Abstract
Abstract This paper mainly focuses on the influence of inorganic oxidants and metal ions on the TiO 2 , ZnO sensitized photodegradation of 4-fluorophenol (4-FP) by UV-A light. TiO 2 -P25 is more efficient than ZnO. Among the oxidants periodate ion was found to be more efficient than others in improving the degradation of 4-FP via formation of reactive radicals. The effect of oxidants on the degradation of 4-FP was found to be in the order of IO 4 − > BrO 3 − > S 2 O 8 2− H 2 O 2 > ClO 3 − . The effect of metal ions on degradation of 4-FP was found to be in the order of Mg 2+ > Fe 3+ > Fe 2+ > Cu 2+ . The degradation of 4-FP follows pseudo -first order kinetics according to the Langmuir–Hinshelwood model. The photomineralisation has also been confirmed by COD, gas chromatography and fluoride ion measurements.
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