Journal
CHEMICAL ENGINEERING JOURNAL
Volume 228, Issue -, Pages 646-654Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.cej.2013.05.057
Keywords
Fenton; CWPO; Magnetic catalyst; Chlorophenol
Categories
Funding
- Spanish MICINN [CTQ2008-03988, CTQ2010-14807]
- CM [S-2009/AMB-1588]
- Spanish Ministry of Education
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Different advanced oxidation strategies have been investigated for the treatment of chlorophenols in aqueous phase with the aim of improving the removal efficiency in terms of mineralization, remanent by-products and kinetics. Those strategies were homogeneous Fenton-like oxidation and CWPO with two different own-prepared FexOy/gamma-Al2O3 catalysts. The intensification of the process by increasing the temperature has been also evaluated. CWPO of chlorophenols with those catalysts has proved to be more efficient than homogeneous Fenton-like oxidation due to a lower rate of H2O2 decomposition allowing a higher availability of hydroxyl radicals along the course of reaction. Increasing the temperature clearly improved the oxidation rate and mineralization degree of both homogeneous Fenton-like oxidation and CWPO, achieving almost 90% TOC reduction after 1 h at stoichiometric H2O2 dose, 100 mg L-1 initial chlorophenol concentration, 1 g L-1 Fe3O4/gamma-Al2O3 catalyst, pH 3 and 90 degrees C temperature. Both FexOy/gamma-Al2O3 catalysts suffered fairly low iron leaching (<5%) and a remarkable stability in a three-cycles test with 2,4,6-TCP. The use of the magnetic catalyst is preferable due to its easy separation and recovery from the liquid phase by a magnet. Its magnetic properties remained unchanged after use in CWPO. (C) 2013 Elsevier B.V. All rights reserved.
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