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Iron–cobalt mixed oxide nanocatalysts: Heterogeneous peroxymonosulfate activation, cobalt leaching, and ferromagnetic properties for environmental applications

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Abstract.
Sulfate radical-based advanced oxidation technologies (SR-AOTs) are attracting considerable attention
due to the high oxidizing ability of SRs to degrade organic pollutants in aqueous environments. This study
was carried out to respond to current concerns and challenges in SR-AOTs, including (i) need of
heterogeneous activation of sulfate salts using transition metal oxides, (ii) nanoscaling of the metal oxide
catalysts for high catalytic activity and promising properties with respect to leaching, and (iii) easy
removal and recovery of the catalytic materials after their applications for water and wastewater
treatments. In this study, we report a novel approach of using Fe–Co mixed oxide nanocatalysts for the
heterogeneous activation of peroxymonosulfate (PMS) to generate SRs targeting the decomposition of
2,4-dichlorophenol, and especially focus on some synthesis parameters such as calcination temperature,
Fe/Co contents, and TiO2 support. The physicochemical properties of the catalysts were investigated
using porosimetry, XRD, HR-TEM, H2-TPR, and XPS. Ferromagnetic CoFe2O4 composites formed by
thermal oxidation of a mixed phase of Fe and Co exhibited significant implications for the efficient and
environmentally friendly activation of PMS, including (i) the cobalt species in CoFe2O4 are of Co(II), unlike
Co3O4 showing some detrimental effects of Co(III) on the PMS activation, (ii) CoFe2O4 possesses
suppressed Co leaching properties due to strong Fe–Co interactions (i.e. Fe–Co linkages), and (iii) Fe–Co
catalysts in form of CoFe2O4 are easier to recover due to the unique ferromagnetic nature of CoFe2O4. In
addition, the presence of Fe was found to be beneficial for enriching hydroxyl group content on the Fe–Co
catalyst surface, which is believed to facilitate the formation of Co(II)-OH complexes that are vital for
heterogeneous PMS activation.

Keywords: 2,4-Dichlorophenol, Advanced oxidation processes (AOPs), Advanced oxidation technologies (AOTs), Cobalt, Fe–Co, Ferromagnetic properties, Heterogeneous reaction, Iron, Iron–cobalt, Leaching, Mixed oxide, Nanoparticles, Oxone, Peroxymonosulfate, Support materials, Sulfate radicals, Titanium dioxide, Titania, TiO2, Water treatment, Water purification

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Informasi Detail

Judul Seri

Applied Catalysis B: Environmental

No. Panggil

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Penerbit

London : Elsevier B.V.., 2009

Deskripsi Fisik

Applied Catalysis B: Environmental 88 (2009) 462–469

Bahasa

English

ISBN/ISSN

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Klasifikasi

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Tipe Isi

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Tipe Media

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Tipe Pembawa

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Edisi

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Subjek

KIMIA

Info Detail Spesifik

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Pernyataan Tanggungjawab

agus

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