Photocatalytic decolourization of basic green dye by pure and Fe, Co doped TiO2 under daylight illumination
Photocatalytic decolourization of basic green dye by pure and Fe, Co doped TiO2 under daylight illumination
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DOI：
10.1016/j.desal.2010.11.007
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发表时间：
2011-03-15
期刊：
影响因子：
9.9
通讯作者：
Saravanan, Pichiah
中科院分区：
文献类型：
--
作者：
Narayana, R. Lakshmi;Matheswaran, Manickam;Saravanan, Pichiah
采用溶胶-凝胶法制备了纯TiO 2光催化剂、Fe和Co掺杂的TiO 2光催化剂。以碱性染料孔雀石绿色为目标染料，在太阳光照射下考察了所制备的光催化剂的光催化活性。采用X射线衍射、扫描电镜和紫外-可见光谱对所制备的光催化剂进行了表征。脱色实验结果表明，Fe掺杂的TiO 2光催化活性最高，在3 h内达到98%。用改进的Langmuir-Hinshelwood模型对染料脱色动力学进行了合理化。观察到染料脱色的总速率常数（k）为0.8 h（-1）（Fe掺杂）、0.67 h（-1）（Co掺杂）和031 h（-1）（纯TiO 2）。皇冠版权所有（C）2010由爱思唯尔B. V.出版保留所有权利。
In the present study, a pure TiO2 photocatalyst, Fe and Co doped photocatalyst was prepared via sol-gel method. The prepared photocatalysts were tested for its photocatalytic activity by decolorizing a basic dye namely malachite green dye under sunlight. The prepared photocatalysts were characterized with X-ray diffraction, scanning electron microscope and UV-Visible spectroscopy. From the decolourizing study, it was observed that Fe-doped TiO2 shown highest photocatalytic activity among the other two with 98% in 3 h. The Kinetics of dye decolourization was rationalized by a modified Langmuir-Hinshelwood model. The overall rate constants (k) for dye decolourization was observed in the order of 0.8 h(-1) for Fe-doped 0.67 h(-1) for Co-doped and 031 h(-1) for pure TiO2. Crown Copyright (C) 2010 Published by Elsevier B.V. All rights reserved.