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Số người truy cập: 109,908,009
Effect of the chloride ion on the degradation of PPCPs in UV/persulfate and UV/H
2
O
2
and the role of radicals in these systems
Tác giả hoặc Nhóm tác giả:
Nguyen Tien Hoang, Tran Duc Manh, NC Thuy Tram, Bui Dinh Nhi, Fredrick M Mwazighe, Dinh Van Tac, Vu Thi Duyen, Y Hoang Hien, Nguyen Thi Thy Nga, Doan Van Duong, Lan Tran Thi, Thi Van Doan
Nơi đăng:
Journal of Environmental Chemical Engineering;
S
ố:
12;
Từ->đến trang
: 111846;
Năm:
2024
Lĩnh vực:
Khoa học;
Loại:
Bài báo khoa học;
Thể loại:
Quốc tế
TÓM TẮT
This work comprehensively studied the kinetic degradation of ciprofloxacin (CIP), levofloxacin (LEV), and sulfanilamide (SAA) by UV/PS/Cl and UV/H2O2/Cl. UV contributed to the degradation of SAA to a great extent, resulting in the highest degradation, compared with the other PPCPs. 10 mM of Cl- slightly enhanced the degradation of LEV and SAA, while higher concentrations of Cl- (up to 1000 mM) inhibited the degradation of all the PPCPs in most processes. Increasing the concentration of Cl- to 1000 mM resulted in the decrease in the concentrations of •OH (which decreased by 88 – 96%) and SO4•- (which decreased by 67.4%) in UV/PS/Cl. With the increase in the concentration of Cl- to 1000 mM, the contributions of •OH and SO4•- to the degradation of the PPCPs were almost completely masked by the contribution of Cl• (except in the case of SAA). The relationship between the natural logarithms of the second-order rate constant of SO4•- and Cl• with PPCPs versus the Hammett constant was established and used to determine the second-order rate constant of SAA towards SO4•-. Acidic pH and neutral pH were conducive for the degradation of the PPCPs in the process. The presence of various constituents, including anions (i.e., HCO3-, SO42-, and NO3-) and metal cations (i.e., Fe2+, Ni2+, Co2+ and Mn2+) inhibited the degradation rate of the PPCPs to varying degrees. In the presence of 10 mM Cl- and other anions, •OH and SO4•- were consumed by Cl-, up to 71 – 90% and 8 – 10% in UV/PS/Cl, respectively. Toxicity assessment showed that 10 mM Cl- in UV/PS/Cl and UV/H2O2/Cl did not cause any significant inhibition on the growth of
Chlorella vulgaris
and
Escherichia coli
(
E.Coli
), compared with that in the absence of Cl-. In summary, Cl• is an important radical that can replace •OH and SO4•- in UV/PS or UV/H2O2 under saline conditions.
ABSTRACT
This work comprehensively studied the kinetic degradation of ciprofloxacin (CIP), levofloxacin (LEV), and sulfanilamide (SAA) by UV/PS/Cl and UV/H2O2/Cl. UV contributed to the degradation of SAA to a great extent, resulting in the highest degradation, compared with the other PPCPs. 10 mM of Cl- slightly enhanced the degradation of LEV and SAA, while higher concentrations of Cl- (up to 1000 mM) inhibited the degradation of all the PPCPs in most processes. Increasing the concentration of Cl- to 1000 mM resulted in the decrease in the concentrations of •OH (which decreased by 88 – 96%) and SO4•- (which decreased by 67.4%) in UV/PS/Cl. With the increase in the concentration of Cl- to 1000 mM, the contributions of •OH and SO4•- to the degradation of the PPCPs were almost completely masked by the contribution of Cl• (except in the case of SAA). The relationship between the natural logarithms of the second-order rate constant of SO4•- and Cl• with PPCPs versus the Hammett constant was established and used to determine the second-order rate constant of SAA towards SO4•-. Acidic pH and neutral pH were conducive for the degradation of the PPCPs in the process. The presence of various constituents, including anions (i.e., HCO3-, SO42-, and NO3-) and metal cations (i.e., Fe2+, Ni2+, Co2+ and Mn2+) inhibited the degradation rate of the PPCPs to varying degrees. In the presence of 10 mM Cl- and other anions, •OH and SO4•- were consumed by Cl-, up to 71 – 90% and 8 – 10% in UV/PS/Cl, respectively. Toxicity assessment showed that 10 mM Cl- in UV/PS/Cl and UV/H2O2/Cl did not cause any significant inhibition on the growth of
Chlorella vulgaris
and
Escherichia coli
(
E.Coli
), compared with that in the absence of Cl-. In summary, Cl• is an important radical that can replace •OH and SO4•- in UV/PS or UV/H2O2 under saline conditions.
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