A facile method to prepare translucent anatase thin films in monolithic structures for gas stream purification

Author(s)

Rodrigues-Silva, Caio ; Monteiro, Ricardo A. R. ; Dezotti, Marcia ; Silva, Adrian M. T. ; Pinto, Eugenia ; Boaventura, Rui A. R. ; Vilar, Vitor J. P.

• Document type: Journal article
• Source: Environmental Science and Pollution Research; v. 25, n. 28, p. 12-pg., 2018-10-01.

Abstract

In the present work, a facile method to prepare translucent anatase thin films on cellulose acetate monolithic (CAM) structures was developed. A simple sol-gel method was applied to synthesize photoactive TiO2 anatase nanoparticles using tetra-n-butyl titanium as precursor. The immobilization of the photocatalyst on CAM structures was performed by a simple dip-coating method. The translucent anatase thin films allow the UV light penetration through the CAM internal walls. The photocatalytic activity was tested on the degradation of n-decane (model volatile organic compoundVOC) in gas phase, using a tubular lab-scale (irradiated by simulated solar light) and pilot-scale (irradiated by natural solar light or UVA light) reactors packed with TiO2-CAM structures, both equipped with compound parabolic collectors (CPCs). The efficiency of the photocatalytic oxidation (PCO) process in the degradation of n-decane molecules was studied at different operating conditions at lab-scale, such as catalytic bed size (40-160cm), TiO2 film thickness (0.435-0.869m), feed flow rate (75-300cm(3)min(-1)), n-decane feed concentration (44-194ppm), humidity (3 and 40%), oxygen concentration (0 and 21%), and incident UV irradiance (18.9, 29.1, and 38.4W(UV)m(-2)). The decontamination of a bioaerosol stream was also evaluated by the PCO process, using Pseudomonas aeruginosa (Gram-negative) and Staphylococcus aureus (Gram-positive) as model bacteria. A pilot-scale unit was operated day and night, using natural sunlight and artificial UV light, to show its performance in the mineralization of n-decane air streams under real outdoor conditions. (AU)

• FAPESP's process: 14/16622-3 - Identification of intermediates formed during degradation of veterinary drugs by advanced oxidation processes
• Grantee: Caio Alexandre Augusto Rodrigues da Silva
• Support Opportunities: Scholarships in Brazil - Post-Doctoral