Generation of sulfate radical through heterogeneous catalysis for organic contaminants removal: Current development, challenges and prospects

Oh, Wen−Da; Dong, Zhili; Lim, Teik−Thye

doi:10.1016/j.apcatb.2016.04.003

Cited by 2,240 publications

(567 citation statements)

References 296 publications

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“…). Previous reports explain the activation of persulfate by biochar in two ways: surface functional groups (as a form of persistent free radical) and delocalized electrons in graphitic regions in biochar …”

Section: Resultsmentioning

confidence: 99%

“…Biochar and graphite preferably produce hydroxyl radicals because the OO bond of persulfate is first activated and weakened on the active sites of the carbonaceous materials, followed by directly oxidizing the adsorbed water to generate ·OH (Fig. ) . The possible products of phenol oxidation by Fe(0)/biochar‐activated persulfate are summarized in Table S2.…”

Section: Resultsmentioning

confidence: 99%

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Biochar‐mediated oxidation of phenol by persulfate activated with zero‐valent iron

Nguyen

2019

J of Chemical Tech & Biotech

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BACKGROUND Biochar, a by‐product of the pyrolysis of biomass, was used to investigate activation of persulfate in the presence of zero‐valent iron, Fe(0), for the purposes of phenol degradation. Relevant factors of pH, persulfate concentration, and type of black carbon (biochar, activated carbon, and graphite) were examined. RESULTS Maximal removal of phenol was obtained at an initial pH of 2 in Fe(0)–biochar–persulfate systems. At a pH of 7, 89% of the phenol was degraded, with 2.60 mmol L−1 of persulfate, 300 mg of Fe(0), and 100 mg of biochar. Under optimal conditions, more than 95% of phenol degraded after 330 min. Electron paramagnetic resonance analysis showed that sulfate radical (SO4−·) and hydroxyl radical (·OH) were involved in phenol degradation. A graphitic structure arising from a sp2 covalent carbon network and oxygen‐containing functional groups on biochar were responsible for enhancement of phenol degradation. CONCLUSIONS Our study suggests that biochar‐mediated oxidation by persulfate with Fe(0) may be an effective treatment technology for removal of phenol from natural and engineered aquatic systems. © 2019 Society of Chemical Industry

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Biochar‐mediated oxidation of phenol by persulfate activated with zero‐valent iron

Nguyen

2019

J of Chemical Tech & Biotech

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“…SO 4 −• was normally produced by the activation of peroxymonosulfate (PMS) or persulfate (PS) via a variety of methods such as heat, ultrasound, ultraviolet irradiation, microwave, alkali and transition metal catalysis . Among various activation technologies, different transition metals were extensively studied for their excellent performance . Iron‐based materials were non‐toxic, safe, cost‐effective and eco‐friendly and were used to activate PS .…”

Section: Introductionmentioning

confidence: 99%

“…For example, zero-valent iron was easily agglomerated and rapidly deposited 20,21 and Fe 2 O 3 was less active in generating SO 4 −• because Fe 3+ could not directly activate PS to produce SO 4 −• . 11,18 Therefore several methods have been adopted to address this problem, such as doping with other transition metals 22 and developing new multi-metal catalysts. 23 MnFe 2 O 4 was one kind of mixed metal catalyst with high activity and high recovery rate.…”

Section: Introductionmentioning

confidence: 99%

Efficient degradation of Acid Orange 7 by persulfate activated with a novel developed carbon‐based MnFe₂O₄ composite catalyst

Liu

et al. 2019

J of Chemical Tech & Biotech

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BACKGROUND A novel carbon‐based modified MnFe2O4 catalyst was first developed to produce sulfate radicals (SO4−•) by activation of persulfate (PS). The catalyst was fabricated with a mixture of MnFe2O4 nanoparticles and chitosan (which could form a large amount of carbon‐based biomass after pyrolysis) annealed at 600 °C and was referred to as CM‐600. RESULTS The microstructure of the composite catalyst CM‐600 showed that MnFe2O4 was supported on the surface of carbon‐based sheets. After modification by pyrolysis, the specific surface area of MnFe2O4 enlarged significantly and thus the contact area between catalyst and PS increased. X‐ray diffraction, Fourier transform infrared spectroscopy, Raman spectroscopy and X‐ray photoelectron spectroscopy were used to characterize the components of CM‐600. In comparison with the MnFe2O4/PS system, the activation of PS by CM‐600 was enhanced prominently, while 99.0% Acid Orange 7 (AO7) removal was achieved after reacting for 30 min. Investigations of influencing factors indicated the optimal treatment parameters. The two reactive species in the degradation process, namely free radicals (SO4−• and hydroxyl radicals (•OH)) and non‐radicals (singlet oxygen, 1O2), were confirmed by quenching tests and electron spin resonance spectroscopy. The corresponding degradation mechanism was proposed and SO4−• was generated primarily via the activation of PS by MnII and FeII. CONCLUSION The research demonstrated that the composite catalyst CM‐600 improved the property of MnFe2O4 for catalyzing PS and thus enlarged the practical application of SO4−• oxidation technology in pollutant degradation in aqueous environments. © 2019 Society of Chemical Industry

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“…In last decade, the application of peroxymonosulfate (PMS) in degradation of environmental pollutants has received great attention. PMS is an asymmetrical oxidant which is activated by transition metals, UV irradiation, ultrasound, heat, and carbon-based catalyst [17,18]. PMS can generate sulfate and hydroxyl radicals through activation by conduction electron i.e.…”

Section: Introductionmentioning

confidence: 99%

Photocatalytic degradation of food dye by Fe3O4–TiO2 nanoparticles in presence of peroxymonosulfate: The effect of UV sources

Zazouli

Ghanbari

Yousefi

et al. 2017

Journal of Environmental Chemical Engineering

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Generation of sulfate radical through heterogeneous catalysis for organic contaminants removal: Current development, challenges and prospects

Cited by 2,240 publications

References 296 publications

Biochar‐mediated oxidation of phenol by persulfate activated with zero‐valent iron

Biochar‐mediated oxidation of phenol by persulfate activated with zero‐valent iron

Efficient degradation of Acid Orange 7 by persulfate activated with a novel developed carbon‐based MnFe₂O₄ composite catalyst

Photocatalytic degradation of food dye by Fe3O4–TiO2 nanoparticles in presence of peroxymonosulfate: The effect of UV sources

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Generation of sulfate radical through heterogeneous catalysis for organic contaminants removal: Current development, challenges and prospects

Cited by 2,240 publications

References 296 publications

Biochar‐mediated oxidation of phenol by persulfate activated with zero‐valent iron

Biochar‐mediated oxidation of phenol by persulfate activated with zero‐valent iron

Efficient degradation of Acid Orange 7 by persulfate activated with a novel developed carbon‐based MnFe2O4 composite catalyst

Photocatalytic degradation of food dye by Fe3O4–TiO2 nanoparticles in presence of peroxymonosulfate: The effect of UV sources

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Efficient degradation of Acid Orange 7 by persulfate activated with a novel developed carbon‐based MnFe₂O₄ composite catalyst