Abstract

The direct photolysis of 2‐chlorophenol (2‐CP), 4‐chlorophenol (4‐CP) and 2,4‐dichlorophenol (2,4‐DCP) in model aqueous solution was studied using UV XeBr (282 nm) and KrCl (222 nm) excilamps. The highest pseudo‐first order rate constants and quantum yields were found for molecular form of 4‐CP (at pH 2 and 5.7) and anionic forms of 2‐CP and 2,4‐DCP (at pH 11) when irradiated by XeBr excilamp. The maximum removal efficiency of molecular form of 2‐CP and 2,4‐DCP with the lowest UV dose of absorbed energy was observed using KrCl excilamp. On the contrary, the XeBr excilamp required the lowest dose (∼2 J⋅cm−2) for complete degradation of molecular 4‐CP and anionic 2‐CP. The highest removal efficiency of anionic form of 4‐CP (65%) was achieved when using KrCl excilamp.

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