Degradation of pesticides chlorpyrifos, cypermethrin and chlorothalonil in aqueous solution by TiO2 photocatalysis

Affam, A.C. and Chaudhuri, M. (2013) Degradation of pesticides chlorpyrifos, cypermethrin and chlorothalonil in aqueous solution by TiO2 photocatalysis. Journal of Environmental Management, 130. pp. 160-165.

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Abstract

Degradation of pesticides chlorpyrifos, cypermethrin and chlorothalonil in aqueous solution by TiO2 photocatalysis under UVA (365nm) irradiation was examined. Enhancement of degradation and improvement in biodegradability index (BOD5/COD ratio) by H2O2 addition were also evaluated. UVA irradiation per se produced insignificant degradation of the pesticides. In UV/TiO2 photocatalysis (TiO2 1.5gL-1, pH 6 and 300min irradiation), COD and TOC removal were 25.95 and 8.45, respectively. In UV/TiO2/H2O2 photocatalysis (TiO2 1.5gL-1, H2O2 100mgL-1, pH 6 and 300min irradiation), COD and TOC removal were 53.62 and 21.54, respectively and biodegradability index improved to 0.26. Ammonia-nitrogen (NH3-N) decreased from 22 to 7.8mgL-1 and nitrate-nitrogen (NO3--N) increased from 0.7 to 13.8mgL-1 in 300min, indicating mineralization. Photocatalytic degradation followed pseudo-first order kinetics with rate constant (k) of 0.0025 and 0.0008min-1 for COD and TOC removal, respectively. FTIR spectra indicated degradation of the organic bonds of the pesticides. UV/TiO2/H2O2 photocatalysis is effective in degradation of pesticides chlorpyrifos, cypermethrin and chlorothalonil in aqueous solution. UV/TiO2/H2O2 photocatalysis may be applied as pretreatment of a chlorpyrifos, cypermethrin and chlorothalonil pesticide wastewater at pH 6, for biological treatment. © 2013 Elsevier Ltd.

Item Type: Article
Impact Factor: cited By 125
Uncontrolled Keywords: ammonia; chlorothalonil; chlorpyrifos; cipermethrin; hydrogen peroxide; nitrate; nitrogen; titanium dioxide, aqueous solution; biological analysis; catalysis; degradation; light effect; pesticide; photochemistry; removal experiment; waste management; wastewater, aqueous solution; article; biodegradability; chemical bond; degradation; mineralization; pH; photocatalysis; ultraviolet A radiation, Chlorothalonil; Chlorpyrifos; Cypermethrin; Pesticide; Photocatalysis; UV/TiO(2); UV/TiO(2)/H(2)O(2), Chlorpyrifos; Environmental Remediation; Kinetics; Nitriles; Pesticides; Photolysis; Pyrethrins; Spectroscopy, Fourier Transform Infrared; Titanium
Depositing User: Ms Sharifah Fahimah Saiyed Yeop
Date Deposited: 29 Mar 2022 14:06
Last Modified: 29 Mar 2022 14:06
URI: http://scholars.utp.edu.my/id/eprint/32567

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