Imperial College London
Alternate

Professor Michael Templeton

Faculty of Engineering, Department of Civil and Environmental Engineering

Professor of Public Health Engineering
 
 
 
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Contact

 

+44 (0)20 7594 6099m.templeton

 
 
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Assistant

 

Miss Judith Barritt +44 (0)20 7594 5967

 
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Location

 

303Skempton BuildingSouth Kensington Campus

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Summary

 

Publications

Citation

BibTex format

@article{Semitsoglou-Tsiapou:2016:10.1016/j.watres.2016.01.017,
author = {Semitsoglou-Tsiapou, S and Templeton, MR and Graham, NJD and Hernandez, Leal L and Martijn, BJ and Royce, A and Kruithof, JC},
doi = {10.1016/j.watres.2016.01.017},
journal = {Water Research},
pages = {285--294},
title = {Low pressure UV/H2O2 treatment for the degradation of the pesticides metaldehyde, clopyralid and mecoprop – kinetics and reaction product formation},
url = {http://dx.doi.org/10.1016/j.watres.2016.01.017},
volume = {91},
year = {2016}
}
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RIS format (EndNote, RefMan)

TY  - JOUR
AB  - The degradation kinetics of three pesticides – metaldehyde, clopyralid and mecoprop – by ultraviolet photolysis and hydroxyl radical oxidation by low pressure ultraviolet hydrogen peroxide (LP-UV/H2O2) advanced oxidation was determined. Mecoprop was susceptible to both LP-UV photolysis and hydroxyl radical oxidation, and exhibited the fastest degradation kinetics, achieving 99.6% (2.4-log) degradation with a UV fluence of 800 mJ/cm2 and 5 mg/L hydrogen peroxide. Metaldehyde was poorly degraded by LP-UV photolysis while 97.7% (1.6-log) degradation was achieved with LP-UV/H2O2 treatment at the maximum tested UV fluence of 1000 mJ/cm2 and 15 mg/L hydrogen peroxide. Clopyralid was hardly susceptible to LP-UV photolysis and exhibited the lowest degradation by LP-UV/H2O2 among the three pesticides. The second-order reaction rate constants for the reactions between the pesticides and OH-radicals were calculated applying a kinetic model for LP-UV/H2O2 treatment to be 3.6 × 108, 2.0 × 108 and 1.1 × 109 M−1 s−1 for metaldehyde, clopyralid and mecoprop, respectively. The main LP-UV photolysis reaction product from mecoprop was 2-(4-hydroxy-2-methylphenoxy) propanoic acid, while photo-oxidation by LP-UV/H2O2 treatment formed several oxidation products. The photo-oxidation of clopyralid involved either hydroxylation or dechlorination of the ring, while metaldehyde underwent hydroxylation and produced acetic acid as a major end product. Based on the findings, degradation pathways for the three pesticides by LP-UV/H2O2 treatment were proposed.
AU  - Semitsoglou-Tsiapou,S
AU  - Templeton,MR
AU  - Graham,NJD
AU  - Hernandez,Leal L
AU  - Martijn,BJ
AU  - Royce,A
AU  - Kruithof,JC
DO  - 10.1016/j.watres.2016.01.017
EP  - 294
PY  - 2016///
SN  - 0043-1354
SP  - 285
TI  - Low pressure UV/H2O2 treatment for the degradation of the pesticides metaldehyde, clopyralid and mecoprop – kinetics and reaction product formation
T2  - Water Research
UR  - http://dx.doi.org/10.1016/j.watres.2016.01.017
UR  - https://www.sciencedirect.com/science/article/pii/S0043135416300173
UR  - http://hdl.handle.net/10044/1/30303
VL  - 91
ER  -
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