氯氧化铋催化剂的电子结构调控及其光催化性能研究

以不同Bi/Cl摩尔比例为原料设计合成了一系列BiOCl半导体催化材料。扫描电子显微镜、XRD衍射峰拟合等分析结果显示，Bi/Cl比例的改变对BiOCl的形貌、表面结构、微观电子结构均具有一定的调控作用。以Bi/Cl = 1 : 1为原料合成的BiOCl光催化剂具有最窄的带隙值（Eg=3.18 eV），使得其具有较强的的光响应能力。光催化去除罗丹明B（RhB）结果表明，随着Bi/Cl摩尔比例的减小，BiOCl的催化性能呈现先增强后减弱的趋势。Bi/Cl = 1 : 1样品具有最优的催化活性，源于其较优异的光吸收性能以及特殊的表面特性。光催化机理研究表明，光催化去除RhB的过程中，起作用的活性物质主要为光生电子、空穴以及半导体表面产生的超氧自由基。

Study on the Electronic Structure Modulation and Photocatalytic Performance of Bismuth Oxychloride Photocatalysts

A series of BiOCl semiconductor photocatalysts was obtained by using different molar ratio Bi/Cl as raw materials. The results of SEM, refined XRD and other analysis results demonstrated that the morphologies, surface properties and micro-electronic structures of BiOCl were regulated by changing Bi/Cl. The BiOCl sample prepared by Bi/Cl = 1 : 1 owned a narrowest band gap energy of 3.18 eV and the strongest absorption property. The results of photocatalytic RhB degradation cleared that the photocatalytic performance of BiOCl increased at first and then decreased as the Bi/Cl decreased. The BiOCl photocatalyst prepared by Bi/Cl = 1 : 1 achieved the optimal photocatalytic activity towards RhB, which might be originated from its superior light absorption performance and special surface property. Additionally, the quenching effects of different scavengers suggested that the dominated active species in the photodegradation reaction were photogenerated electrons, holes and ?O2-.