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Rapid removal of organic pollutants by activation sulfite with ferrate.
Chemosphere. 2017 Nov; 186:576-579.C

Abstract

With the addition of sulfite, almost complete removal of seven out of eight tested contaminants, i.e. benzotriazole, phenol, ciprofloxacin, methyl blue, rhodamine B, methyl orange and sulfamethoxazole, was observed in 30 s except for sulfamethoxazole at pH 9.0, while Fe(VI) alone only resulted in less than 6% removal. In this study, the mechanism of sulfite/Fe(VI) process was explored for the first time. Firstly, sulfite attacks Fe(VI) via a 1-e- transfer forming the primary sulfite radical (SO3-), then SO3- reacts rapidly with oxygen in a diffusion controlled rate to form a much more reactive peroxyl radical SO5-, which further reacts with HSO3- and produces SO4-. All the signals of sulfite, sulfate and hydroxyl radicals were observed in the electron spin resonance (ESR) analysis. The DMPO and alcohol quenching experiments confirmed that sulfite/Fe(VI) process involves radicals as the plausible reactive species for decomposition of organic pollutants, and SO4·-/·OH instead of SO3-/SO5- are the major reactive oxygen species. Since oxygen participates in the formation of the secondary radicals, i.e. SO5-, SO4- and ·OH, the sulfite/Fe(VI) process open to air displayed better performance than that purged with nitrogen. Compared with previous sulfite/Cr(VI) and sulfite/Mn(VII) processes, which are only effective under acidic conditions, sulfite/Fe(VI) process provides an alternative under neutral and alkaline conditions. The extraordinarily fast oxidation of pollutants in sulfite/Fe(VI) process suggests that activation of sulfite by Fe(VI) might lead to a new class of advanced oxidation processes (AOPs) in water treatment.

Authors+Show Affiliations

Key Laboratory of Integrated Regulation and Resource Development on Shallow Lakes of Ministry of Education, College of Environment, Hohai University, Nanjing 210098, China. Electronic address: zhang_jing@hhu.edu.cn.Key Laboratory of Integrated Regulation and Resource Development on Shallow Lakes of Ministry of Education, College of Environment, Hohai University, Nanjing 210098, China.Key Laboratory of Integrated Regulation and Resource Development on Shallow Lakes of Ministry of Education, College of Environment, Hohai University, Nanjing 210098, China.Key Laboratory of Integrated Regulation and Resource Development on Shallow Lakes of Ministry of Education, College of Environment, Hohai University, Nanjing 210098, China.

Pub Type(s)

Journal Article

Language

eng

PubMed ID

28810226

Citation

Zhang, Jing, et al. "Rapid Removal of Organic Pollutants By Activation Sulfite With Ferrate." Chemosphere, vol. 186, 2017, pp. 576-579.
Zhang J, Zhu L, Shi Z, et al. Rapid removal of organic pollutants by activation sulfite with ferrate. Chemosphere. 2017;186:576-579.
Zhang, J., Zhu, L., Shi, Z., & Gao, Y. (2017). Rapid removal of organic pollutants by activation sulfite with ferrate. Chemosphere, 186, 576-579. https://doi.org/10.1016/j.chemosphere.2017.07.102
Zhang J, et al. Rapid Removal of Organic Pollutants By Activation Sulfite With Ferrate. Chemosphere. 2017;186:576-579. PubMed PMID: 28810226.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Rapid removal of organic pollutants by activation sulfite with ferrate. AU - Zhang,Jing, AU - Zhu,Liang, AU - Shi,Zhenyu, AU - Gao,Ying, Y1 - 2017/07/19/ PY - 2017/04/12/received PY - 2017/07/04/revised PY - 2017/07/18/accepted PY - 2017/8/16/pubmed PY - 2017/12/20/medline PY - 2017/8/16/entrez KW - Dye KW - Fe(VI) KW - Hydroxyl radical KW - PPCPs KW - Sulfate radical KW - Sulfite radical SP - 576 EP - 579 JF - Chemosphere JO - Chemosphere VL - 186 N2 - With the addition of sulfite, almost complete removal of seven out of eight tested contaminants, i.e. benzotriazole, phenol, ciprofloxacin, methyl blue, rhodamine B, methyl orange and sulfamethoxazole, was observed in 30 s except for sulfamethoxazole at pH 9.0, while Fe(VI) alone only resulted in less than 6% removal. In this study, the mechanism of sulfite/Fe(VI) process was explored for the first time. Firstly, sulfite attacks Fe(VI) via a 1-e- transfer forming the primary sulfite radical (SO3-), then SO3- reacts rapidly with oxygen in a diffusion controlled rate to form a much more reactive peroxyl radical SO5-, which further reacts with HSO3- and produces SO4-. All the signals of sulfite, sulfate and hydroxyl radicals were observed in the electron spin resonance (ESR) analysis. The DMPO and alcohol quenching experiments confirmed that sulfite/Fe(VI) process involves radicals as the plausible reactive species for decomposition of organic pollutants, and SO4·-/·OH instead of SO3-/SO5- are the major reactive oxygen species. Since oxygen participates in the formation of the secondary radicals, i.e. SO5-, SO4- and ·OH, the sulfite/Fe(VI) process open to air displayed better performance than that purged with nitrogen. Compared with previous sulfite/Cr(VI) and sulfite/Mn(VII) processes, which are only effective under acidic conditions, sulfite/Fe(VI) process provides an alternative under neutral and alkaline conditions. The extraordinarily fast oxidation of pollutants in sulfite/Fe(VI) process suggests that activation of sulfite by Fe(VI) might lead to a new class of advanced oxidation processes (AOPs) in water treatment. SN - 1879-1298 UR - https://www.unboundmedicine.com/medline/citation/28810226/Rapid_removal_of_organic_pollutants_by_activation_sulfite_with_ferrate_ L2 - https://linkinghub.elsevier.com/retrieve/pii/S0045-6535(17)31154-2 DB - PRIME DP - Unbound Medicine ER -