Preparation of N-Doped Bi2WO6 Microspheres for Efficient Visible Light-Induced Photocatalysis
Preparation of N-Doped Bi2WO6 Microspheres for Efficient Visible Light-Induced Photocatalysis
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N掺杂Bi2WO6微球的制备用于高效可见光诱导光催化
DOI：
10.1007/s40195-013-0009-z
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发表时间：
2014-01
影响因子：
3.5
通讯作者：
Wan, Junmin
中科院分区：
文献类型：
--
作者：
Wang, Xiaohong;Jiang, Tengteng;Chen, Wenxing;Wan, Junmin
以尿素为氮源，采用水热法制备了高可见光活性的n掺杂钨酸铋（Bi2WO6）光催化剂。采用x射线衍射、扫描电镜、比表面积、光电流分析、UV-Vis漫反射光谱等方法对制备的n掺杂Bi2WO6样品进行了表征。通过可见光光催化降解罗丹明B （rhodamine B, RhB）溶液，考察了其光催化活性。通过活性物质捕获实验分析了光催化机理，发现在可见光照射下，n掺杂Bi2WO6水溶液中的主要活性物质为空穴，而不是·OH和O2•−。在H2O2的辅助下，H2O2与导带电子反应生成更多的羟基自由基，进一步提高了降解RhB的光催化活性。
The N-doped bismuth tungstate (Bi2WO6) photocatalysts with high visible light activity were prepared by the hydrothermal method using urea as a nitrogen source. The as-prepared N-doped Bi2WO6 samples were characterized by X-ray diffraction, scanning electron microscopy, specific surface area, photocurrent analysis, and UV–Vis diffuse reflectrance spectroscopy. The photocatalytic activity was evaluated by photocatalytic degradation of rhodamine B (RhB) solution under visible light irradiation. The photocatalytic mechanisms were analyzed by active species trapping experiments which revealed that the holes were the main active species of N-doped Bi2WO6 products in aqueous solution under visible light irradiation, rather than ·OH and O2•−. With the assistance of H2O2, the photocatalytic activity for degradation of RhB could be further improved because H2O2 reacted with conduction band electrons to generate more hydroxyl radicals.
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