Efficient Photocatalytic Removal of NO in Indoor Air with Hierarchical Bismuth Oxybromide Nanoplate Microspheres under Visible Light
Efficient Photocatalytic Removal of NO in Indoor Air with Hierarchical Bismuth Oxybromide Nanoplate Microspheres under Visible Light
复制标题
可见光下分级溴化铋纳米板微球高效光催化去除室内空气中的NO
DOI：
10.1021/es9004366
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发表时间：
2009-06-01
影响因子：
11.4
通讯作者：
Zhang, Lizhi
中科院分区：
文献类型：
--
作者：
Ai, Zhihui;Ho, Wingkei;Zhang, Lizhi
在可见光照射下，采用分级结构溴氧化铋（BiOBr）纳米片微球对室内空气中NO进行了去除研究。以硝酸铋和十六烷基三甲基溴化铵为前驱体，采用非水溶胶-凝胶法制备了BiOBr微球。在可见光照射下（λ> 420 nm）降解400 part-per-billion水平的NO时，这是室内空气质量的典型浓度，这些非水溶胶-凝胶合成的分级BiOBr微球表现出比化学沉淀合成的对应物BiOBr块体粉末和Degussa TiO 2 P25以及C掺杂的TiO 2更优越的上级光催化活性。非水溶胶-凝胶法合成的BiOBr微球具有优异的催化活性和长期活性，这归因于其特殊的分级结构，有利于NO氧化中间体和最终产物的扩散。离子色谱分析结果表明，BiOBr微球在气相中光氧化NO的过程中，表面生成了硝酸。研究结果表明，非水溶胶-凝胶法合成的BiOBr纳米片微球是一种很有前途的室内空气净化光催化材料。
In this study, hierarchical bismuth oxybromide (BiOBr) nanoplate microspheres were used to remove NO in indoor air under visible light irradiation. The BiOBr microspheres were synthesized with a nonaqueous sol-gel method by using bismuth nitrate and cetyltrimethyl ammonium bromide as the precursors. On degradation of NO under visible light irradiation (lambda > 420 nm) at 400 part-per-billion level, which is typical concentration for indoor air quality, these nonaqueous sol-gel synthesized hierarchical BiOBr microspheres exhibited superior photocatalytic activity to the chemical precipitation synthesized counterpart BiOBr bulk powder and Degussa TiO2 P25 as well as C doped TiO2. The excellent catalytic activity and the long-term activity of nonaqueous sol-gel synthesized BiOBr microspheres were attributed to their special hierarchical structure, which was favorable for the diffusion of intermediates and final products of NO oxidation. Ion chromatograph results confirmed that nitric acid was produced on the surface of BiOBr microspheres during the photooxidation of NO in gas phase. This work suggests that the nonaqueous sol-gel synthesized BiOBr nanoplate microspheres are promising photocatalytic materials for indoor air purification.