Abstract
A new Xe-excimer light source has been used for the oxidative degradation of 4-chlorophenol (4-CP) in aqueous solution. Owing to the very high absorption cross-section of water at the wavelength of excitation (172 nm), degradation of the organic substrate is initiated by hydroxyl radicals generated by water photolysis. Neither oxygen concentration, nor the presence of carbonates or nitrates affects the rate of 4-CP degradation; however, maximum oxygen concentration is required for higher rates of mineralization of organic carbon. Kinetic investigations are based on 4-CP, TOC and Cl − analysis. VUV photolysis as a means of oxidative degradation of organic pollutants in aqueous systems is showing the potential to compete with other photochemical oxidative processes.
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