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Photocatalytic Degradation of p-Cresol by Zinc Oxide under UV Irradiation
Advanced Materials and Nanotechnology Laboratory, Institute of Advanced Technology, Universiti Putra Malaysia, 43400 Serdang, Selangor D.E., Malaysia
Department of Chemistry, Faculty of Science, Universiti Putra Malaysia, 43400 UPM Serdang, Selangor, Malaysia
* Authors to whom correspondence should be addressed.
Received: 5 September 2011; Accepted: 11 October 2011 / Published: 27 December 2011
Abstract: Photocatalytic degradation of p-cresol was carried out using ZnO under UV irradiation. The amount of photocatalyst, concentration of p-cresol and pH were studied as variables. The residual concentration and mineralization of p-cresol was monitored using a UV-visible spectrophotometer and total organic carbon (TOC) analyzer, respectively. The intermediates were detected by ultra high pressure liquid chromatography (UPLC). The highest photodegradation of p-cresol was observed at 2.5 g/L of ZnO and 100 ppm of p-cresol. P-cresol photocatalytic degradation was favorable in the pH range of 6–9. The detected intermediates were 4-hydroxy-benzaldehyde and 4-methyl-1,2-benzodiol. TOC studies show that 93% of total organic carbon was removed from solution during irradiation time. Reusability shows no significant reduction in photocatalytic performance in photodegrading p-cresol.
Keywords: photocatalytic degradation; p-cresol; mineralization; ZnO; UV
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Abdollahi, Y.; Abdullah, A.H.; Zainal, Z.; Yusof, N.A. Photocatalytic Degradation of p-Cresol by Zinc Oxide under UV Irradiation. Int. J. Mol. Sci. 2012, 13, 302-315.
Abdollahi Y, Abdullah AH, Zainal Z, Yusof NA. Photocatalytic Degradation of p-Cresol by Zinc Oxide under UV Irradiation. International Journal of Molecular Sciences. 2012; 13(1):302-315.
Abdollahi, Yadollah; Abdullah, Abdul Halim; Zainal, Zulkarnain; Yusof, Nor Azah. 2012. "Photocatalytic Degradation of p-Cresol by Zinc Oxide under UV Irradiation." Int. J. Mol. Sci. 13, no. 1: 302-315.