Catálisis, cinética y reactores

 

Evaluación de compositos TiO₂/clinoptilolita en la fotodegradación del tinte MV–2B en un reactor–concentrador solar CPC

 

Evaluation of TiO₂/clinoptilolite composites in MV–2B dye photodegradation on CPC solar reactor

 

M.E. Trujillo–Camacho¹, C. García–Gómez¹, J.F. Hinojosa–Palafox¹ y F.F. Castillón–Barraza²*

 

¹ Depto. de Ing. Química y Metalurgia, Universidad de Sonora. Blvd. Luis Encinas y Rosales s/n, Col. Centro, Hermosillo, Sonora, 83000, México.

² Depto. de Nanocatálisis, Centro de Nanociencia y Nanotecnología, UNAM. Km. 107 Carretera Tijuana–Ensenada, CP. 22800, Ensenada, B.C, México. * Autor para la correspondencia. E–mail: mariat@iq.uson.mx

 

Recibido 23 de Noviembre 2009.
Aceptado 3 de Mayo 2010.

 

Resumen

En este trabajo se reporta el desempeño de materiales de TiO₂ y TiO₂/clinoptilolita (en proporciones en peso de 1/99, 10/90, 99/1 y 90/10) sintetizados por la técnica de sol gel, en los procesos de adsorción y degradación fotocatalítica del tinte metil violeta 2B (MV–2B). Los materiales íueron depositados sobre sustratos de vidrio y colocados en reactores tubulares acoplados a concentradores solares tipo CPC con dos diíerentes razones de concentración geométrica. Los fotocatalizadores en polvo íueron caracterizados por difracción de rayos X, microscopía electrónica de transmisión (TEM) y método BET para la determinación del área superficial; los depósitos de los materiales se caracterizaron por perfilometría y microscopía electrónica de barrido (SEM). Los resultados mostraron que la incorporación de clinoptilolita mejora la calidad del depósito en los sustratos de vidrio al proporcionar mayor adherencia incrementando por arriba del 10%, la cantidad de tinte eliminado de la solución.

Palabras clave: concentradores CPC, fotocatálisis, TiO₂/clinoptilolita, metil violeta 2B, radiación solar.

 

Abstract

In this work is reported the performance of TiO₂ and TiO₂/clinoptilolite composites (with weight proportions of 1/99, 10/90, 99/1 and 90/10) synthesized by the sol–gel technique, in the adsorption and photocatalytic degradation of MV 2B dye (MV–2B). The materials were supported on glass substrates and mounted on tubular reactors coupled to CPC solar concentrator with two different geometric concentration ratios. The photocatalyzer powders were characterized by X–ray diffraction, transmission electron microscopy (TEM) and the BET method for surface area determination; the material deposits were characterized by profilometry and scanning electronic microscopy (SEM). The results showed that the incorporation of clinoptololite improved the quality of the materials deposit on glass substrates by bringing a better adherence and also increased the efficiency of the degradation process by up 10%.

Keywords: CPC concentrators, photocathalysis, TiO₂/clinoptilolite, methyl violet 2B, solar radiation.

 

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