Photocatalytic decomposition of acetaldehyde gas on TiO2-SiO2 thin film photocatalyst ― a kinetic analysis

Abdul Aziz , Radhiyah and Sopyan, Iis (2013) Photocatalytic decomposition of acetaldehyde gas on TiO2-SiO2 thin film photocatalyst ― a kinetic analysis. Indian Journal of Chemical Technology, 20 (2). pp. 137-144. ISSN 0975-0991 E-ISSN 0971-457X

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Abstract

TiO2-SiO2 thin film photocatalysts with 5 (TF95/5) and 10 w/w% (TF90/10) SiO2 contents have been prepared via sol-gel method. Characterization using X-ray diffractormeter and field emission scanning electron microscopy is performed to investigate the effect of SiO2 doping on the TiO2 thin film’s physico-chemical properties. The photocatalytic performance of the thin films is evaluated using the degradation of acetaldehyde gas at various initial concentrations under fixed intensity UV irradiation. A Langmuir-Hinshelwood kinetic model is used to analyze the kinetics of the photocatalytic reaction. It is found that the first order reaction rate constant (k) of the TF95/5 thin film photocatalyst (1.2438 µmol dm-3 min-1) is higher than that of TF90/10 thin film (0.3648 µmol dm-3 min-1). This is attributed to higher crystallinity of the TF95/5 thin film, resulting in more active charge carrier generation. However, TF90/10 thin film photocatalyst with smaller TiO2 particles shows four times stronger adsorbability of acetaldehyde than TF95/5 due to its higher surface area.

Item Type:	Article (Journal)
Additional Information:	4809/29952
Uncontrolled Keywords:	Acetaldehyde gas; kinetic study; sol-gel; thin film
Subjects:	T Technology > TP Chemical technology > TP1080 Polymers, plastics and their manufacture T Technology > TP Chemical technology > TP155 Chemical engineering
Kulliyyahs/Centres/Divisions/Institutes (Can select more than one option. Press CONTROL button):	Kulliyyah of Engineering > Department of Manufacturing and Materials Engineering
Depositing User:	PROF. DR. IIS SOPYAN
Date Deposited:	15 May 2013 09:05
Last Modified:	08 Dec 2016 09:40
URI:	http://irep.iium.edu.my/id/eprint/29952

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