Simplified waste-free process for synthesis of nanoporous compact alumina under technologically advantageous conditions

Fedoročková, Alena; Sučik, Gabriel; Plešingerová, Beatrice; Popovič, Ľuboš; Kovaľaková, Mária; Vávra, M.

doi:10.1039/d0ra06544g

Cited by 6 publications

(1 citation statement)

References 44 publications

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“…Afterward, the polished specimen was etched using Keller's solution (100 mL distilled water, 2.5 mL 69% HNO 3 , 1.5 mL 33% HCl, and 1 mL 48% HF) at about 50 • C for analysis of the microstructure. Metallographic details about aluminum and its alloys are abundant in the literature [30,31].…”

Section: Starting Materials and Scanning Electron Microscope Examinationmentioning

confidence: 99%

Synthesis of Nanostructured Alumina from Byproduct Aluminum Filings: Production and Characterization

Esaifan,

Al-Mobydeen,

Al-Masri

et al. 2023

Inorganics

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Aluminum oxide production from aluminum filings, which are a byproduct of several industrial machining processes and cannot be recycled to attain bulk aluminum (Al), is vital due to its wide use in scientific research and industry. The goal of this paper is to produce ultrafine and down-to-the-nanoscale alumina powder (Al2O3), starting from a waste Al filings. The microstructure and composition of the starting Al used were investigated using scanning electron microscopy (SEM), which was equipped with an attached energy dispersive spectrometer (EDS) unit. The results of this investigation confirmed that the starting Al was mainly Al–Mg alloy. Al2O3 was produced using two routes: The first involved the burning of aluminum hydroxide Al(OH)3 that was precipitated from aluminum chloride solution (AlCl3) resulting from dissolving the Al filings in 2M HCl. The second route involved direct precipitation as a reaction product of aluminum chloride with sodium carbonate solution. The Al2O3 produced using both routes, as well as the intermediate product Al(OH)3, were studied by SEM. The results demonstrate that the nanoscale range size was reached after milling of the produced Al2O3. Following thorough washing with distilled water, the EDS and the XRD techniques confirmed the formation of Al2O3, with no residual salt detected. The EDS results showed that the ratios of Al and O in the produced Al2O3 were about 96% of the ideal compound ratios. The XRD analysis also revealed the amorphous structure of the standard and the produced Al(OH)3, whereas the phases of the produced Al2O3 were either crystalline or amorphous. In our study, the Al2O3 percentage yield was about 77%, and this value obviously depends on the percentage of Al dross in the original Al filings. Overall, this research provides a novel contribution to the production of alumina powder in the nano-range starting from an aluminum filings byproduct, thereby reducing the dependence on known sources of aluminum.

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Section: Starting Materials and Scanning Electron Microscope Examinationmentioning

confidence: 99%

Synthesis of Nanostructured Alumina from Byproduct Aluminum Filings: Production and Characterization

Esaifan,

Al-Mobydeen,

Al-Masri

et al. 2023

Inorganics

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Carbon Dioxide as a Sustainable Reagent in Circular Hydrometallurgy

Rivera,

Binnemans

2024

ChemSusChem

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This review highlights the use of CO2 as a reagent in hydrometallurgy, with emphasis on the new concept of circular hydrometallurgy. It is shown how waste CO2 can be utilised in hydrometallurgical operations for pH control or regeneration of acids for leaching. Metal‐rich raffinate solutions generated after removal of the valuable metals can serve as feedstocks for mineral carbonation, providing alternative avenues for CO2 sequestration. Furthermore, CO2 can also be used as a renewable feedstock for the production of chemical reagents that can find applications in hydrometallurgy as lixiviant, as precipitation reagent or for pH control. Mineral carbonation can be combined with chemical reactions involving metal complexation reagents, as well as with solvent extraction processes for the concurrent precipitation of metal carbonates and acid regeneration. An outlook for future research in the area is also presented.

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Synthesis and characterisation of mesoporous MgAl2O4 hollow spheres as a high-value product in a waste recovery strategy

Fedoročková,

Kalaposová,

Plešingerová

et al. 2023

Ceramics International

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Simplified waste-free process for synthesis of nanoporous compact alumina under technologically advantageous conditions

Abstract: Flow chart of the proposed process for production of nanoporous alumina monoliths.

Cited by 6 publications

References 44 publications

Synthesis of Nanostructured Alumina from Byproduct Aluminum Filings: Production and Characterization

Synthesis of Nanostructured Alumina from Byproduct Aluminum Filings: Production and Characterization

Carbon Dioxide as a Sustainable Reagent in Circular Hydrometallurgy

Synthesis and characterisation of mesoporous MgAl2O4 hollow spheres as a high-value product in a waste recovery strategy

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