Nanosized TiO2 photocatalyst powder via sol-gel method: effect of hydrolysis degree on powder properties

-, Nor Hafizah and Sopyan, Iis (2009) Nanosized TiO2 photocatalyst powder via sol-gel method: effect of hydrolysis degree on powder properties. International Journal of Photoenergy, 2009. pp. 1-8. ISSN 1687-529X

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Abstract

Nanosized TiO2 powder was synthesized via sol-gel method using titanium tetraisopoxide (TPT) as the precursor. Mol ratios of water to TPT were varied from 1 (Powder A), 2 (Powder B), 3 (Powder C), and 4 (Powder D) to evaluate effect of hydrolysis degree. TG/DTA curves showed that amorphous phase turned to anatase crystal structure at ca. 415, 337, 310, and 339∘C for Powders A, B, C, and D, respectively. XRD analysis showed that all the synthesized TiO2 powders were 100% in anatase form with Powders B and C showing considerably higher crystallinities. The powders obtained at lower water to TPT mol ratios were spherical in shape and they became bar-like shapes higher mol ratios. The lower hydrolysis degree led to higher surface area of the Powder A (24.8 m2/g) compared to Powder B (14.6 m2/g). From phenol photocatalytic measurement, Powder B was the most efficient attributed to its higher crystallinity.

Item Type:	Article (Journal)
Additional Information:	4809/11417
Subjects:	T Technology > TS Manufactures
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:	03 Feb 2012 10:30
Last Modified:	22 Mar 2012 11:45
URI:	http://irep.iium.edu.my/id/eprint/11417

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