Photocatalytic degradation of methylene blue from wastewater using TiO2 as catalyst
Main Article Content
Abstract
In this work, we report the degradation of methylene blue (M.B.) in the presence of TiO2 degussa P25 (TiO2-d), TiO2 prepared by sol gel method (TiO2-sg), TiO2-d and TiO2-sg sulphated (TiO2-d-SO4 and TiO2-sg-SO4) catalysts using UV light and O2 or air as oxidant. DRX analysis of TiO2-d and TiO2-sg materials showed a mixture of anatase and rutile phases, while that, anatasa was the unique phase present in TiO2-sg-SO4. The concentration of catalysts was varied from 0.7 g/l to 1.3 g l-1. The photolysis effect over the M.B degradation was negligible. The degradation of M.B. reached 100% in 6 h of the reaction with TiO2-d and TiO2–sg-SO4 catalysts. The optimal catalysts concentration was 0.9 g l-1.
Article Details
This work is licensed under a Creative Commons Attribution-NonCommercial 4.0 International License.
References
Colon, G., Hidalgo, M. C., Navío, J. A. 2003. Photocatalytic behaviour of sulphated TiO2 for phenol degradation. Applied Catalysis B., 45, 39-50.
Garcés Giraldo, L. F, Peñuela Mesa, G. A. 2005. Cinética de degradación y mineralización del colorante naranja reactivo 84 en aguas. Revista Lasillista de investigación, 2, 21-25.
Grzechulska, J., Waldermar Morawski, A. 2002. Photocatalytic decomposition of azo-dye acid black 1 in water over modified titanium dioxide. Applied Catalysis B. 26, 45-51.
Herrmann, J.M. 1999. Heterogeneous photocatalysis: fundamentals and applications to the removal of various types of aqueous pollutants. Catalysis Today, 53, 115-129.
Hyun Yoon K., Ki., Sok Noh, J., Han Kwon, C.; Muhammed, M. 2006. Photocatalytic behaviour of TiO2 thin film prepared by sol-gel process. Materials Chemistry and Physics 95, 79-83.
Lachheb, H., Puzenat, E., Houas, A., Ksibi, M., Elaloui, E., Guillard, C., Herrmann J. 2002. Photocatalytic degradation of various types of dyes (Alizarin S, Crocein Orange G, Methyl Red, Congo Red, Methylene Blue) in water by UV-irradiated titania. Applied Catalysis B., 1025, 1-16.
Sánchez Cárdenas, M. 2003. Tesis de Maestría, ITA, Aguascalientes, Aguascalientes.
Sung-Yeon K., Lim, T., Chang, T., Chae-Ho Shin, C. 2007. Photocatalysis of methylene blue on titanium dioxide nanoparticles synthesized by modified sol-hydrothermal process of TiCl4. Catalysis Letters, 117, 3–4.