New insights into the role of organic chelating agents in Fe(II) activated persulfate processes

Han, Deguang; Wan, Jinquan; Ma, Yuanyuan; Wang, Yan; Liu, Ying; Li, Dongya; Guan, Zeyu

doi:10.1016/j.cej.2015.01.106

Cited by 189 publications

(30 citation statements)

References 43 publications

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“…At neutral and alkaline pH, Fe 3+ will precipitate as iron oxide resulting in reduced activity. In order to regulate and control the concentration of soluble Fe 2+ in the solution, various complexing agents such as ethylene diamine tetraacetic acid (EDTA), ethylene diamine disuccinic acid (EDDS), oxalic acid, and citric acid have been used to chelate ferrous iron [11, 12]. Although the addition of a complexing agent can successfully complex iron, the complexing agent itself would react with SO 4 − · [13], which results in scavenging a certain fraction of the free radicals [14].…”

Section: Introductionmentioning

confidence: 99%

Activation performance and mechanism of a novel heterogeneous persulfate catalyst: metal–organic framework MIL-53(Fe) with Fe^II/Fe^III mixed-valence coordinatively unsaturated iron center

Wan

et al. 2017

Catal. Sci. Technol.

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136

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In this work, a novel effective heterogeneous catalyst metal-organic framework MIL-53(Fe) has been synthesized for the purpose of activating persulfate (PS). Catalytic performance of MIL-53(Fe) activated under different vacuum conditions was investigated; stability and reusability of the catalyst were evaluated, and the activation mechanism was also investigated. The results indicated that vacuum activation could cause variation of the FeII/FeIII relative amount ratio of the catalyst, and thus would change the catalytic activities of MIL-53(Fe), because FeII or FeIII CUS (coordinative unsaturated metal site) are alternative active sites. It was found that MIL-53(Fe)-2 exhibits good performance for PS activation and could be used for multiple cycles. A removal rate of 98% for Orange G was obtained within 120min (95.7% mineralization efficiency), and 94.3% was attained in the fifth cycle. The mechanism of the activation of PS by MIL-53(Fe) was also suggested, which involves a predominant heterogeneous reaction and an auxiliary homogeneous reaction. The findings of this study provide new insight into the application of the reactive metal-organic frameworks in activating persulfate for the degradation of environmental contaminants.

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Section: Introductionmentioning

confidence: 99%

Activation performance and mechanism of a novel heterogeneous persulfate catalyst: metal–organic framework MIL-53(Fe) with Fe^II/Fe^III mixed-valence coordinatively unsaturated iron center

Wan

et al. 2017

Catal. Sci. Technol.

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136

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“…Complete removal of MB 9 was achieved after 30 min. These results suggest that SO • and •OH radicals were generated, causing MB 9 degradation in this system [34]. Figure 1a also shows the two steps involved in MB 9 degradation: (i) fast-stage degradation, which occurred within the initial 15 min because of the rapid production of SO • via S2O8 2− dissociation [30] and (ii) slow-stage degradation, which was related to the low concentration of the radicals.…”

Section: Comparative Studies On Mb 9 Degradation Efficiencymentioning

confidence: 84%

Efficient Degradation of Mordant Blue 9 Using the Fenton-Activated Persulfate System

Pervez

Telegin

Cai

et al. 2019

Water

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In this study, a Fenton-activated persulfate (Fe 2+ /PS) system was introduced for the efficient degradation of Mordant Blue 9 (MB 9) as a textile dye in an aqueous solution. Results showed that the degradation of MB 9 was markedly influenced by operational parameters, such as initial pH, PS concentration, Fe 2+ concentration, and initial dye concentration. Optimal reaction conditions were then determined. Inorganic anions, such as Cl − and HCO 3 − , enhanced the degradation efficiency of MB 9 under optimal conditions. Addition of HCO 3 − reduced the degradation performance of MB 9, whereas the addition of Cl − increased the degradation percentage of MB 9. In addition, quenching experiments were conducted using methanol and tert-butyl alcohol as scavengers, and methanol was identified as an effective scavenger. Thus, the degradation of MB 9 was attributed to SO •− 4 and • OH radicals. The degradation and mineralization efficiency of MB 9 was significantly reduced using the conventional Fenton process i.e., Fe 2+ / hydrogen peroxide (HP) because of the formation of a Fe complex during degradation. Meanwhile, the Fe 2+ /persulfate (PS) system improved the degradation and mineralization performance.

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“…Among the activators, Fe 2+ has been commonly selected due to its great practical application's advantages, such as high efficiency, large abundance, low cost and environmental friendly nature [18,19]. Изв.…”

Section: Introductionmentioning

confidence: 99%

Degradation of Acid Orange 7 in Aqueous Solution Under Presence of Iron(iii), Persulphate and Visible Light Irradiation

Zhong

Zhao

et al. 2017

IVUZKKT

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New insights into the role of organic chelating agents in Fe(II) activated persulfate processes

Cited by 189 publications

References 43 publications

Activation performance and mechanism of a novel heterogeneous persulfate catalyst: metal–organic framework MIL-53(Fe) with Fe^II/Fe^III mixed-valence coordinatively unsaturated iron center

Activation performance and mechanism of a novel heterogeneous persulfate catalyst: metal–organic framework MIL-53(Fe) with Fe^II/Fe^III mixed-valence coordinatively unsaturated iron center

Efficient Degradation of Mordant Blue 9 Using the Fenton-Activated Persulfate System

Degradation of Acid Orange 7 in Aqueous Solution Under Presence of Iron(iii), Persulphate and Visible Light Irradiation

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New insights into the role of organic chelating agents in Fe(II) activated persulfate processes

Cited by 189 publications

References 43 publications

Activation performance and mechanism of a novel heterogeneous persulfate catalyst: metal–organic framework MIL-53(Fe) with FeII/FeIII mixed-valence coordinatively unsaturated iron center

Activation performance and mechanism of a novel heterogeneous persulfate catalyst: metal–organic framework MIL-53(Fe) with FeII/FeIII mixed-valence coordinatively unsaturated iron center

Efficient Degradation of Mordant Blue 9 Using the Fenton-Activated Persulfate System

Degradation of Acid Orange 7 in Aqueous Solution Under Presence of Iron(iii), Persulphate and Visible Light Irradiation

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Product

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Activation performance and mechanism of a novel heterogeneous persulfate catalyst: metal–organic framework MIL-53(Fe) with Fe^II/Fe^III mixed-valence coordinatively unsaturated iron center

Activation performance and mechanism of a novel heterogeneous persulfate catalyst: metal–organic framework MIL-53(Fe) with Fe^II/Fe^III mixed-valence coordinatively unsaturated iron center