Visible Light Photocatalysis of BiOI and Its Photocatalytic Activity Enhancement by in Situ Ionic Liquid Modification
Visible Light Photocatalysis of BiOI and Its Photocatalytic Activity Enhancement by in Situ Ionic Liquid Modification
复制标题
BiOI的可见光光催化及其原位离子液体修饰增强其光催化活性
DOI：
10.1021/jp2042069
复制
发表时间：
2011-07-28
影响因子：
3.7
通讯作者：
Zhang, Lizhi
中科院分区：
文献类型：
--
作者：
Wang, Yunan;Deng, Kejian;Zhang, Lizhi
本研究详细研究了BiOI的光催化机理，证明通过离子液体[Bmim]I（碘化1-丁基-3-甲基咪唑）的原位修饰可以大大提高BiOI的光催化活性。离子液体改性BiOI（IL-BiOI）是通过硝酸铋与[Bmim]I在水中在70 °C下反应来制备的，其中离子液体既可以作为碘源又可以作为表面改性剂。在可见光照射下（λ > 420 nm），IL-BiOI光催化剂对橙子（MO）的降解效果上级未加[Bmim]I的光催化剂。系统研究了离子液体改性对光催化活性的影响。结果表明，IL修饰可以将光致电子捕获在BiOI的导带，抑制光致电子-空穴对的复合，从而提高其光催化降解有机物的活性。
In this study, we investigate the photocatalysis mechanism of BiOI in detail and therefore demonstrate that the photocatalytic activity of BiOI could be enhanced greatly by in situ modification of an ionic liquid [Bmim]I (1-buty-3-methylimidazolium iodide). The ionic liquid modified BiOI (IL-BiOI) was prepared by reacting bismuth nitrate with [Bmim]I in water at 70 °C, where the ionic liquid could act as both iodine source and surface modified agent. On degradation of methyl orange (MO) under visible light irradiation (λ > 420 nm), IL-BiOI photocatalyst exhibited superior photocatalytic activity to the unmodified counterpart synthesized in the absence of [Bmim]I. The effects of ionic liquid modification on the photocatalytic activity enhancement were systematically investigated. We found that IL modification could trap the photoexcited electron at conduction band of BiOI to inhibit the recombination of photoinduced electron–hole pairs and thus enhance its photocatalytic activity on the degradation of orga...