Synthesis of Ti02 N anosized Powder Photocatalyst Via Solgel Method for Bacteria Inactivation Application

Diana, Farah and Iis, Sopyan and Mel, Maizirwan (2011) Synthesis of Ti02 N anosized Powder Photocatalyst Via Solgel Method for Bacteria Inactivation Application. Malaysian Journal of Microscopy, 7. pp. 161-169. ISSN 1823-7010

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Abstract

Titanium dioxide (Ti02) is the most widely used photocatalyst and has been applied for water and air purification and disinfection of microorganism. Anatase structured Ti02 is a wide bandgap (3.2 eV) semiconductor which, under UV light, is able to degrade chemicals and cell components of microorganisms. In this study, Ti02 nanopowder photocatalyst was synthesized by sol-gel process using a titanium chelate compound, titanium (di-isopropoxide) bis(acetylacetonate) (PTP) as the precursor. The precursor was hydrolyzed under an acidic catalyst condition, followed by reflux for 15 minutes and 1 hour. The precipitate powder obtained after filtration was calcined at 400°C. XRD analysis confirmed that the Ti02 powders A (15 minutes reflux) and B (1 hour reflux) have strongest peak at 25° which indicates anatase crystal structure. The particle size of powder A was smaller than the powder B as proved by calculation using Scherrer's equation. The crystallization temperature of Ti02 powder A was higher due to its smaller particles that needed more heat to crystallize than powder B as confirmed by TGIDTA. FESEM analysis showed powder A have homogenous spherical shape, contrast to powder B showing inhomogenous spherical shape and connected particle. The Ti02 photocatalyst activity in killing bacteria was investigated for 5 hours by varying the concentration 'of Ti02 and UV light intensity.

Item Type:	Article (Journal)
Additional Information:	4809/21752
Uncontrolled Keywords:	Ti02 photocatalyst, sol-gel, nanopowder, bacteria killing
Subjects:	T Technology > TP Chemical technology > TP155 Chemical engineering T Technology > TP Chemical technology > TP248.13 Biotechnology
Kulliyyahs/Centres/Divisions/Institutes (Can select more than one option. Press CONTROL button):	Kulliyyah of Engineering > Department of Manufacturing and Materials Engineering
Depositing User:	Dr Maizirwan Mel
Date Deposited:	31 Mar 2012 07:22
Last Modified:	20 Mar 2013 17:34
URI:	http://irep.iium.edu.my/id/eprint/21752

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