New Insights into Bi2WO6 Properties as a Visible-Light Photocatalyst
New Insights into Bi2WO6 Properties as a Visible-Light Photocatalyst
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DOI：
10.1021/jp4048192
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发表时间：
2013-10
影响因子：
3.7
通讯作者：
T. Saison;P. Gras;N. Chemin;C. Chanéac;O. Durupthy;V. Brezová;C. Colbeau‐Justin;J. Jolivet
中科院分区：
文献类型：
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作者：
T. Saison;P. Gras;N. Chemin;C. Chanéac;O. Durupthy;V. Brezová;C. Colbeau‐Justin;J. Jolivet
钨酸铋在可见光下具有诱人的光催化性能。更好地理解这一良好活动的起源应该有助于对其进行控制和优化。以微波辅助合成的铋系氧化物为光催化剂，加入十二烷基硫酸钠作为粒度调节剂，提高了催化剂对不同污染物的光催化活性。电子顺磁共振研究表明，钨酸铋在水溶液中能产生羟基自由基，但不产生超氧阴离子。相对于二氧化钛的催化效率可能与产生的激子数量的不同、激子在半导体中作为空穴和电子的寿命以及价带和导带位置有关。
Bismuth tungstate has attractive photocatalytic properties under visible light. A better understanding of the origin of that good activity should allow its control and its optimization. An improved photocatalytic activity to different pollutants was obtained using bismuth-based oxide obtained by microwave-assisted synthesis combined with the addition of sodium dodecylsulfate as a size tailoring agent. It is shown using electron paramagnetic resonance that bismuth tungstate is able to generate hydroxyl radicals in aqueous aerated solution, but no superoxide radical anions are formed. The catalytic efficiency relative to TiO2 could be associated to differences in the number of excitons generated, to their lifetimes as holes and electrons in the semiconductor, and to valence and conduction band positions.