Kinetic studies on UV-photodegradation of some chlorophenols using TiO2 catalyst.
J Environ Sci Health A Tox Hazard Subst Environ Eng, 2002/3;37(3):365-83.
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PMID: 11929075
Impact factor: 2.582
Abstract
A number of chlorophenols, namely 2-chlorophenol, 2,4,-dichlorophenol and 2,4,6-trichlorophenol, were decomposed in aqueous solution by using TiO2 as photoactivated catalyst under UV radiation emitted by a 125W medium pressure Hg lamp in an immersion well-type quartz photoreactor. The organic-bound chlorine was converted into the environmentally harmless inorganic chloride. For catalyst doses between 0.1 and 0.5gl(-1) the reaction mechanisms are elucidated. The corresponding rate constants were obtained by periodically measuring the remaining chlorophenol, and converted chloride in solution. A theoretical model for the degradation pathway is proposed expressing the rate as a linear function of the concentrations of chlorophenol and catalyst. Aside from the model-calculated values, the pseudo-first order rate constants for a rough approximation of chlorophenols degradation as well as the kinetic parameters of Langmuir-Hinshelwood type decomposition are compared. The photodegradation rate of chlorophenols followed the order: C13 x Ph > Cl2 x Ph > Cl x Ph.
MeSH terms
Chlorophenols; Coloring Agents; Environmental Pollutants; Kinetics; Mutagens; Photochemistry; Titanium
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