Catalytic wastewater treatment: Oxidation and reduction processes. Recent studies on chlorophenols

Descorme, C.

doi:10.1016/j.cattod.2017.03.039

Cited by 78 publications

(42 citation statements)

References 51 publications

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“…More specifically, heterogeneous catalysis assisted by irradiation of ultraviolet and visible light as an advanced process of oxidation of recalcitrant and/or persistent organic molecules has become of interest as a potential application of LDHs [15,16]. Several advanced oxidation processes, such as O 3 /Ultraviolet (UV), O 3 /H 2 O 2 , UV/H 2 O 2 , Fenton, UV/Fenton, and UV/TiO 2 , have been applied in wastewater as a treatment to mineralize many organic chemicals [17][18][19][20][21]. Within the persistent molecules that exist, interest in their degradation tends to increase by their toxicity and damage to the environment, as is the case for chlorophenols.…”

Section: Introductionmentioning

confidence: 99%

Photocatalytic Degradation of 2,4,6-Trichlorophenol by MgO–MgFe2O4 Derived from Layered Double Hydroxide Structures

et al. 2019

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In recent years, the search for solutions for the treatment of water pollution by toxic compounds such as phenols and chlorophenols has been increasing. Phenols and their derivatives are widely used in the manufacture of pesticides, insecticides, paper, and wood preservers, among other things. Chlorophenols are partially biodegradable but not directly photodegradable by sunlight and are extremely toxic—especially 2,4,6-trichlorophenol, which is considered to be potentially carcinogenic. As a viable proposal to be applied in the treatment of water contaminated with 2,4,6-trichlorophenol, this paper presents an application study of the thermally activated Mg/Fe layered double hydroxides as photocatalysts for the mineralization of this contaminant. Activated Mg/Fe layered double hydroxides were characterized by X-ray diffraction, thermal analysis, N2 physisorption, and scanning electron microscopy with X-ray dispersive energy. The results of the photocatalytic degradation of 2,4,6-trichlorophenol in aqueous solution showed good photocatalytic activity, with an efficiency of degradation of up to 93% and mineralization of 82%; degradation values which are higher than that of TiO2-P25, which only reached 18% degradation. The degradation capacity is attributed to the structure of the MgO–MgFe2O4 oxides derived from double laminate hydroxide Mg/Fe. A path of degradation based on a mechanism of superoxide and hollow radicals is proposed.

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Section: Introductionmentioning

confidence: 99%

Photocatalytic Degradation of 2,4,6-Trichlorophenol by MgO–MgFe2O4 Derived from Layered Double Hydroxide Structures

et al. 2019

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“…As a result, it could be found in water and soil, and aggravate environmental pollution problems, especially the water pollution problems. However, it is toxic and hard to be degraded from the water by conventional treatment processes of wastewater treatment plants …”

Section: Introductionmentioning

confidence: 99%

Elimination of 4‐chlorophenol in aqueous solution by the Novel Pd/MIL‐101(Cr)‐Hydrogen‐Accelerated catalytic fenton system

Liu

Fan

Liu

et al. 2019

Applied Organom Chemis

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Excessive consumption of Fe (II) and massive generation of sludge containing Fe (III) from classic Fenton process remains a major obstacle for its poor recycling of Fe (III) to Fe (II). Therefore, the MHACF‐MIL‐101(Cr) system, by introducing H2, Pd0 and MIL‐101(Cr) into Fenton reaction system, was developed at normal temperature and pressure. In this system, the reduction of FeIII back to FeII by solid catalyst Pd/MIL‐101(Cr) for the storage and activation of H2, was accelerated significantly by above 10‐fold and 5‐fold controlled with the H2‐MIL‐101(Cr) system and H2‐Pd0 system, respectively. However, the concentration of Fe (II) generated by the reduction of Fe (III) could not be detected with the only input of H2 and without the addition of MOFs material. In addition, the apparent consumption of Fe (II) in MHACF‐MIL‐101(Cr) system was half of that in classical Fenton system, while more Fe (II) might be reused infinitely in fact. Accordingly, only trace amount of Fe (II) vs H2O2 concentration was needed and hydroxyl radicals through the detection of para‐hydroxybenzoic acid (p‐HBA) as the oxidative product of benzoic acid (BA) by·OH could be continuously generated for the effective degradation of 4‐chlorophenol(4‐CP). The effects of initial pH, concentration of 4‐CP, dosage of Fe2+, H2O2 and Pd/MIL‐101(Cr) catalyst, Pd content and H2 flow were investigated, combined with systematic controlled experiments. Moreover, the robustness and morphology change of Pd/MIL‐101(Cr) were thoroughly analyzed. This study enables better understanding of the H2‐mediated Fenton reaction enhanced by Pd/MIL‐101(Cr) and thus, will shed new light on how to accelerate Fe (III)/Fe (II) redox cycle and develop more efficient Fenton system.

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“…These yolk/shell Pd@Fe 3 O 4 @MOFs composites were used in Fenton‐like reaction. This reaction has been in the center of attention because of the widespread use in the remediation of contaminated soil, sediment, and water . Different catalysts based on Fe 3 O 4 have been developed to decline diverse organic pollutants, which had been produced in this reaction, such as phenols,[56c], dyes, and antibiotics .…”

Section: Different Applications Of Magnetic Framework Compositesmentioning

confidence: 99%

“…This reaction has been in the center of attention because of the widespread use in the remediation of contaminated soil, sediment, and water . Different catalysts based on Fe 3 O 4 have been developed to decline diverse organic pollutants, which had been produced in this reaction, such as phenols,[56c], dyes, and antibiotics . Furthermore, some studies have been carried out on the role of iron oxides components which exhibited that these particles could transfer electrons to Pd NPs, which could enhance the rate of the catalytic property in Pd NPs and their stability in acid solution .…”

Section: Different Applications Of Magnetic Framework Compositesmentioning

confidence: 99%

Fe₃O₄@MOF Magnetic Nanocomposites: Synthesis and Applications

Aghayi‐Anaraki

Safarifard

2020

Eur J Inorg Chem

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In this review, we gather a great deal of information about magnetic nanocomposites, which are made from the combination of Fe 3 O 4 magnetic nanoparticles (MNPs) and metal-organic frameworks (MOFs). Due to the high saturation magnetization, biocompatibility, low toxicity, stability, and costeffectiveness, MNPs have attracted a lot of interest in recent years. Furthermore, MOFs, which are porous materials, formed by the connection between organic linkers and metal ions. The combination of MNPs and MOFs results in the formation of magnetic framework composites (MFCs). The information about the MFCs is classified according to their applications and we

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Catalytic wastewater treatment: Oxidation and reduction processes. Recent studies on chlorophenols

Cited by 78 publications

References 51 publications

Photocatalytic Degradation of 2,4,6-Trichlorophenol by MgO–MgFe2O4 Derived from Layered Double Hydroxide Structures

Photocatalytic Degradation of 2,4,6-Trichlorophenol by MgO–MgFe2O4 Derived from Layered Double Hydroxide Structures

Elimination of 4‐chlorophenol in aqueous solution by the Novel Pd/MIL‐101(Cr)‐Hydrogen‐Accelerated catalytic fenton system

Fe₃O₄@MOF Magnetic Nanocomposites: Synthesis and Applications

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Catalytic wastewater treatment: Oxidation and reduction processes. Recent studies on chlorophenols

Cited by 78 publications

References 51 publications

Photocatalytic Degradation of 2,4,6-Trichlorophenol by MgO–MgFe2O4 Derived from Layered Double Hydroxide Structures

Photocatalytic Degradation of 2,4,6-Trichlorophenol by MgO–MgFe2O4 Derived from Layered Double Hydroxide Structures

Elimination of 4‐chlorophenol in aqueous solution by the Novel Pd/MIL‐101(Cr)‐Hydrogen‐Accelerated catalytic fenton system

Fe3O4@MOF Magnetic Nanocomposites: Synthesis and Applications

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Fe₃O₄@MOF Magnetic Nanocomposites: Synthesis and Applications