Synthesis of Yb3+/Ho3+ co-doped Bi2WO6 upconversion photocatalyst with highly improved visible light photocatalytic activity
Synthesis of Yb3+/Ho3+ co-doped Bi2WO6 upconversion photocatalyst with highly improved visible light photocatalytic activity
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DOI：
10.1016/j.catcom.2017.04.021
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发表时间：
2017-07-05
影响因子：
3.7
通讯作者：
Liu, Guishan
中科院分区：
文献类型：
--
作者：
Li, Hong;Hao, Hongshun;Liu, Guishan
采用简单的水热法和煅烧工艺合成了Yb 3 +/Ho 3+共掺杂Bi 2 WO 6（Yb 3 +/Ho 3 +-（BiWO 6）-W-2），作为一种新型可见光催化剂。采用多种分析方法对合成的Yb 3 +/Ho 3 +-Bi 2 WO 6样品进行了表征。结果表明，当Yb 3 +/Ho 3+摩尔比为5时，BIW-5的光催化活性最高。可见光照射20 min，RhB降解率达99.8%，其光催化活性的提高主要归因于Yb 3 +/Ho 3+离子与Bi 2 WO 6之间通过红外-可见光上转换进行的有效能量传递以及通过掺杂Yb 3 +/Ho 3+离子降低了光生电子-空穴对的结合速率。因此，本研究可能提供一个更好的方法，以获得稳定的上转换光催化剂，大大提高了活性。
As a novel visible-light-driven photocatalyst, Yb3+/Ho3+ co-doped Bi2WO6 (Yb3+/Ho3+-(BiWO6)-W-2) was synthesized via a simple hydrothermal method and subsequent a calcination process. The as-synthesized Yb3+/Ho3+-Bi2WO6 samples were characterized by various analytical methods. The BIW-5 (Yb3+/Ho3+ molar ratios is 5) sample showed the highest photocatalytic activity. The RhB was degraded (99.8%) under visible light irradiation in 20 min. The improved photocatalytic activity could be attributed to the efficient energy transfer between Yb3+/Ho3+ and Bi2WO6 via infrared to visible upconversion and the reduced combination rate of photogenerated electron-hole pairs through doping Yb3+/Ho3+ ions. Therefore, this study may provide a better method to obtain stable upconversion photocatalyst with greatly improved activity.