Solar photocatalytic gas-phase degradation of n-decane-a comparative study using cellulose acetate monoliths coated with P25 or sol-gel TiO2 films

• Tipo: Artigo em Revista Científica Internacional
• Data: 2015

Autores

Sandra M. Miranda (Autor) FEUP; Filipe V. S. Lopes (Autor) FEUP; Caio Rodrigues-Silva (Autor) FEUP; Susana D. S. Martins (Autor) FEUP; Adrián M. T. Silva (Autor) FEUP; Joaquim L. Faria (Autor) FEUP; Rui A. R. Boaventura (Autor) FEUP; Vítor J. P. Vilar (Autor) FEUP

Revista

Título: Environmental Science and Pollution Research

Vol. 22 Nº 2

Páginas: 820-832

ISSN: 0944-1344

Editora: Springer Nature

Indexação

ISI Web of Knowledge - 6 Citações

ISI Web of Science

Scopus - 11 Citações

Classificação Científica

FOS: Ciências da engenharia e tecnologias > Engenharia do ambiente

CORDIS: Ciências Tecnológicas > Tecnologia > Tecnologia ambiental

Projetos Associados

LA 20 - PROJECTO ESTRATÉGICO - LA 20 - 2013-2014

AIRPHOTOXI - AIRPHOTOXI-DESTOXIFICAÇÃO SOLAR DE AR INTERIOR: BIOAEROSSÓIS E COVs

Outras Informações

ID Authenticus: P-00A-5M9

DOI: 10.1007/s11356-014-2952-2

Abstract (EN): Cellulose acetate monoliths (CAM) were used as the substrate for the deposition of TiO2 films to produce honeycombed photoactive structures to fill a tubular photoreactor equipped with a compound parabolic collector. By using such a setup, an efficient single-pass gas-phase conversion was achieved in the degradation of n-decane, a model volatile organic compound. The CAM three-dimensional, gas-permeable transparent structure with a rugged surface enables a good adhesion of the catalytic coating. It also provides a rigid structure for packing the tubular photoreactor, and maximizing the illuminated catalyst surface. The efficiency of the photocatalytic oxidation (PCO) process on n-decane degradation was evaluated under different operating conditions, such as feeding concentration (73 and 146 ppm), gas stream flow rate (73, 150, and 300 mL min(-1)), relative humidity (3 and 25 %), and UV irradiance (18.9, 29.1, and 38.4 W-UV m(-2)). The results show that n-decane degradation by neat photolysis is negligible, but mineralization efficiencies of 86 and 82 % were achieved with P25-CAM and SG-CAM, respectively, for parent pollutant conversions above 95 %, under steady-state conditions. A mass transfer model, considering the mass balance to the plug-flow packed photoreactor, and PCO reaction given by a Langmuir-Hinshelwood bimolecular non-competitive two types of sites equation, was able to predict well the PCO kinetics under steady-state conditions, considering all the operational parameters tested. Overall, the performance of P25-CAM was superior taking into account mineralization efficiency, cost of preparation, surface roughness, and robustness of the deposited film.

Idioma: Inglês

Tipo (Avaliação Docente): Científica

Nº de páginas: 13