Development of visible light sensitive titania photocatalysts by combined nitrogen and silver doping

El Saliby, Ibrahim and Erdei, Laszlo and Shon, Ho Kyong and Kim, Jong-Ho (2011) Development of visible light sensitive titania photocatalysts by combined nitrogen and silver doping. Journal of Industrial and Engineering Chemistry, 17 (2). pp. 358-363. ISSN 1226-086X

Abstract

In this study we present the effects of non-metal (nitrogen) and metal/non-metal (silver/nitrogen) dopants on titanium dioxide (TiO2) in synthesising visible-light reactive photocatalysts. Nanopowders of TiO2-N and TiO2-N–Ag were synthesised using a simple procedure at room temperature. For nitrogen doping, a dispersion of Degussa P-25 was treated with ammonium hydroxide. The obtained modified catalyst was further treated with silver nitrate powder to facilitate silver-nitrogen co-doping. The produced catalysts were characterised using X-ray diffraction, X-ray photoelectron spectroscopy, and specific surface area measurements. Scanning electron microscopy/energy dispersive X-ray and transmission electron microscopy were adapted to detect changes in the morphology and in the chemical composition of synthesised catalysts. The results show that both the morphology and appearance of catalysts were modified to yield nanopowders of yellowish color and relatively high specific surface area. Methylene blue (MB) dye was used as a model aquatic contaminant in 23 mg/L concentration to study the performance of these novel photocatalysts in an aerobic mixed batch reactor system under white light irradiation. Both nitrogen and nitrogen-silver co-doping lead to visible light sensitivity and the new catalysts showed remarkable activities in the decolorisation of MB.


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Item Type: Article (Commonwealth Reporting Category C)
Refereed: Yes
Item Status: Live Archive
Additional Information: Permanent restricted access to published version due to publisher copyright restrictions.
Depositing User: Dr Laszlo Erdei
Faculty / Department / School: Historic - Faculty of Engineering and Surveying - Department of Agricultural, Civil and Environmental Engineering
Date Deposited: 29 Jan 2012 07:41
Last Modified: 26 Aug 2014 22:22
Uncontrolled Keywords: titanium dioxide; silver-doped; nitrogen-doped; photocatalyst
Fields of Research (FOR2008): 09 Engineering > 0904 Chemical Engineering > 090409 Wastewater Treatment Processes
10 Technology > 1007 Nanotechnology > 100701 Environmental Nanotechnology
09 Engineering > 0912 Materials Engineering > 091205 Functional Materials
Socio-Economic Objective (SEO2008): E Expanding Knowledge > 97 Expanding Knowledge > 970109 Expanding Knowledge in Engineering
Identification Number or DOI: doi: 10.1016/j.jiec.2011.02.039
URI: http://eprints.usq.edu.au/id/eprint/20644

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