TY - JOUR
T1 - Photo-persulfate oxidation and mineralization of benzoic acid
T2 - Kinetics and optimization under UVC irradiation
AU - Sugihartono, Valencia Elvira
AU - Mahasti, Nicolaus N.N.
AU - Shih, Yu Jen
AU - Huang, Yao Hui
N1 - Funding Information:
The authors would like to thank to the Ministry of Science and Technology, Taiwan for the financial support under contract no. MOST 110-2622-E-006-024-CC2 .
Publisher Copyright:
© 2022 Elsevier Ltd
PY - 2022/6
Y1 - 2022/6
N2 - The strong oxidant, persulfate (PS, S2O82−), was applied to treat the synthetic wastewater of benzoic acid (BA) under UV irradiation. UVC light initiated a chain reaction that derived the sulfate radical (SO4•-) and hydroxyl radical (HO•) from S2O82− ion. The experiment parameters, including light irradiation (UVA and UVC), pH, dose ratio ([PS]0/[BA]0), initial concentration ([BA]0, mg/L), was optimized based on degradation efficiency and total organic carbon (TOC) removal of BA, which reached up to 100% and 96%, respectively, under pH 3.0. The best dose ratio was close to equivalent stoichiometry (and [PS]0/[BA]0 = 15) for the treatment of 100 mg-BA/L, suggesting that UV/S2O82− was able to completely convert BA to carbon dioxide and water. The scavenging test showed that SO4•- contributed to about 60% of degradation rate, which the HO• predominated the mineralization rate, i.e., TOC removal. A consecutive kinetic model was proposed to clarify the reaction sequence and rate-determining factor of photo-persulfate oxidation for benzoic acid.
AB - The strong oxidant, persulfate (PS, S2O82−), was applied to treat the synthetic wastewater of benzoic acid (BA) under UV irradiation. UVC light initiated a chain reaction that derived the sulfate radical (SO4•-) and hydroxyl radical (HO•) from S2O82− ion. The experiment parameters, including light irradiation (UVA and UVC), pH, dose ratio ([PS]0/[BA]0), initial concentration ([BA]0, mg/L), was optimized based on degradation efficiency and total organic carbon (TOC) removal of BA, which reached up to 100% and 96%, respectively, under pH 3.0. The best dose ratio was close to equivalent stoichiometry (and [PS]0/[BA]0 = 15) for the treatment of 100 mg-BA/L, suggesting that UV/S2O82− was able to completely convert BA to carbon dioxide and water. The scavenging test showed that SO4•- contributed to about 60% of degradation rate, which the HO• predominated the mineralization rate, i.e., TOC removal. A consecutive kinetic model was proposed to clarify the reaction sequence and rate-determining factor of photo-persulfate oxidation for benzoic acid.
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U2 - 10.1016/j.chemosphere.2022.133663
DO - 10.1016/j.chemosphere.2022.133663
M3 - Article
C2 - 35063559
AN - SCOPUS:85124616629
SN - 0045-6535
VL - 296
JO - Chemosphere
JF - Chemosphere
M1 - 133663
ER -