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International Journal of Photoenergy
Volume 2017, Article ID 5373482, 9 pages
Research Article

Effect of the Mg/Al Ratio on Activated Sol-Gel Hydrotalcites for Photocatalytic Degradation of 2,4,6-Trichlorophenol

1Departamento de Química, División de Ciencias Naturales y Exactas de la Universidad de Guanajuato, Noria Alta s/n, Col. Noria Alta, 36050 Guanajuato, GTO, Mexico
2Departamento de Ingeniería Civil, División de Ingenierías de la Universidad de Guanajuato, Juárez No. 77, Col. Centro., 36000 Guanajuato, GTO, Mexico
3Departamento Química, Ecocatal, Universidad Autónoma Metropolitana-Iztapalapa, Av. San Rafael Atlixco No. 186, 09340 Ciudad de México, Mexico
4Grupo Ciencia de Materiales Avanzados, Facultad de Ciencias, Universidad Nacional de Colombia-Sede Medellín, 59A No. 63-20, Medellín, Colombia

Correspondence should be addressed to Esthela Ramos-Ramírez; xm.otgu@ersomar and Norma L. Gutiérrez-Ortega; xm.otgu@tugamron

Received 4 February 2017; Revised 17 May 2017; Accepted 21 June 2017; Published 19 September 2017

Academic Editor: Juan M. Coronado

Copyright © 2017 Esthela Ramos-Ramírez et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


Currently, interest has grown in finding effective solutions for the treatment of water pollution by toxic compounds. Some of the latter that have acquired importance are phenols and chlorophenols, due to their employment in the manufacture of pesticides, insecticides, cords of wood, paper industry, among others. The problem is rooted in that these compounds are very persistent in the environment because they are partially biodegradable and cannot be photodegraded directly by sunlight. Chlorophenols are extremely toxic, especially 2,4,6-trichlorophenol, which is potentially carcinogenic. In this work, Mg/Al-mixed oxide catalysts were obtained from the thermal treatment of hydrotalcite-type materials, synthesized by sol-gel method with different Mg/Al ratios. Hydrotalcites and Mg/Al-mixed oxides were physicochemically characterized by X-ray diffraction, thermal analysis (DTA and TGA), and N2 physisorption. The results were obtained on having proven the photocatalytic degradation of 2,4,6-trichlorophenol as a pollutant model by water. The catalysts obtained present the hydrotalcite phase with thermal evolution until achieving Mg/Al-mixed oxides at 500°C. The catalysts are of mesoporous materials and exhibiting large surface areas. The catalysts demonstrated good photocatalytic activity with good efficiency, reaching degradation percentages with Mg/Al = 1, 2, 4, 5, and 7 ratios of 94.2, 92.5, 86.2, 84.2, and 63.9%, respectively, until achieving mineralization.