Preparation and characterisation of mesoporous photoactive Na-titanate microspheres

El Saliby, Ibrahim and Erdei, Laszlo and Shon, Ho Kyong and Kim, Jong Beom and Kim, Jong-Ho (2011) Preparation and characterisation of mesoporous photoactive Na-titanate microspheres. Catalysis Today, 164 (1). pp. 370-376. ISSN 0920-5861

Abstract

Mesoporous Na-titanate microspheres were fabricated by a simple low temperature hydrothermal synthesis. Microspheres were obtained after treating TiO2 (Degussa P-25) with a mixture of sodium hydroxide (NaOH) and hydrogen peroxide (H2O2) at 25 ◦C and 80 ◦C. The as-prepared powders were characterised by X-ray diffraction, N2 adsorption–desorption measurements and scanning electron microscope/energy dispersive X-ray spectroscopy. The as-prepared microspheres were calcined at 550 ◦C to investigate the effect of calcination on morphology and characteristics. Microspheres were tested for the adsorption and photodecomposition of methylene blue (MB) under ultraviolet light. The results revealed that microspheres with average diameter of 700 nm were formed by self-assembly of tiny TiO2 nanoparticles during the reaction at 25 ◦C, whereas spherical aggregation of nanofibres was detected in powders produced at 80 ◦C. Calcination of samples had low impact on morphology, adsorption and photocatalytic degradation of MB. These novel materials are effective adsorbents of MB, and also capable of its photodecolorisation.


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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 policy.
Depositing User: Dr Laszlo Erdei
Faculty / Department / School: Historic - Faculty of Engineering and Surveying - Department of Agricultural, Civil and Environmental Engineering
Date Deposited: 25 Feb 2012 02:40
Last Modified: 26 Aug 2014 22:21
Uncontrolled Keywords: Na-titanate; methylene blue; microspheres; mesoporous titanium dioxide
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 > 970102 Expanding Knowledge in the Physical Sciences
Identification Number or DOI: doi: 10.1016/j.cattod.2010.11.026
URI: http://eprints.usq.edu.au/id/eprint/20643

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