relation: https://khub.utp.edu.my/scholars/3337/
title: Degradation of pesticides chlorpyrifos, cypermethrin and chlorothalonil in aqueous solution by TiO2 photocatalysis
creator: Affam, A.C.
creator: Chaudhuri, M.
description: 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.
publisher: Academic Press
date: 2013
type: Article
type: PeerReviewed
identifier:   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.  ISSN 03014797     
relation: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84884726920&doi=10.1016%2fj.jenvman.2013.08.058&partnerID=40&md5=ebcad6e8df323bf7fbe2b75297930467
relation: 10.1016/j.jenvman.2013.08.058
identifier: 10.1016/j.jenvman.2013.08.058