Abstract: The degradation of Microcystin-LR (MC-LR) in water by hydrogen peroxide assisted ultraviolet (UV/H₂O₂) process was investigated in this paper. The UV/H₂O₂ process appeared to be effective in removal of the MC-LR. MC-LR decomposition was primarily ascribed to production of strong and nonselective oxidant-hydroxyl radicals within the system. The intensity of UV radiation, initial concentration of MC-LR, MC-LR purity, dosages of H₂O₂, the initial solution pH, and anions present in water, to some extent, influenced the degradation rate of MC-LR. A modified pseudo-first-order kinetic model was developed to predict the removal efficiency under different experimental conditions.

Key words: Microcystin-LR (MC-LR), Hydrogen peroxide assisted ultraviolet (UV/H₂O₂) process, Hydroxyl radical, Reaction kinetics, Photochemical degradation

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