TY - JOUR
T1 - Ametryn degradation in the ultraviolet (UV) irradiation/hydrogen peroxide (H2O2) treatment
AU - Gao, Nai yun
AU - Deng, Yang
AU - Zhao, Dandan
PY - 2009/5/30
Y1 - 2009/5/30
N2 - Ultraviolet (UV) irradiation (253.7 nm) in the presence of hydrogen peroxide (H2O2) was used to decompose aqueous ametryn. The concentrations of ametryn were measured with time under various experiment conditions. The investigated factors included H2O2 dosages, initial pH, initial ametryn concentrations, and a variety of inorganic anions. Results showed that ametryn degradation in UV/H2O2 process was a pseudo-first-order reaction. Removal rates of ametryn were greatly affected by H2O2 dosage and initial concentrations of ametryn, but appeared to be slightly influenced by initial pH. Furthermore, we investigated the effects of four anions (SO42-, Cl-, HCO3-, and CO32-) on ametryn degradation by UV/H2O2. The impact of SO42- seemed to be insignificant; however, Cl-, HCO3-, and CO32- considerably slowed down the degradation rate because they could strongly scavenge hydroxyl radicals (OH{radical dot}) produced during the UV/H2O2 process. Finally, a preliminary cost analysis revealed that UV/H2O2 process was more cost-effective than the UV alone in removal of ametryn from water.
AB - Ultraviolet (UV) irradiation (253.7 nm) in the presence of hydrogen peroxide (H2O2) was used to decompose aqueous ametryn. The concentrations of ametryn were measured with time under various experiment conditions. The investigated factors included H2O2 dosages, initial pH, initial ametryn concentrations, and a variety of inorganic anions. Results showed that ametryn degradation in UV/H2O2 process was a pseudo-first-order reaction. Removal rates of ametryn were greatly affected by H2O2 dosage and initial concentrations of ametryn, but appeared to be slightly influenced by initial pH. Furthermore, we investigated the effects of four anions (SO42-, Cl-, HCO3-, and CO32-) on ametryn degradation by UV/H2O2. The impact of SO42- seemed to be insignificant; however, Cl-, HCO3-, and CO32- considerably slowed down the degradation rate because they could strongly scavenge hydroxyl radicals (OH{radical dot}) produced during the UV/H2O2 process. Finally, a preliminary cost analysis revealed that UV/H2O2 process was more cost-effective than the UV alone in removal of ametryn from water.
KW - Ametryn
KW - Hydrogen peroxide
KW - Oxidation
KW - Ultraviolet irradiation
UR - http://www.scopus.com/inward/record.url?scp=62649101287&partnerID=8YFLogxK
U2 - 10.1016/j.jhazmat.2008.08.038
DO - 10.1016/j.jhazmat.2008.08.038
M3 - Article
C2 - 18824296
AN - SCOPUS:62649101287
SN - 0304-3894
VL - 164
SP - 640
EP - 645
JO - Journal of Hazardous Materials
JF - Journal of Hazardous Materials
IS - 2-3
ER -