Photocatalytic activities of TiO2 layers immobilized on glass substrates by dip-coating technique toward the decolorization of methyl orange as a model organic pollutant
Photocatalytic activities of TiO2 layers immobilized on glass substrates by dip-coating technique toward the decolorization of methyl orange as a model organic pollutant
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DOI：
10.1016/j.jece.2017.02.025
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发表时间：
2017-04-01
影响因子：
7.7
通讯作者：
Zerdaoui, Mostefa
中科院分区：
文献类型：
--
作者：
Bouarioua, Azeddine;Zerdaoui, Mostefa
本文的目的是评估的光催化活性的固定化催化剂层的二氧化钛脱色的橙子水溶液（MO）作为一种模式的有机污染物在紫外光照射下。采用简单的浸涂法在玻璃基体上制备了三层稳定的TiO2粉体。XRD分析表明，催化剂膜具有微晶结构.薄膜的结晶度随层数的增加而增加。SEM分析显示多孔TiO2薄膜。多层涂层增加了玻璃载体的覆盖表面。经过测试，催化剂膜具有良好的重现性和与载体的良好附着力。考察了操作参数和催化剂层数对MO脱色的影响。动力学研究表明，MO光脱色反应符合准一级反应。在最佳反应器中使用三层催化剂的MO颜色去除效率比使用一层催化剂在正常条件下的MO颜色去除效率高5倍。在最佳反应器中，发现TiO2粉末的固定化层具有完全的MO脱色的光催化活性。固定化系统可以取代悬浮模式并消除昂贵的分离过程。(C)2017爱思唯尔有限公司版权所有
The aim of this article is to evaluate the photocatalytic activities of the immobilized catalyst layers of titanium dioxide for the decolorization of methyl orange aqueous solution (MO) as a model organic contaminant under UV irradiation. Three stable layers of TiO2 powder were coated on glass substrate by facile dip-coating technique. XRD analysis showed anatase crystalline structure of catalyst films. The films crystallinity increased with the layers number. SEM analysis showed porous TiO2 films. The multicoating increased the coverage surface of glass support. The catalyst films showed well reproducibility and good adhesion to the support after tests. The effects of operating parameters and the number of catalyst layers on the MO decolorization were investigated. The kinetic study of the MO photodecolorization showed a pseudo-first-order reaction. The MO color removal by the use of three coated layers of catalyst in the optimum reactor was more effective and 5 times faster than that with the use of one coated layer of catalyst at normal conditions. The immobilized layers of TiO2 powder was found photocatalytic active for complete MO decolorization in the optimum reactor. The immobilized system may replace suspension mode and eliminate the costly separation process. (C) 2017 Elsevier Ltd. All rights reserved.