Mechanism of enhanced photocatalysis of TiO2 by Fe3+ in suspensions
Mechanism of enhanced photocatalysis of TiO2 by Fe3+ in suspensions
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DOI：
10.1016/j.apsusc.2011.08.097
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发表时间：
2011-12-01
影响因子：
6.7
通讯作者：
Deng, Lin
中科院分区：
文献类型：
--
作者：
Zhang, Junwei;Fu, Dafang;Deng, Lin
本文以磺胺嘧啶（SD）为模型化合物，研究了Fe3+增强TiO2光催化的机理。结果表明，TiO2悬浮液中加入Fe3+可提高SD的降解率。在悬浮液中，TiO2颗粒的晶体结构稳定。TiO2/Fe3+ （TiO2和Fe3+）光催化生成的羟基自由基产率较高。此外，我们发现Fe2+对TiO2悬浮液中SD的降解没有明显的影响，而Fe3+有显著的影响。在悬浮液中加入Fe3+后，TiO2的吸附量大大增加。最后，通过研究TiO2颗粒的表面行为，提出了含Fe3+的TiO2悬浮液中SD降解的相互作用模型。利用Fe3+作为TiO2粒子表面的电子受体，有利于提高羟基自由基的产率。(C) 2011 Elsevier B.V.版权所有
In this work, the mechanism of enhanced photocatalysis of TiO2 with Fe3+ was studied using Sulfadiazine (SD) as the model compound. Results indicated that degradation rate of SD was enhanced by the addition of Fe3+ in TiO2 suspension. The crystalline structure of TiO2 particles was stable in suspensions. The hydroxyl radical generated by TiO2/Fe3+ (both TiO2 and Fe3+) photocatalysis was in a higher yield. Moreover, Fe2+ was found not to give an obvious impact on the SD degradation in TiO2 suspension, whereas Fe3+ had a notable effect. The adsorption amount of TiO2 was greatly enhanced by the addition of Fe3+ in suspensions. Finally, an interaction model of SD degradation in TiO2 suspension containing Fe3+ was also proposed by investigating of surface behaviors of TiO2 particles. It will be beneficial to use Fe3+ as the electron acceptors on the surface of TiO2 particles, which helps to improve the yield of hydroxyl radical. (C) 2011 Elsevier B.V. All rights reserved.