Solid-state synthesis of heterogeneous Ni0.5Cu0.5-xZnxFe2O4 spinel oxides with controlled morphology and tunable dielectric properties

Afzal, Adeel; Abuilaiwi, Faraj Ahmad; Javaid, Rahat; Ali, Farman; Habib, Amir

doi:10.1007/s10854-020-03982-8

Cited by 18 publications

(7 citation statements)

References 55 publications

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“…These lattice parameters are consistent with the values reported in the literature (Awan et al, 2018). The crystallite size is determined by Debye-Scherer's formula (Afzal et al, 2020). The average crystallite size of the ZnO and ZnO/Zn(OH) 2 nanoparticles is found to be 16.6 and 18.0 nm, respectively.…”

Section: Characterizationsupporting

confidence: 88%

ZnO/Zn(OH)2 nanoparticles and self-cleaning coatings for the photocatalytic degradation of organic pollutants

Faheem

Siddiqi

Habib

et al. 2022

Front. Environ. Sci.

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Zinc oxide (ZnO) nanostructures have emerged as efficient heterogeneous photocatalysts for the degradation of organic pollutants in aqueous solutions and industrial wastewaters. In this work, a simple and effective method is reported for the synthesis of zinc oxide/zinc hydroxide (ZnO/Zn(OH)2) hybrid nanoparticles using a mineral acid to enhance the photocatalytic activity of ZnO. Infrared spectroscopy reveals the presence of hydroxyl groups in ZnO/Zn(OH)2 nanoparticles. X-ray diffraction shows the formation of hexagonal wurtzite ZnO nanoparticles, which retain their wurtzite structure after acid treatment but additional diffractions for Zn(OH)2 are also recorded. The optical bandgap of resulting ZnO and ZnO/Zn(OH)2 nanoparticles is reduced to 3.05 and 3.08 eV, respectively. In the initial photocatalysis experiments, ZnO/Zn(OH)2 nanoparticles exhibit 3.5-times improved degradation and removal of sunset yellow dye, a model organic pollutant, from deionized water compared to pristine ZnO nanoparticles. Hence, for further studies, ZnO/Zn(OH)2 coatings are fabricated on glass slides with a uniform surface morphology as shown by the atomic force microscopy. The time-dependent UV-visible spectroscopy reveals the photocatalytic degradation of sunset yellow over the surface of ZnO/Zn(OH)2 coatings. The degradation reaction follows the pseudofirst-order mechanism with a rate constant of 2.9 × 10–2 min−1. The recyclability and stability experiments reveal the retention of appreciable photocatalytic activity of ZnO/Zn(OH)2 coatings (with >92% degradation efficiency after six successive cycles). The results are compared with recent examples from the pertinent literature. The surface hydroxyl groups on ZnO/Zn(OH)2 nanoparticles and bandgap lowering enhance the anchoring of dye molecules and electron transfer reactions.

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Section: Characterizationsupporting

confidence: 88%

ZnO/Zn(OH)2 nanoparticles and self-cleaning coatings for the photocatalytic degradation of organic pollutants

Faheem

Siddiqi

Habib

et al. 2022

Front. Environ. Sci.

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“…The values of 'a' increase from 8.351 Å to 8.392 Å, with the substitution of Sm 3+ from x = 0.00 up to x = 0.008, respectively. This suggests that Sm 3+ ions with a higher ionic radius (0.96 Å) were effectively substituted in the Fe 3+ sites of a lower ionic radius (0.645 Å), following Vegard's law [48]. Similar findings were obtained for Mg-Ni-Co ferrites doped with La 3+ , and Gd 3+ ions, respectively [49,50].…”

Section: Xrdsupporting

confidence: 68%

Structural, Magnetic, and Mössbauer Investigation of Mg-Ni-Co ferrites doped by Sm³⁺ sions

Matar,

Rabaa,

Moussa

et al. 2023

Phys. Scr.

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Samarium-doped magnesium-nickel-cobalt nanoferrites (Mg1/3 Ni1/3Co1/3)Fe2-xSmxO4, with x = 0.00, 0.01, 0.02, 0.04, and 0.08, were synthesized by the coprecipitation method. X-ray diffractometer (XRD), transmission electron microscopy (TEM), energy dispersive X-ray (EDX), X-ray photoelectric spectroscopy (XPS), Fourier Transform Infra-Red (FTIR), Raman spectroscopy, Mössbauer spectroscopy, and magnetic measurement techniques were used, to study the structure, microstructure, and magnetic properties of the samples. The formation of the cubic spinel structure was confirmed by Rietveld analysis of the XRD data and by the appearance of the two absorption bands close to 400 cm-1 and 600 cm-1 from the FTIR spectrum. Raman spectroscopy verified the formation of the spinel phase in the samples. The elemental composition, valency, and cationic distribution were examined using X-ray photoelectric spectroscopy (XPS) measurements. Experimental findings revealed that doping with Sm3+ ions had a significant effect on the magnetic properties of nanoparticles. The saturation magnetization (Ms) and coercivity field (Hc) values fluctuate depending on the crystallite size (DXRD) of the samples from XRD analysis as the Sm3+ content increases. The magnetization dependence on the applied field was investigated at different ranges of applied fields based on the output of the statistical parameters for the curve fitted using four different forms of the law of approach to saturation. The statistical parameters and physically significant fitted parameters give information on the dependence of magnetization over various applied field regions. A thorough investigation of the output parameters from fitting into various equations reveals that the composition of Mg-Ni-Co ferrites exhibits a dependence of magnetization on the applied field. Room-temperature Mössbauer spectra displayed a mix of the magnetic sextet and central quadrupole doublet, with improvement in the magnetic sextet in the Sm-doped samples. Moreover, Mössbauer spectra at 77 K showed the demise of the quadrupole doublet in all samples and showed two sextets (tetrahedral and octahedral sites). Sm-doping reduced the values of the hyperfine magnetic field of both sextets. All Fe ions can be found in the Fe3+ state, according to the isomer shift values and there is a migration of Fe3+ ions from octahedral to tetrahedral sites upon Sm doping, which was confirmed by XPS measurements.

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“…Due to their toxicity, they disrupt soil microbes and ultimately reduce crop yields [7,8]. When it comes to exporting textiles, Pakistan ranks at number eight.…”

Section: Introductionmentioning

confidence: 99%

Methylene Blue (MB) removal from Aqueous Solution by Alum; Catalytic Ozonation Process

Ikhlaq,

Parveen,

Masood

et al. 2023

Preprint

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The Textile wastewater is among the most polluted types of industrial waste. Wastewater treatment in the textile industries is notoriously difficult because of the use of complex chemicals, Dyes in the textile production steps and conventional methods are not enough to treat these chemicals. Textile wastewater, known for its high pollution levels, poses challenges for treatment due to complex chemicals and dyes. A comparative study was conducted on simple ozonation and catalytic ozonation using alum as a catalyst for degrading methylene blue. Various factors like time, pH, catalyic and ozone dosage were analyzed. Results showed that catalytic activity in ozonation is pH and ozone flow dependent. pH 6.6 and 200V ozone flow achieved maximum methylene blue elimination. Scanning electron microscopy (SEM) was used to characterize surface morphology of catalyst, (FTIR) Fourier transform infrared spectroscopy was used to identify the important functional groups, and energy dispersive X-ray spectroscopy (EDS) was used to characterize the catalyst's elemental composition. Compared to simple ozonation, catalytic ozonation showed higher removal in the initial phase. Real textile wastewater analysis confirmed the effectiveness of alum catalyst in achieving significant removal of methylene blue (87%) through this novel cost-efficient process.

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Solid-state synthesis of heterogeneous Ni0.5Cu0.5-xZnxFe2O4 spinel oxides with controlled morphology and tunable dielectric properties

Cited by 18 publications

References 55 publications

ZnO/Zn(OH)2 nanoparticles and self-cleaning coatings for the photocatalytic degradation of organic pollutants

ZnO/Zn(OH)2 nanoparticles and self-cleaning coatings for the photocatalytic degradation of organic pollutants

Structural, Magnetic, and Mössbauer Investigation of Mg-Ni-Co ferrites doped by Sm³⁺ sions

Methylene Blue (MB) removal from Aqueous Solution by Alum; Catalytic Ozonation Process

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Solid-state synthesis of heterogeneous Ni0.5Cu0.5-xZnxFe2O4 spinel oxides with controlled morphology and tunable dielectric properties

Cited by 18 publications

References 55 publications

ZnO/Zn(OH)2 nanoparticles and self-cleaning coatings for the photocatalytic degradation of organic pollutants

ZnO/Zn(OH)2 nanoparticles and self-cleaning coatings for the photocatalytic degradation of organic pollutants

Structural, Magnetic, and Mössbauer Investigation of Mg-Ni-Co ferrites doped by Sm3+ sions

Methylene Blue (MB) removal from Aqueous Solution by Alum; Catalytic Ozonation Process

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Structural, Magnetic, and Mössbauer Investigation of Mg-Ni-Co ferrites doped by Sm³⁺ sions