Degradation of antibiotics by modified vacuum-UV based processes: Mechanistic consequences of H                         2                         O                         2                          and K                         2                         S                         2                         O                         8                          in the presence of halide ions

Yuqing Sun; Dong Wan Cho; Nigel J.D. Graham; Deyi Hou; Alex C.K. Yip; Eakalak Khan; Hocheol Song; Yaru Li; Daniel C.W. Tsang

doi:10.1016/j.scitotenv.2019.02.006

Degradation of antibiotics by modified vacuum-UV based processes: Mechanistic consequences of H ₂ O ₂ and K ₂ S ₂ O ₈ in the presence of halide ions

Yuqing Sun, Dong Wan Cho, Nigel J.D. Graham, Deyi Hou, Alex C.K. Yip, Eakalak Khan, Hocheol Song, Yaru Li, Daniel C.W. Tsang

Research output: Journal article publication › Journal article › Academic research › peer-review

81 Citations (Scopus)

Abstract

In this work, the degradation of cefalexin, norfloxacin, and ofloxacin was examined via various advanced oxidation processes (AOPs). Direct photolysis by ultraviolet (UV) and vacuum ultra violet (VUV) was less effective for the degradation of fluoroquinolone antibiotics such as norfloxacin and ofloxacin than that of cefalexin. Both hydrogen peroxide (H ₂ O ₂ ) and potassium persulfate (K ₂ S ₂ O ₈ ) assisted UV/VUV process remarkably enhanced fluoroquinolone degradation. The addition of K ₂ S ₂ O ₈ was superior to H ₂ O ₂ under VUV irradiation, with the best removal efficiency of norfloxacin and ofloxacin being almost 100% within 3 min in the presence of VUV/K ₂ S ₂ O ₈ . The ofloxacin degradation rate was accelerated as concentrations of H ₂ O ₂ and K ₂ S ₂ O ₈ was increased to 3 mM, but the degradation rate was slightly decreased with excess H ₂ O ₂ (>3 mM). The performance of modified VUV processes (i.e., VUV/H ₂ O ₂ and VUV/K ₂ S ₂ O ₈ ) was inhibited at highly alkaline condition (pH 11). The co-existence of halides (Cl ⁻ and Br ⁻ ) enhanced antibiotics degradation via the modified VUV processes, but the reaction was almost unaffected in the presence of single halides. This study demonstrated that modified VUV processes (especially VUV/K ₂ S ₂ O ₈ ) are efficient for eliminating fluoroquinolone antibiotics from water, which can be considered as a clean and green method for the treatment of antibiotics-containing industrial wastewater.

Original language	English
Pages (from-to)	312-321
Number of pages	10
Journal	Science of the Total Environment
Volume	664
DOIs	https://doi.org/10.1016/j.scitotenv.2019.02.006
Publication status	Published - 10 May 2019

Keywords

Catalytic degradation
Chlorides/bromides
Fluoroquinolone antibiotics
Persulfate radicals
Sustainable remediation
Vacuum-ultraviolet light

ASJC Scopus subject areas

Environmental Engineering
Environmental Chemistry
Waste Management and Disposal
Pollution

More information

10.1016/j.scitotenv.2019.02.006

Cite this

Sun, Y., Cho, D. W., Graham, N. J. D., Hou, D., Yip, A. C. K., Khan, E., Song, H., Li, Y., & Tsang, D. C. W. (2019). Degradation of antibiotics by modified vacuum-UV based processes: Mechanistic consequences of H ₂ O ₂ and K ₂ S ₂ O ₈ in the presence of halide ions. Science of the Total Environment, 664, 312-321. https://doi.org/10.1016/j.scitotenv.2019.02.006

Sun, Yuqing ; Cho, Dong Wan ; Graham, Nigel J.D. et al. / Degradation of antibiotics by modified vacuum-UV based processes : Mechanistic consequences of H ₂ O ₂ and K ₂ S ₂ O ₈ in the presence of halide ions. In: Science of the Total Environment. 2019 ; Vol. 664. pp. 312-321.

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title = "Degradation of antibiotics by modified vacuum-UV based processes: Mechanistic consequences of H 2 O 2 and K 2 S 2 O 8 in the presence of halide ions",

abstract = " In this work, the degradation of cefalexin, norfloxacin, and ofloxacin was examined via various advanced oxidation processes (AOPs). Direct photolysis by ultraviolet (UV) and vacuum ultra violet (VUV) was less effective for the degradation of fluoroquinolone antibiotics such as norfloxacin and ofloxacin than that of cefalexin. Both hydrogen peroxide (H 2 O 2 ) and potassium persulfate (K 2 S 2 O 8 ) assisted UV/VUV process remarkably enhanced fluoroquinolone degradation. The addition of K 2 S 2 O 8 was superior to H 2 O 2 under VUV irradiation, with the best removal efficiency of norfloxacin and ofloxacin being almost 100% within 3 min in the presence of VUV/K 2 S 2 O 8 . The ofloxacin degradation rate was accelerated as concentrations of H 2 O 2 and K 2 S 2 O 8 was increased to 3 mM, but the degradation rate was slightly decreased with excess H 2 O 2 (>3 mM). The performance of modified VUV processes (i.e., VUV/H 2 O 2 and VUV/K 2 S 2 O 8 ) was inhibited at highly alkaline condition (pH 11). The co-existence of halides (Cl − and Br − ) enhanced antibiotics degradation via the modified VUV processes, but the reaction was almost unaffected in the presence of single halides. This study demonstrated that modified VUV processes (especially VUV/K 2 S 2 O 8 ) are efficient for eliminating fluoroquinolone antibiotics from water, which can be considered as a clean and green method for the treatment of antibiotics-containing industrial wastewater. ",

keywords = "Catalytic degradation, Chlorides/bromides, Fluoroquinolone antibiotics, Persulfate radicals, Sustainable remediation, Vacuum-ultraviolet light",

author = "Yuqing Sun and Cho, {Dong Wan} and Graham, {Nigel J.D.} and Deyi Hou and Yip, {Alex C.K.} and Eakalak Khan and Hocheol Song and Yaru Li and Tsang, {Daniel C.W.}",

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Sun, Y, Cho, DW, Graham, NJD, Hou, D, Yip, ACK, Khan, E, Song, H, Li, Y & Tsang, DCW 2019, 'Degradation of antibiotics by modified vacuum-UV based processes: Mechanistic consequences of H ₂ O ₂ and K ₂ S ₂ O ₈ in the presence of halide ions', Science of the Total Environment, vol. 664, pp. 312-321. https://doi.org/10.1016/j.scitotenv.2019.02.006

Degradation of antibiotics by modified vacuum-UV based processes : Mechanistic consequences of H ₂ O ₂ and K ₂ S ₂ O ₈ in the presence of halide ions. / Sun, Yuqing; Cho, Dong Wan; Graham, Nigel J.D. et al.

In: Science of the Total Environment, Vol. 664, 10.05.2019, p. 312-321.

Research output: Journal article publication › Journal article › Academic research › peer-review

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AU - Sun, Yuqing

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AU - Graham, Nigel J.D.

AU - Hou, Deyi

AU - Yip, Alex C.K.

AU - Khan, Eakalak

AU - Song, Hocheol

AU - Li, Yaru

AU - Tsang, Daniel C.W.

PY - 2019/5/10

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N2 - In this work, the degradation of cefalexin, norfloxacin, and ofloxacin was examined via various advanced oxidation processes (AOPs). Direct photolysis by ultraviolet (UV) and vacuum ultra violet (VUV) was less effective for the degradation of fluoroquinolone antibiotics such as norfloxacin and ofloxacin than that of cefalexin. Both hydrogen peroxide (H 2 O 2 ) and potassium persulfate (K 2 S 2 O 8 ) assisted UV/VUV process remarkably enhanced fluoroquinolone degradation. The addition of K 2 S 2 O 8 was superior to H 2 O 2 under VUV irradiation, with the best removal efficiency of norfloxacin and ofloxacin being almost 100% within 3 min in the presence of VUV/K 2 S 2 O 8 . The ofloxacin degradation rate was accelerated as concentrations of H 2 O 2 and K 2 S 2 O 8 was increased to 3 mM, but the degradation rate was slightly decreased with excess H 2 O 2 (>3 mM). The performance of modified VUV processes (i.e., VUV/H 2 O 2 and VUV/K 2 S 2 O 8 ) was inhibited at highly alkaline condition (pH 11). The co-existence of halides (Cl − and Br − ) enhanced antibiotics degradation via the modified VUV processes, but the reaction was almost unaffected in the presence of single halides. This study demonstrated that modified VUV processes (especially VUV/K 2 S 2 O 8 ) are efficient for eliminating fluoroquinolone antibiotics from water, which can be considered as a clean and green method for the treatment of antibiotics-containing industrial wastewater.

AB - In this work, the degradation of cefalexin, norfloxacin, and ofloxacin was examined via various advanced oxidation processes (AOPs). Direct photolysis by ultraviolet (UV) and vacuum ultra violet (VUV) was less effective for the degradation of fluoroquinolone antibiotics such as norfloxacin and ofloxacin than that of cefalexin. Both hydrogen peroxide (H 2 O 2 ) and potassium persulfate (K 2 S 2 O 8 ) assisted UV/VUV process remarkably enhanced fluoroquinolone degradation. The addition of K 2 S 2 O 8 was superior to H 2 O 2 under VUV irradiation, with the best removal efficiency of norfloxacin and ofloxacin being almost 100% within 3 min in the presence of VUV/K 2 S 2 O 8 . The ofloxacin degradation rate was accelerated as concentrations of H 2 O 2 and K 2 S 2 O 8 was increased to 3 mM, but the degradation rate was slightly decreased with excess H 2 O 2 (>3 mM). The performance of modified VUV processes (i.e., VUV/H 2 O 2 and VUV/K 2 S 2 O 8 ) was inhibited at highly alkaline condition (pH 11). The co-existence of halides (Cl − and Br − ) enhanced antibiotics degradation via the modified VUV processes, but the reaction was almost unaffected in the presence of single halides. This study demonstrated that modified VUV processes (especially VUV/K 2 S 2 O 8 ) are efficient for eliminating fluoroquinolone antibiotics from water, which can be considered as a clean and green method for the treatment of antibiotics-containing industrial wastewater.

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KW - Persulfate radicals

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Sun Y, Cho DW, Graham NJD, Hou D, Yip ACK, Khan E et al. Degradation of antibiotics by modified vacuum-UV based processes: Mechanistic consequences of H ₂ O ₂ and K ₂ S ₂ O ₈ in the presence of halide ions. Science of the Total Environment. 2019 May 10;664:312-321. doi: 10.1016/j.scitotenv.2019.02.006