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Promoted oxidation of diclofenac with ferrate (Fe(VI)): Role of ABTS as the electron shuttle.
J Hazard Mater. 2017 Aug 15; 336:65-70.JH

Abstract

Reaction of Fe(VI) with 2,2'-azino-bis-(3-ethylbenzothiazoline -6-sulfonate) (ABTS) is widely adopted to determine aqueous ferrate (Fe(VI)) concentration based on ABTS+ formation. Interestingly, this study found that the addition of ABTS could accelerate the oxidation of diclofenac (DCF) by Fe(VI) significantly. Observed first-order rate constant of DCF in the presence of 30μM ABTS was found to be 36.2 folds of that without ABTS, with values of 3.08 and 0.085min-1, respectively. It was partly attributed to the formation of ABTS+. The apparent second-order rate constant (kapp) for the oxidation of ABTS by Fe(VI) at pH7.0 was determined to be 1.1×106M-1s-1, which was 3-5 orders of magnitude higher than those for the reactions of ABTS+ with DCF (kapp,ABTS+-DCF=2.8×103M-1s-1) and Fe(VI) with DCF (kapp,Fe(VI)-DCF=17.7M-1s-1). Both the kapp,Fe(VI)-ABTS and kapp,Fe(VI)-DCF decreased obviously with increasing pH, while the kapp,ABTS+-DCF exhibited little pH dependency. By acting as the electron shuttle, ABTS could enhance the removal efficiency of DCF over wide pH and natural organic matter concentration ranges. This study provides new insights to reconsider the role of organic matter during Fe(VI) oxidation and highlights the potential for increasing the reactivity of Fe(VI).

Authors+Show Affiliations

Key Laboratory of Drinking Water Science and Technology, Research Center for Eco-Environmental Sciences, University of Chinese Academy of Sciences, Chinese Academy of Sciences,18 Shuang-qing Road, Beijing 100085, China.Key Laboratory of Drinking Water Science and Technology, Research Center for Eco-Environmental Sciences, University of Chinese Academy of Sciences, Chinese Academy of Sciences,18 Shuang-qing Road, Beijing 100085, China. Electronic address: qiangz@rcees.ac.cn.School of Architectural, Surveying and Mapping Engineering, Jiangxi University of Science and Technology,86 Hong-qi Road, Ganzhou 341000, China.Key Laboratory of Drinking Water Science and Technology, Research Center for Eco-Environmental Sciences, University of Chinese Academy of Sciences, Chinese Academy of Sciences,18 Shuang-qing Road, Beijing 100085, China.

Pub Type(s)

Journal Article

Language

eng

PubMed ID

28472710

Citation

Dong, Huiyu, et al. "Promoted Oxidation of Diclofenac With Ferrate (Fe(VI)): Role of ABTS as the Electron Shuttle." Journal of Hazardous Materials, vol. 336, 2017, pp. 65-70.
Dong H, Qiang Z, Lian J, et al. Promoted oxidation of diclofenac with ferrate (Fe(VI)): Role of ABTS as the electron shuttle. J Hazard Mater. 2017;336:65-70.
Dong, H., Qiang, Z., Lian, J., & Qu, J. (2017). Promoted oxidation of diclofenac with ferrate (Fe(VI)): Role of ABTS as the electron shuttle. Journal of Hazardous Materials, 336, 65-70. https://doi.org/10.1016/j.jhazmat.2017.04.056
Dong H, et al. Promoted Oxidation of Diclofenac With Ferrate (Fe(VI)): Role of ABTS as the Electron Shuttle. J Hazard Mater. 2017 Aug 15;336:65-70. PubMed PMID: 28472710.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Promoted oxidation of diclofenac with ferrate (Fe(VI)): Role of ABTS as the electron shuttle. AU - Dong,Huiyu, AU - Qiang,Zhimin, AU - Lian,Junfeng, AU - Qu,Jiuhui, Y1 - 2017/04/25/ PY - 2017/02/05/received PY - 2017/04/20/revised PY - 2017/04/21/accepted PY - 2017/5/5/pubmed PY - 2017/5/5/medline PY - 2017/5/5/entrez KW - ABTS KW - Diclofenac KW - Electron shuttle KW - Ferrate SP - 65 EP - 70 JF - Journal of hazardous materials JO - J Hazard Mater VL - 336 N2 - Reaction of Fe(VI) with 2,2'-azino-bis-(3-ethylbenzothiazoline -6-sulfonate) (ABTS) is widely adopted to determine aqueous ferrate (Fe(VI)) concentration based on ABTS+ formation. Interestingly, this study found that the addition of ABTS could accelerate the oxidation of diclofenac (DCF) by Fe(VI) significantly. Observed first-order rate constant of DCF in the presence of 30μM ABTS was found to be 36.2 folds of that without ABTS, with values of 3.08 and 0.085min-1, respectively. It was partly attributed to the formation of ABTS+. The apparent second-order rate constant (kapp) for the oxidation of ABTS by Fe(VI) at pH7.0 was determined to be 1.1×106M-1s-1, which was 3-5 orders of magnitude higher than those for the reactions of ABTS+ with DCF (kapp,ABTS+-DCF=2.8×103M-1s-1) and Fe(VI) with DCF (kapp,Fe(VI)-DCF=17.7M-1s-1). Both the kapp,Fe(VI)-ABTS and kapp,Fe(VI)-DCF decreased obviously with increasing pH, while the kapp,ABTS+-DCF exhibited little pH dependency. By acting as the electron shuttle, ABTS could enhance the removal efficiency of DCF over wide pH and natural organic matter concentration ranges. This study provides new insights to reconsider the role of organic matter during Fe(VI) oxidation and highlights the potential for increasing the reactivity of Fe(VI). SN - 1873-3336 UR - https://www.unboundmedicine.com/medline/citation/28472710/Promoted_oxidation_of_diclofenac_with_ferrate__Fe_VI__:_Role_of_ABTS_as_the_electron_shuttle_ L2 - https://linkinghub.elsevier.com/retrieve/pii/S0304-3894(17)30312-6 DB - PRIME DP - Unbound Medicine ER -
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