Co-modification of F− and Fe(III) ions as a facile strategy towards effective separation of photogenerated electrons and holes
Co-modification of F− and Fe(III) ions as a facile strategy towards effective separation of photogenerated electrons and holes
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F-和 Fe(III) 离子的共修饰作为有效分离光生电子和空穴的简便策略
DOI：
10.1016/j.apsusc.2015.05.056
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发表时间：
2015-10
影响因子：
6.7
通讯作者：
Huogen Yu
中科院分区：
文献类型：
--
作者：
Xuefei Wang;Rui Yu;Ping Wang;Feng Chen;Huogen Yu
同时促进光生电子和空穴快速转移的复合助催化剂是提高半导体光催化剂光催化活性的有效策略之一。本研究采用Fe(III)离子浸渍和F-离子在TiO2表面吸附的两种湿化学法，制备了F和Fe(III)离子共修饰的高效TiO2光催化剂。光催化结果表明，同时改性的Fe(III)/F-TiO2光催化剂比纯TiO2光催化剂和单组分改性的Fe(III)/TiO2和F-TiO2光催化剂具有明显的光催化性能。在现有实验结果的基础上，我们提出了Fe(III)和F离子可能的协同效应来说明Fe(III)/F-TiO2光催化剂的光催化活性增强，即Fe(III)离子作为有效活性中心快速转移TiO2CB中的光生电子，然后还原氧，而F离子作为其他有效活性中心快速转移TiO2Vb中的光生空穴，从而形成自由基氧化有机物。结果表明，Fe(III)/F-TiO2光催化剂的转移速率和光生电子、空穴的界面催化反应同时加快，从而提高了光催化性能。由于Fe、F资源丰富、成本低廉，所制得的光催化剂具有很好的实际应用前景。此外，本工作为合理制备新型高效光催化剂提供了思路。
The combination of cocatalysts for simultaneously promoting rapid transfer of photogenerated electrons and holes is one of the effective strategies to improve photocatalytic activity of semiconductor photocatalysts. In this study, highly efficient TiO2photocatalyst with co-modification of F and Fe(III) ions was prepared by a facile two wet-chemical method including Fe(III) ions impregnation and then F-ion adsorption on the TiO2surface. The photocatalytic results demonstrated that the simultaneously modified Fe(III)/F-TiO2photocatalyst exhibited obvious enhancement of photocatalytic performance compared with the pure TiO2and single-component modified Fe(III)/TiO2and F-TiO2. Based on the present experimental results, we propose a possible synergistic effect of Fe(III) and F ions to illustrate the enhanced photocatalytic activity of Fe(III)/F-TiO2photocatalyst, namely the Fe(III) ions act as effective active sites to rapidly transfer the photogenerated electrons in the CB of TiO2and then reduce oxygen, while F ions work as other effective active sites to rapidly transfer the photogenerated holes in the VB of TiO2and then form free hydroxide radical to oxidize the organic substances. As a result, the transfer rate and the interfacial catalytic reaction of photogenerated electrons and holes were simultaneously accelerated, which resulted in the enhanced photocatalytic performance of Fe(III)/F-TiO2photocatalyst. Due to the low cost and abundant resource of Fe and F, the obtained photocatalyst is promising for practical application. Furthermore, the present work can provide some good ideas for the rational preparation of new and high-efficiency photocatalysts.
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影响因子：
15
作者：
BORGARELLO, E;KIWI, J;GRATZEL, M
通讯作者：
GRATZEL, M
影响因子：
6.7
作者：
Wei Yu;Xinjuan Liu;L. Pan;Jinliang Li;Junying Liu;Jing Zhang;Ping Li;Cheng Chen;Zhuo Sun
通讯作者：
Wei Yu;Xinjuan Liu;L. Pan;Jinliang Li;Junying Liu;Jing Zhang;Ping Li;Cheng Chen;Zhuo Sun
影响因子：
4.9
作者：
Jungwon Kim;Jaesang Lee;W. Choi
通讯作者：
Jungwon Kim;Jaesang Lee;W. Choi
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
影响因子：
22.1
作者：
Yu, Huogen;Xu, Linli;Yu, Jiaguo
通讯作者：
Yu, Jiaguo
N、S共掺杂-TiO2/粉煤灰微珠复合材料及其可见光光催化活性
影响因子：
6.7
作者：
Lv, Jun;Sheng, Tong;Wu, Yucheng
通讯作者：
Wu, Yucheng