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Decomposition of 2‐chlorophenol, 4‐chlorophenol and 2,4,6‐trichlorophenol by catalytic oxidation over cobalt and nickel impregnated SBA‐15
Author(s) -
Mayani Suranjana V.,
Mayani Vishal J.,
Kim Sang Wook
Publication year - 2013
Publication title -
the canadian journal of chemical engineering
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.404
H-Index - 67
eISSN - 1939-019X
pISSN - 0008-4034
DOI - 10.1002/cjce.21737
Subject(s) - catalysis , chemistry , chlorophenol , hydrogen peroxide , aqueous solution , leaching (pedology) , cobalt , nickel , nuclear chemistry , inorganic chemistry , decomposition , phenol , organic chemistry , soil water , environmental science , soil science
This work describes the use of Co(II) and Ni(II) impregnated SBA‐15 as catalysts for the oxidative degradation of a few persistent chlorinated phenols in an aqueous medium: 2‐chlorophenol (2‐CP), 4‐chlorophenol (4‐CP) and 2,4,6‐trichlorophenol (2,4,6‐TCP). The catalysts were characterised in terms of their crystallographic features, surface topography, functional groups, thermal stability, etc. The oxidation reactions were carried out using the reaction time, concentration of chlorophenol, amount of catalyst and pH of the reaction mixture as the process variables with or without hydrogen peroxide as the chemical oxidising agent. The conversion achieved with Co/SBA‐15 for 2‐CP, 4‐CP and 2,4,6‐TCP was respectively 84.7%, 78.4% and 64.8% with H 2 O 2 and 86.3%, 80.2% and 70.3% in the absence of H 2 O 2 . The conversion with Ni/SBA‐15 also at 353 K for 2‐CP, 4‐CP and 2,4,6‐TCP was, respectively, 82.3%, 81.9% and 64.0% at 5 h with H 2 O 2 and 89.5%, 82.9% and 65.6% without H 2 O 2 . The reactions followed pseudo‐first‐order kinetics. The leachability study indicated that the catalysts release very little Co and Ni to water. Therefore, the possibility of water contamination through metal leaching was almost negligible. Oxidative degradation was confirmed by measuring the total organic carbon. © 2012 Canadian Society for Chemical Engineering