Effect of calcination time of a quadruple-element doped titania nanoparticles in the photodegradation of gaseous formaldehyde under blue light irradiation

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Title:	Effect of calcination time of a quadruple-element doped titania nanoparticles in the photodegradation of gaseous formaldehyde under blue light irradiation
Authors:	Laciste, Maricris T. de Luna, Mark Daniel G. Tolosa, Nolan C. Lu, Ming-Chun
Contributors:	Univ Philippines, Natl Grad Sch Engn, Environm Engn Program Dept Environm & Nat Resources, Environm Qual Management Div, Environm Management Bur Univ Philippines, Dept Chem Engn Univ San Agustin, Coll Technol, Dept Chem Engn Chia Nan Univ Pharm & Sci, Dept Environm Resources Management
Keywords:	Calcination duration Gaseous formaldehyde Indoor air purification Visible-light photocatalysis VOC emissions
Date:	2020
Issue Date:	2022-11-18 11:25:31 (UTC+8)
Publisher:	Pergamon-Elsevier Science Ltd
Abstract:	The photocatalytic degradation of gaseous formaldehyde using Ag/F/N/W-doped titanium dioxide was examined. The photocatalytic reaction was conducted using photocatalysts immobilized on glass tubular reactors illuminated under blue LED lights. Factors affecting gaseous formaldehyde degradation such as photocatalyst's calcination time and dosage, initial formaldehyde concentration, light intensity and operating temperature were studied. Results show that the photocatalytic degradation rate increases with pollutant concentration indicating no mass transfer limitations within the formaldehyde concentration range used. The photodegradation of the formaldehyde using catalyst calcined for 5 h reached similar to 88%. The photocatalyst concentration giving the highest degradation rate is found to be 0.10 gL(-1). Which means that upon increasing the concentration of the immobilized photocatalysts will increase its thickness and it may not increase the number of the photo-induced particles. On the other hand, increasing light intensity and operating temperature increased the photocatalytic degradation of gaseous formaldehyde. The maximum light intensity and operating temperature were measured at 25 Wm(-2) and 40 degrees C, respectively. Langmuir-Hinshelwood kinetic type model was used to describe the photocatalytic reaction. The photocatalytic degradation behavior of gaseous formaldehyde on the modified photocatalyst follows a pseudo-first order rate equation based on a Langmuir-Hinshelwood kinetic type model. (c) 2019 Elsevier Ltd. All rights reserved.
Relation:	Chemosphere, v.246, pp.11
Appears in Collections:	[Dept. of Environmental Resources Management] Periodical Articles

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