Photodegradation of Reactive Black 5 by Titanium Oxide Film Obtained with Ultrasonic Pyrolysis Technique
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Photodegradation of Reactive Black 5 by Titanium Oxide Film Obtained with Ultrasonic Pyrolysis Technique R. T. Hernández L., I. Hernández-Pérez, D. Y. Medina V.*, N. Becerril and S. Soyuqui Division of Basic Science and Engineering, Metropolitan Autonomous University, San Pablo 180, Azcapotzalco, México D.F., 02200, México. Email: [email protected] ABSTRACT The present work reports the photodegradation results of the Reactive Black 5 (RB5) izo dye by using titanium oxide films as photocatalysts. The films were obtained by ultrasonic spray pyrolysis deposit technique from a 0.0076 M of Ti(IV)-acetyl-acetonate and N,Ndimethylformamide solution over corning glasses as substrates. The film obtained by deposition at 450 °C for 6.0 min shows the best photocatalysis behavior, which may degrade 50% of 100 ppm RB5 in a period of 120 min, as monitored with a spectra-photometer UV-Vis between 190 to 900 nm. After 180 minutes of degradation, a 70% conversion could be obtained. These results are better than that obtained with TiO2 powders as photocatalyst. INTRODUCTION At the present time the emission of pollutants from textile industry represents one of the most serious problems, since this industry discharges enormous amounts of water containing a variety of dyes that are resistant to the conventional wastewater treatment processes. Different emerging technologies have been tried to solve this problem [1, 2]. Among them, an advanced oxidation process has demonstrated to be the most viable alternative. In particular, TiO2 has gained considerable importance as a photocatalyst [3, 4], because it has efficient photoactivity, high stability and low cost in the wastewater treatment. Many fabrication techniques had been used to produce various forms of titania like pellets, powders and films [5]. In comparison with conventional methods, film preparation by using an ultrasonic spray pyrolysis method provides advantages such as low equipment cost, good thickness uniformity over large area, low temperature and low or without vacuum requirement in processing, and so forth [6]. In the present work, we have studied the degradation of RB5 azo dye discharged from a textile factory by employing titanium oxide films which were obtained by the ultrasonic spray pyrolysis deposit technique. EXPERIMENTAL DETAILS Titanium oxide films preparation. The TiO2 photocatalyst like films were deposited by the ultrasonic spray pyrolysis technique over corning glasses. A 0.0076 M spray solution, obtained from Ti(IV) acetilacetonate (AlfaAesar) dissolved in N,N-dimethylformamide (Sigma-Aldricht), was used. The films were deposited at a temperature ranged from 400 to 600 °C for a period of 1 to 6 min. Filtered air was used as carrier gas. The solution flow rate was a 70ml/min and the ultrasonic vibration was 0.9Hz. These films were characterized by Scan Electronic Microscopy (SEM), X-Ray Diffraction (XRD), Energy Dispersive Spectroscopy (EDS) and Atomic Force Microscopy (AFM).
Photocatalytic test. The photocatalytic tests were carried out in a batc
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