Enhanced photoinduced stability and photocatalytic activity of AgBr photocatalyst by surface modification of Fe(III) cocatalyst
Enhanced photoinduced stability and photocatalytic activity of AgBr photocatalyst by surface modification of Fe(III) cocatalyst
复制标题
通过 Fe(III) 助催化剂的表面修饰增强 AgBr 光催化剂的光致稳定性和光催化活性
DOI：
10.1016/j.apcatb.2013.06.023
复制
发表时间：
2014-01-01
影响因子：
22.1
通讯作者：
Yu, Jiaguo
中科院分区：
文献类型：
--
作者：
Yu, Huogen;Xu, Linli;Yu, Jiaguo
最近，AgBr材料被证明是一种新型高效的可见光光催化剂，可用于分解各种有机化合物。然而，由于其优异的感光性能，AgBr相在可见光照射下不可避免地分解成金属Ag，导致其表面结构明显破坏。本研究采用浸渍法将Fe(III)助催化剂接枝到AgBr颗粒表面形成Fe(III)/AgBr光催化剂，并通过可见光照射下甲基橙溶液的光催化脱色评价其光催化性能。研究发现Fe(III)簇可以作为一种新型有效的助催化剂，不仅可以提高AgBr光催化剂的光催化活性，而且可以显着增强光敏AgBr的光致稳定性。在表面涂覆Fe(III)助催化剂（8.2 at.%）后，AgBr光催化剂的光催化活性即使在经过5个光催化反应循环后仍可大幅提高73%。同时，通过Fe(III)助催化剂的表面负载，AgBr的分解量可以从8.8 at.%显着降低至2.9 at.%。根据实验结果，提出了 Fe(III) 助催化剂增强 AgBr 光催化活性和光诱导稳定性的可能机制。与众所周知的贵金属助催化剂（例如Pt、Au、Ag）相比，目前丰富且廉价的Fe（III）助催化剂可以被视为智能设计和开发各种潜在应用中的高性能光催化材料的理想助催化剂之一。 (C) 2013 Elsevier B.V. 保留所有权利。
Recently, AgBr material was demonstrated to be a new and efficient visible-light photocatalyst for the decomposition of various organic compounds. Owing to its excellent photosensitive properties, however, AgBr phase is unavoidably decomposed into metallic Ag under visible-light irradiation, resulting in an obvious destroy of its surface structure. In this study, Fe(III) cocatalyst was grafted on the surface of AgBr particles to form Fe(III)/AgBr photocatalysts by an impregnation method and their photocatalytic performance was evaluated by the photocatalytic decolorization of methyl orange solution under visible-light irradiation. It was found that the Fe(III) cluster could act as a new and effective cocatalyst not only to improve the photocatalytic activity of AgBr photocatalyst, but also remarkably enhance the photoinduced stability of photosensitive AgBr. After surface coating by Fe(III) cocatalyst (8.2 at.%), the photocatalytic activity of AgBr photocatalyst can be greatly improved by a factor of 73% even after five cycles of photocatalytic reactions. Simultaneously, the decomposed amount of AgBr can be significantly deduced from 8.8 at.% to 2.9 at.% by the surface loading of Fe(III) cocatalyst. On the basis of the experimental results, an possible mechanism for the enhanced photocatalytic activity and photoinduced stability of AgBr by Fe(III) cocatalyst was proposed. Compared with the well-known noble metal cocatalysts (e.g., Pt, Au, Ag), the present abundant and cheap Fe(III) cocatalyst can be regarded as one of the ideal cocatalyst for the smart design and development of high-performance photocatalytic materials in various potential applications. (C) 2013 Elsevier B.V. All rights reserved.