Abstract
A medium-pressure mercury lamp, emitting strongly in the 200–400 nm range was applied for the degradation of 3,5,6-trichloro-2-pyridinol (TCP), a hydrolysis product of chlorpyrifos. Photodegradation of TCP in aqueous solution exhibited pseudo-first order kinetics with a rate constant that was wavelength dependent and increased below 300 nm. The TCP degradation rate and quantum yield increased with solution pH up to a constant maximum value of (6.40 ± 0.046) × 10−3 cm2 mJ− 1 and 0.178 ± 0.002 mol E−1 respectively, at pH 5 and above. Addition of 5 mg L− 1 H2O2 to generate OH radicals led to an increase in removal rates by a factor of 1.5. Addition of phosphate buffer resulted in decreased photolysis at 3 < pH < 6.
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Shemer, H., Sharpless, C.M. & Linden, K.G. Photodegradation of 3,5,6-trichloro-2-pyridinol in aqueous solution. Water Air Soil Pollut 168, 145–155 (2005). https://doi.org/10.1007/s11270-005-0960-z
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DOI: https://doi.org/10.1007/s11270-005-0960-z