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Kinetics and mechanism of diclofenac removal using ferrate(VI): roles of Fe3+, Fe2+, and Mn2.
Environ Sci Pollut Res Int. 2018 Aug; 25(23):22998-23008.ES

Abstract

In this study, the effect of Fe3+, Fe2+, and Mn2+ dose, solution pH, reaction temperature, background water matrix (i.e., inorganic anions, cations, and natural organic matters (NOM)), and the kinetics and mechanism for the reaction system of Fe(VI)/Fe3+, Fe(VI)/Fe2+, and Fe(VI)/Mn2+ were investigated systematically. Traces of Fe3+, Fe2+, and Mn2+ promoted the DCF removal by Fe(VI) significantly. The pseudo-first-order rate constant (kobs) of DCF increased with decreasing pH (9-6) and increasing temperature (10-30 °C) due to the gradually reduced stability and enhanced reactivity of Fe(VI). Cu2+ and Zn2+ ions evidently improved the DCF removal, while CO32- restrained it. Besides, SO42-, Cl-, NO3-, Mg2+, and Ca2+ almost had no influence on the degradation of DCF by Fe(VI)/Fe3+, Fe(VI)/Fe2+, and Fe(VI)/Mn2+ within the tested concentration. The addition of 5 or 20 mg L-1 NOM decreased the removal efficiency of DCF. Moreover, Fe2O3 and Fe(OH)3, the by-products of Fe(VI), slightly inhibited the DCF removal, while α-FeOOH, another by-product of Fe(VI), showed no influence at pH 7. In addition, MnO2 and MnO4-, the by-products of Mn2+, enhanced the DCF degradation due to catalysis and superposition of oxidation capacity, respectively. This study indicates that Fe3+ and Fe2+ promoted the DCF removal mainly via the self-catalysis for Fe(VI), and meanwhile, the catalysis of Mn2+ and the effect of its by-products (i.e., MnO2 and MnO4-) contributed synchronously for DCF degradation. Graphical abstract ᅟ.

Authors+Show Affiliations

Faculty of Geosciences and Environmental Engineering, Southwest Jiaotong University, Chengdu, 611756, China.Faculty of Geosciences and Environmental Engineering, Southwest Jiaotong University, Chengdu, 611756, China. wangqun_hit@126.com.Faculty of Geosciences and Environmental Engineering, Southwest Jiaotong University, Chengdu, 611756, China. fuyosh@163.com.Faculty of Geosciences and Environmental Engineering, Southwest Jiaotong University, Chengdu, 611756, China.Faculty of Geosciences and Environmental Engineering, Southwest Jiaotong University, Chengdu, 611756, China.

Pub Type(s)

Journal Article

Language

eng

PubMed ID

29858998

Citation

Zhao, Junfeng, et al. "Kinetics and Mechanism of Diclofenac Removal Using ferrate(VI): Roles of Fe3+, Fe2+, and Mn2." Environmental Science and Pollution Research International, vol. 25, no. 23, 2018, pp. 22998-23008.
Zhao J, Wang Q, Fu Y, et al. Kinetics and mechanism of diclofenac removal using ferrate(VI): roles of Fe3+, Fe2+, and Mn2. Environ Sci Pollut Res Int. 2018;25(23):22998-23008.
Zhao, J., Wang, Q., Fu, Y., Peng, B., & Zhou, G. (2018). Kinetics and mechanism of diclofenac removal using ferrate(VI): roles of Fe3+, Fe2+, and Mn2. Environmental Science and Pollution Research International, 25(23), 22998-23008. https://doi.org/10.1007/s11356-018-2375-6
Zhao J, et al. Kinetics and Mechanism of Diclofenac Removal Using ferrate(VI): Roles of Fe3+, Fe2+, and Mn2. Environ Sci Pollut Res Int. 2018;25(23):22998-23008. PubMed PMID: 29858998.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Kinetics and mechanism of diclofenac removal using ferrate(VI): roles of Fe3+, Fe2+, and Mn2. AU - Zhao,Junfeng, AU - Wang,Qun, AU - Fu,Yongsheng, AU - Peng,Bo, AU - Zhou,Gaofeng, Y1 - 2018/06/01/ PY - 2018/01/20/received PY - 2018/05/22/accepted PY - 2018/6/3/pubmed PY - 2019/1/15/medline PY - 2018/6/3/entrez KW - Anionic effect KW - By-products KW - Cationic effect KW - Diclofenac KW - Ferrate SP - 22998 EP - 23008 JF - Environmental science and pollution research international JO - Environ Sci Pollut Res Int VL - 25 IS - 23 N2 - In this study, the effect of Fe3+, Fe2+, and Mn2+ dose, solution pH, reaction temperature, background water matrix (i.e., inorganic anions, cations, and natural organic matters (NOM)), and the kinetics and mechanism for the reaction system of Fe(VI)/Fe3+, Fe(VI)/Fe2+, and Fe(VI)/Mn2+ were investigated systematically. Traces of Fe3+, Fe2+, and Mn2+ promoted the DCF removal by Fe(VI) significantly. The pseudo-first-order rate constant (kobs) of DCF increased with decreasing pH (9-6) and increasing temperature (10-30 °C) due to the gradually reduced stability and enhanced reactivity of Fe(VI). Cu2+ and Zn2+ ions evidently improved the DCF removal, while CO32- restrained it. Besides, SO42-, Cl-, NO3-, Mg2+, and Ca2+ almost had no influence on the degradation of DCF by Fe(VI)/Fe3+, Fe(VI)/Fe2+, and Fe(VI)/Mn2+ within the tested concentration. The addition of 5 or 20 mg L-1 NOM decreased the removal efficiency of DCF. Moreover, Fe2O3 and Fe(OH)3, the by-products of Fe(VI), slightly inhibited the DCF removal, while α-FeOOH, another by-product of Fe(VI), showed no influence at pH 7. In addition, MnO2 and MnO4-, the by-products of Mn2+, enhanced the DCF degradation due to catalysis and superposition of oxidation capacity, respectively. This study indicates that Fe3+ and Fe2+ promoted the DCF removal mainly via the self-catalysis for Fe(VI), and meanwhile, the catalysis of Mn2+ and the effect of its by-products (i.e., MnO2 and MnO4-) contributed synchronously for DCF degradation. Graphical abstract ᅟ. SN - 1614-7499 UR - https://www.unboundmedicine.com/medline/citation/29858998/Kinetics_and_mechanism_of_diclofenac_removal_using_ferrate_VI_:_roles_of_Fe3+_Fe2+_and_Mn2_ L2 - https://dx.doi.org/10.1007/s11356-018-2375-6 DB - PRIME DP - Unbound Medicine ER -