail. The photoelectrochemical actions of WO3 powders were studied by cyclic-voltammetry method as well. It was showed that gas-liquid reaction method is a simple method for nano-sized WO3 powder preparation. The size of WO3 powders is less than 100 nm. The beneficial effects of ethanol concentration on controlling WO3 powder size and particle dispersity were found, and the negative effects of higher calcination temperature on that were also indicated.

Key words: nanosized WO3 powder, photocatalytic activity, photocatalyst preparation