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Issue 13, 2018
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Synthesis of different crystallographic FeOOH catalysts for peroxymonosulfate activation towards organic matter degradation

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Abstract

In this study, different crystalline structures of FeOOH have been prepared. α-FeOOH was synthesized through a hydrothermal method, whereas β-FeOOH was synthesized via a direct hydrolysis method. Moreover, γ- and δ-FeOOH were prepared by precipitation methods through slow and quick oxidation, respectively. On this basis, their crystal structure, morphology, and surface area were measured. Then, all the synthesized materials were applied to activate peroxymonosulfate (PMS) to generate sulfate radicals (SO4˙) for acid orange 7(AO7) degradation. Compared with α-FeOOH, β-FeOOH, and γ-FeOOH, δ-FeOOH showed more efficient decolorization of AO7 in the catalytic system because of its abundant surface area and crystalline structure. The effects of several parameters in the δ-FeOOH/PMS/AO7 system were investigated. The results show that the initial pH, which is related to the features of surface hydroxyl groups, is the decisive factor, and excellent catalytic activity is maintained in the pH range 5–8. The increase of catalyst dosage and appropriate increase of PMS concentration contributed to promote the degradation effect. However, self-quenching was observed in a high PMS concentration system. Moreover, δ-FeOOH was stable after six consecutive cycles, and the leaching of iron ions was negligible. According to the quenching test and electron spin resonance analysis, both SO4˙ and ˙OH were the dominant radicals for AO7 degradation.

Graphical abstract: Synthesis of different crystallographic FeOOH catalysts for peroxymonosulfate activation towards organic matter degradation

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Publication details

The article was received on 20 Nov 2017, accepted on 31 Jan 2018 and first published on 14 Feb 2018


Article type: Paper
DOI: 10.1039/C7RA12615H
RSC Adv., 2018,8, 7269-7279
  • Open access: Creative Commons BY license
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    Synthesis of different crystallographic FeOOH catalysts for peroxymonosulfate activation towards organic matter degradation

    J. Fan, Z. Zhao, Z. Ding and J. Liu, RSC Adv., 2018, 8, 7269
    DOI: 10.1039/C7RA12615H

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