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Enhanced photodegradation of o-cresol in aqueous Mn(1%)-doped ZnO suspensions

Abdollahi, Yadollah and Abdullah, Abdul Halim and Zainal, Zulkarnain and Yusof, Nor Azah (2011) Enhanced photodegradation of o-cresol in aqueous Mn(1%)-doped ZnO suspensions. Environmental Technology . pp. 1-7. ISSN 1479-487X

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Official URL: http://dx.doi.org/10.1080/09593330.2011.618931

Abstract

The effective removal of o-cresol is currently both an environmental and economic challenge. ZnO is not only an efficient photocatalyst but is also cost effective, as its photoabsorption can extend from the ultraviolet (UV) to the visible range thereby allowing the use of inexpensive visible light sources, such as sunlight. The principal objective of the present work is to investigate the visible light-driven removal of o-cresol from aqueous solution in the presence of 1.0 wt% Mn-doped ZnO. To measure the efficiency of photodegradation, the variables studied included the amount of photocatalyst, concentration of o-cresol, pH and irradiation time. The concentration of o-cresol and residual organic carbon was monitored using a UV-visible spectrophotometer, ultra high-pressure liquid chromatography and a total organic carbon analyser. The optimum conditions under which the photodegradation of o-cresol was most favourable corresponded to 1.5 g/l ZnO, 35 ppm o-cresol and pH 9. The ZnO-1wt%Mn photoprocess has demonstrated reusability for more than three times, which warrants its scale-up from laboratory- to in industrial-scale application.

Item Type:Article
Keyword:Photodegradation; Doped ZnO; Mineralization; Visible
Faculty or Institute:Institute of Advanced Technology
Publisher:Taylor & Francis
DOI Number:10.1080/09593330.2011.618931
ID Code:18777
Deposited By: Norhaliza Zainal
Deposited On:19 Mar 2012 11:13
Last Modified:04 Feb 2016 12:06

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