ORIGINAL RESEARCH
Removal of o-Cresol from Water by Adsorption/ Photocatalysis
Wojciech Zmudziński
 
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Department of Commodity Science, Poznań University of Economics,
Al. Niepodległości 10, 61-875 Poznań, Poland
 
Pol. J. Environ. Stud. 2010;19(6):1353–1359
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ABSTRACT
This paper presents the results of research on o-cresol adsorption on both Cactive and TiO2/Cactive, and its photocatalytic oxidation on TiO2/Cactive. It was found that o-cresol adsorption on Cactive was slow: equilibrium adsorption was reached after more than 20 hours. Adsorption isotherm fulfilled Langmuir equation: q=1.153 mmole·g-1, K=1,324 dm3⋅mole-1. The adsorption was reversible. TiO2/Cactive as adsorbent behaved similarly to Cactive itself, although the amount of o-cresol adsorbed per 1 g of TiO2/Cactive was about 10% smaller. It was concluded, based on the results of two-step experiments, that adsorption and photocatalysis (both the o-cresol dissolved in water and that partly desorbed from the surface of active carbon) was photooxidized when illumination of TiO2/Cactive followed 26-hour adsorption of the substrate on the photocatalyst-on-adsorbent. The loss of o-cresol dissolved in water fulfilled the 1st order reaction kinetics. It was found in separate experiments that in the presence of illuminated titania, o-cresol molecules underwent hydroxylation preferentially in para position vs. original OH group. Hydroxylation of ortho position vs. original OH and of the CH3 group was much slower.
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