Catalytic and photocatalytic properties of zinc-nickel ferrites

Tsvetkov, Martin; Milanova, Maria; Cherkezova‐Zheleva, Zara; Tsoncheva, Tanya; Zaharieva, Joana; Abrashev, M. V.; Mitov, Ivan

doi:10.1007/s12039-020-01882-2

Cited by 9 publications

(5 citation statements)

References 56 publications

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“…They can be stored in open areas without the threat of environmental pollution. Such compounds include ferrites, which, in addition to high chemical stability, have valuable magnetic properties and are capable of eco-protection of living organisms from electromagnetic radiation [5]. Thus, to address the above issues, the development of technology for processing galvanic sludge using energy-saving ferritization is important and relevant.…”

Section: Literature Review and Problem Statementmentioning

confidence: 99%

Determination of influence of pH on reaction mixture of ferritation process with electromagnetic pulse activation on the processing of galvanic sludge

Kochetov

Samchenko

Arhatenko

2021

EEJET

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This paper considers prospects for increasing the level of environmental safety of industrial enterprises as a result of the implementation of resource-saving technology of processing galvanic sludge using the ferritization method. The effectiveness of the use of electromagnetic pulse discharges for resource-saving activation of the ferritization process with the extraction of heavy metal ions from sludge (Fe, Ni, Cu, Zn) has been confirmed. The influence of key parameters of the process such as the pH value of the reaction mixture and the initial concentrations of metals in the solution on the quality of processing galvanic sludge by ferritization has been experimentally investigated. It was determined that with an increase in the pH value from 8.5 to 10.5 the residual concentrations of metal ions decrease to the values of 0.1÷0.25 mg/dm3 regardless of the total initial concentrations. It has been established that the technique of electromagnetic pulse activation ensures an adequate degree of extraction of metal ions of 99.9 %; it also has indisputable energy advantages compared to the thermal method: energy costs are reduced by more than 60 %. That indicates the suitability of purified water for reuse in galvanic production in terms of the requirements for the content of heavy metal ions in it. In addition, the structural studies of ferritization sediment samples have been carried out. The sediment is characterized by the maximum content of crystalline ferromagnetic phases of ferrite. It was established that an increase in the pH of the initial reaction mixture leads to an increase in the ferrite phase in sedimentation: at pH=10.5, phases were detected, which are characterized by a maximum ferrite content (exceeding 76 %). The proposed resource-saving ferritization process prevents environmental pollution, ensures efficient and rational utilization of raw materials and energy in the industry; it also makes it possible to obtain commodity products from industrial waste.

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Section: Literature Review and Problem Statementmentioning

confidence: 99%

Determination of influence of pH on reaction mixture of ferritation process with electromagnetic pulse activation on the processing of galvanic sludge

Kochetov

Samchenko

Arhatenko

2021

EEJET

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“…More recently this compound seems to be also exploited as possible theranostic system and as substrate for water remediation [5] as well as in catalysis [6] and photocatalysis [7,8].…”

Section: Introductionmentioning

confidence: 99%

Raman spectroscopy in pure and doped zinc ferrites nanoparticles

Albini

Restelli

Ambrosetti

et al. 2023

J Mater Sci: Mater Electron

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Raman spectroscopy was applied on nanostructured ZnFe2O4 system in order to correlate its structural, chemical, and vibrational properties to the functional behaviour, in view of the high sensitivity of the Raman probe to the cationic order in iron oxides. In particular we investigated pure and Ga/Mg doped zinc ferrite nanoparticles synthesised by co-precipitation route by means of Raman spectroscopy with a particular focus on the correlation between their structural and magnetic properties. We firstly studied the homogeneity of the samples at the micrometer scale and their stability under laser irradiation disregarding the presence of spurious iron oxides in favour of a highly defective external shell of the nanoparticles. This hypothesis was corroborated by varying the incident laser wavelength therefore changing the investigated volume. Furthermore, we estimated the inversion degree of the spinel structure finding good agreements with the trend of the magnetic features. All the evidence found through Raman spectroscopy are supported by the results obtained with X-Ray Powder Diffraction, Electron Paramagnetic Resonance and SQUID magnetometry.

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“…Many trace metal ions, such as Na, Mg, K, Ca, Cu, Zn, Fe, and Mn, could also be introduced at the stage of the formation of silk fibroins [ 34 ], and participated in the degradation reaction of MG in a certain humidity environment (ca. 60%RH in this experiment) [ 35 ]. The whole fading process involved radical mechanisms in addition to the N-demethylation reaction; that is, under UV-visible irradiation, oxidation reacted with the help of hydroxyl radicals caused by solvent radiation.…”

Section: Resultsmentioning

confidence: 99%

An Integrated Study on the Fading Mechanism of Malachite Green Industrial Dye for the Marquisette Curtain in the Studio of Cleansing Fragrance, the Palace Museum (Beijing)

Wei

Guo

et al. 2022

Molecules

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Historical marquisette curtains were composed of lightweight fabrics, woven in an open-mesh and leno-type weave, usually made of silk, and found in Qing imperial buildings. As panel curtains, they were exposed to light, and so underwent fading. This study investigated the manufacturing technology and fading mechanism of dyed marquisette fabric from the Studio of Cleansing Fragrance, the Palace Museum (Beijing). The technological aspects were identified. The types of weave, fiber, and adhesive used to fix the curtain to the wooden frame were identified through microscopic observation and infrared spectroscopy. A color change characterization was performed based on UV-visible diffuse reflectance spectra. The textile colorant was identified as malachite green (MG), and its degradation by light was subsequently studied by dynamic photolysis experiments in a kinetic solution for the rapid exploration of by-products. The main degradation pathways were thus identified and the factors responsible for the induced color changes were discussed. A comparison of the liquid chromatography-mass spectrometry (LC–MS) results of the products derived from the photolysis method as well as of the samples extracted from the object allowed for the identification of the presence of different degradation pathways in the faded and unfaded parts of the textile. A metabolomics analysis was applied to account for the differences in the degradation pathways.

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Catalytic and photocatalytic properties of zinc-nickel ferrites

Cited by 9 publications

References 56 publications

Determination of influence of pH on reaction mixture of ferritation process with electromagnetic pulse activation on the processing of galvanic sludge

Determination of influence of pH on reaction mixture of ferritation process with electromagnetic pulse activation on the processing of galvanic sludge

Raman spectroscopy in pure and doped zinc ferrites nanoparticles

An Integrated Study on the Fading Mechanism of Malachite Green Industrial Dye for the Marquisette Curtain in the Studio of Cleansing Fragrance, the Palace Museum (Beijing)

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