Journal
APPLIED CATALYSIS B-ENVIRONMENTAL
Volume 99, Issue 1-2, Pages 163-169Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.apcatb.2010.06.013
Keywords
Advanced oxidation; Wastewater treatment; Phenol; Co catalyst; Sulphate radical
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Several cobalt ion-exchanged zeolite catalysts based on ZSM-5, zeolite-A, and zeolite-X were prepared and tested for heterogeneous oxidation of phenol in the presence of various oxidants such as H2O2, persulphate, and peroxymonosulphate. It is found that Co-ZSM-5 is highly effective in heterogeneous activation of peroxymonosulphate to produce sulphate radicals but exhibits low activity for the activation of H2O2 and persulphate for organic oxidation in water. Co-zeolite-A and Co-zeolite-X show much faster reaction rate in homogeneous activation of peroxymonosulphate due to decomposition of the catalysts and leaching of Co ions into aqueous solution. Co-ZSM-5 also presents stable performance in heterogeneous activation of peroxymonosulphate for phenol degradation. The phenol degradation depends on catalyst loading, phenol concentration, oxidant concentration and temperature. Kinetic studies indicate that phenol degradation follows zero-order kinetics with an activated energy of 69.7 kj/mol. (C) 2010 Elsevier B.V. All rights reserved.
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