Copper–cobalt synergy in Cu1−xCoxFe2O4spinel ferrite as a highly efficient and regioselective nanocatalyst for the synthesis of 2,4-dinitrotoluene

Fareghi‐Alamdari, Reza; Zandi, Farzad; Keshavarz, Mohammad Hossein

doi:10.1039/c5ra11338e

Cited by 24 publications

(6 citation statements)

References 48 publications

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“…In NiF and CuF photocatalysts, Fe 2 O 3 was confirmed as an impurity that was absent in CoF and ZnF. The crystallite size of a ferrite nanoparticle was calculated using the Debye-Scherrer equation: D = 0.9λ/(β Cosθ), where D is the crystallite size, λ is the wavelength of Cu Kα radiation, β is the full width at half maximum of the diffraction peak, and θ is the Bragg angle 21 . The crystallite size for CoF, NiF, CuF, and ZnF was found to be 34 nm, 27 nm, 16 nm, and 36 nm, respectively (Supplementary Table 2).…”

Section: Resultsmentioning

confidence: 99%

“…The high-intensity band in the range of 750-500 cm −1 (v 1 ) was attributed to the intrinsic stretching vibrations of the tetrahedral site-occupied metal-oxygen bond [M 2+ tetra ↔ O]. The low-intensity band 450-400 cm −1 (v 2 ) was due to the octahedral Fe 3+ -oxygen stretching vibration 21 . The broad band centered at 3427 cm −1 and a low-intensity band centered at 1630 cm −1 were assigned to the stretching and bending mode of O-H bonds of physically adsorbed water molecules.…”

Section: Resultsmentioning

confidence: 99%

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Photocatalytic Degradation of Organic Pollutants over MFe2O4 (M = Co, Ni, Cu, Zn) Nanoparticles at Neutral pH

Gupta

Ghaffari

Kim

et al. 2020

Sci Rep

161

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in this study, we report a surfactant-mediated synthesis of ferrites (Mfe 2 o 4 : M = co, ni, cu, Zn) using the co-precipitation-oxidation method. The band gap calculated from UV-Visible diffuse reflectance spectra were found in the range of 1.11-1.81 eV. These ferrite nanocatalysts were studied for the photocatalytic degradation of multiple organic dyes in a 32 W UV-C/H 2 o 2 system. All the four ferrites showed an excellent dye degradation rate in the range of 2.065-2.417 min −1 at neutral pH. in the optimized condition, NiF was found to degrade 89%, 92%, 93%, and 78% of methylene blue, methyl orange, bromo green, and methyl red, respectively within 1 min of UV-irradiation. A 40% TOC removal was recorded after 5 min of degradation reaction, which increased to 60% after 50 min. Mechanism elucidated by scavenger studies and fluorescence spectroscopy revealed that • oH and holes were the primary reactive radicals responsible for the degradation process. ferrite photocatalysts showed an insignificant performance loss in seven consecutive cycles. The photocatalyst was found efficient in the presence of a high concentration of salts. thus, it was concluded that these photocatalysts are highly suitable for the remediation of dye-contaminated wastewater. The ever-increasing population, coupled with rapid urbanization and industrialization, have deteriorated the quality of life. Excessive contamination of water bodies could be a severe threat to both human beings and other life forms. Organic dyes are considered as one of the major pollutants discharged into the environment by textile, printing, food, and leather industries 1. Though a large segment of these synthetic dyes is non-toxic or less toxic, their presence in water increases the oxygen demand, which in turn affects aquatic animals 2. Among the dyes consumed in industries, up to 70% belong to azo dye family (those with azo-functional group "-N = N-"). Azo dyes have genotoxic, mutagenic, and carcinogenic effects on living beings 3. Some of the azo dyes are known to be carcinogenic in the non-cleaved state, and for many of the azo dyes, their cleaved products such as benzidine are known to induce tumors 4. Conventional biological, chemical, and physical methods like adsorption 5,6 , chemical precipitation 7 , and microbial degradation 8 have been established for the remediation of dye-contaminated wastewater. The practical application of these processes suffers due to high operational cost, sludge production, or formation of secondary pollutants. For a complete or partial degradation of organic dyes (into non-toxic byproducts), degradation by adopting the photocatalytic process is one of the viable options. In recent years, advanced oxidation processes based on the generation of highly reactive hydroxyl radicals have gained momentum for the degradation of toxic organic pollutants 9. Though the Fenton process is easier to operate, it suffers badly due to a slow regeneration of Fe 2+ ions 10. Thus, the ultraviolet radiation or electrochemical method is generally cou...

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Photocatalytic Degradation of Organic Pollutants over MFe2O4 (M = Co, Ni, Cu, Zn) Nanoparticles at Neutral pH

Gupta

Ghaffari

Kim

et al. 2020

Sci Rep

161

View full text Add to dashboard Cite

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“…For spinel ferrites, the band appearing at the higher wave number (500-600 cm À1 ) is usually assigned to tetrahedral coordination while that at the lower wave number (385-450 cm À1 ) is oen ascribed to octahedral coordination. 46,47 Thus, it can be concluded that the products, S1P to S5P, correspond to the cobalt ferrite spinel. Avazpour et al 45 have obtained similar results with the absorption bands at 540 cm À1 and 331 cm À1 corresponding, respectively, to the tetrahedral and octahedral groups in cobalt ferrite.…”

Section: Resultsmentioning

confidence: 97%

Structural characterization and magnetic properties of undoped and copper-doped cobalt ferrite nanoparticles prepared by the octanoate coprecipitation route at very low dopant concentrations

et al. 2018

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“…The release profile of 9R from NPs was determined through a quantitative proton NMR experiment. 9R@ker was placed into dialysis bags, immersed in PBS at (i) pH = 7.4 (physiological conditions) and at (ii) pH = 5.5 in order to mimic the typical lysosomes acidic conditions (Figure C). ,, …”

Section: Resultsmentioning

confidence: 99%

Unprecedented Behavior of (9R)-9-Hydroxystearic Acid-Loaded Keratin Nanoparticles on Cancer Cell Cycle

et al. 2019

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Histone deacetylases, HDACs, have been demonstrated to play a critical role in epigenetic signaling and were found to be overexpressed in several type of cancers; therefore, they represent valuable targets for anticancer therapy. 9-Hydroxystearic acid has been shown to bind the catalytic site of HDAC1, inducing G0/G1 phase cell cycle arrest and activation of the p21WAF1 gene, thus promoting cell growth inhibition and differentiation in many cancer cells. Despite the (R) enantiomer of 9-hydroxystearic acid (9R) displaying a promising in vitro growth-inhibitory effect on the HT29 cell line, its scarce water solubility and micromolar activity require novel solutions for improving its efficacy and bioavailability. In this work, we describe the synthesis and in vitro biological profiling of 9R keratin nanoparticles (9R@ker) obtained through an in-water drug-induced aggregation process. The anticancer activity of 9R@ker was investigated in the HT29 cell line; the results indicate an increased fluidity of cell membrane and a higher intracellular ROS formation, resulting in an unexpected S phase cell cycle arrest (25% increase as compared to the control) induced by 9R@ker with respect to free 9R and an induction of cell death.

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Copper–cobalt synergy in Cu_1−xCo_xFe₂O₄spinel ferrite as a highly efficient and regioselective nanocatalyst for the synthesis of 2,4-dinitrotoluene

Cited by 24 publications

References 48 publications

Photocatalytic Degradation of Organic Pollutants over MFe2O4 (M = Co, Ni, Cu, Zn) Nanoparticles at Neutral pH

Photocatalytic Degradation of Organic Pollutants over MFe2O4 (M = Co, Ni, Cu, Zn) Nanoparticles at Neutral pH

Structural characterization and magnetic properties of undoped and copper-doped cobalt ferrite nanoparticles prepared by the octanoate coprecipitation route at very low dopant concentrations

Unprecedented Behavior of (9R)-9-Hydroxystearic Acid-Loaded Keratin Nanoparticles on Cancer Cell Cycle

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