Chromium-zinc ferrite nanocomposites for the catalytic abatement of toxic environmental pollutants under ambient conditions

Nair, Divya S.; Kurian, Manju

doi:10.1016/j.jhazmat.2017.11.045

Cited by 32 publications

(9 citation statements)

References 40 publications

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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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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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“…Table 1 demonstrates the influence of Cr concentration on the lattice constants of CrZF samples; the results were consistent with Vegard's law. 21,30) The average crystallite size (D XRD ) values for the powder samples were determined using the Debye-Scherrer formula:…”

Section: Xrd Analysismentioning

confidence: 99%

“…This indicated that the Cr 3+ ions replaced a proportional amount of Fe 3+ ions in the octahedral sites, resulting in a reduction in the length of the metal-oxygen bond, which was reflected by an increase in the broadening of the absorption band, as presented in Table 2. 21)…”

Section: Ft-ir Analysismentioning

confidence: 99%

“…Among cubic spinel ferrite materials, zinc ferrites are unique and technologically important, and find a variety of applications in water splitting, biomedicine, photocatalysts, transformer cores, microwave technology, magnetic recording media, and gas sensors. [9][10][11][12][13] The general formula of the cubic spinel structure is AB 2 O 4 , where "A" is a bivalent metal ion and "B" is a trivalent metal ion. The spinel ferrite crystal structure consists of a cubic closed arrangement of oxygen ions with 8 tetrahedral (A-site) and 16 octahedral (B-site) interstitial sites in the unit cell.…”

Section: Introductionmentioning

confidence: 99%

“…Chromium zinc ferrites are extensively studied soft magnetic materials and they can be easily obtained via the introduction of Cr 3+ ions into the unit cell of zinc ferrite because their size is analogous to that of Fe 3+ ions. 9,[18][19][20][21] Currently, nanoparticles of spinel ferrite are synthesized by different techniques such as chemical co-precipitation, 22,23) microwave combustion, 24,25) hydrothermal, 26) sol-gel, 27) and ceramic 28) methods.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Structural and Magnetic Properties of Cr-Zn Nanoferrites Synthesized by Chemical Co-Precipitation Method

Powar¹,

Phadtare²,

Pathak³

et al. 2019

J. Korean Ceram. Soc

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Chromium-doped zinc ferrite nanoparticles with the general formula Cr y ZnFe 2-y O 4 (y = 0, 0.025, 0.05, 0.075, and 0.1) were synthesized by a surfactant-assisted chemical co-precipitation route using metal nitrate salt precursors. The phase purity and structural parameters were determined by powder X-ray diffraction. The concentration of Cr 3+ doped into ZnFe 2 O 4 (ZF) noticeably affected the crystallite size, which was in the range of 22 nm to 36 nm, and all samples showed a single cubic spinel structure without any secondary phase or impurities. The lattice parameter, X-ray density, and skeletal density increased with an increase in the Cr-doping concentration; on the other hand, a decreasing trend was observed for the particle size and porosity. The influence of Cr 3+ substitution on ZF magnetic properties were studied under an applied field of 15 kOe. The overall results revealed that the incorporation of a small amount of Cr dopant changed the structural, electrical, and magnetic properties of ZF.

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Spinel Nanoferrites: A Versatile Platform for Environmental Remediation

Singh

Bansal

Singhal

2021

Topics in Mining, Metallurgy and Materials Engineering

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Chromium-zinc ferrite nanocomposites for the catalytic abatement of toxic environmental pollutants under ambient conditions

Cited by 32 publications

References 40 publications

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

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

Structural and Magnetic Properties of Cr-Zn Nanoferrites Synthesized by Chemical Co-Precipitation Method

Spinel Nanoferrites: A Versatile Platform for Environmental Remediation

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