Nano-alumina powders/ceramics derived from aluminum foil waste at low temperature for various industrial applications

El‐Amir, Ahmed A. M.; Ewais, Emad M.M.; Abdel-Aziem, A.; Ahmed, Alaa H.; El‐Anadouli, Bahgat E.

doi:10.1016/j.jenvman.2016.08.072

Cited by 37 publications

(11 citation statements)

References 37 publications

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“…The complete transformation into the thermodynamically stable α‐alumina phase (JCPDS No. 43‐1484) takes place after calcination at 1050°C, a temperature lower than the typically expected (1100‐1200°C) …”

Section: Resultsmentioning

confidence: 74%

α‐Alumina nanospheres from nano‐dispersed boehmite synthesized by a wet chemical route

2018

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In this work, stable aqueous suspensions of nano-boehmite were developed through a hybrid wet-chemical route that uses hyperbranched dendritic poly(ethylene)imine (PEI) as template material for boehmite formation aiming at the development of a deagglomerated a-alumina nanopowder after calcination. The method involves firstly the interaction between the Al precursor and PEI followed by the hydrolysis and polycondensation reactions. The study was aiming to investigate the effect of solids content and pH during reactions on both the stability of the final suspension and the morphology of the resulting nanocrystals. For this purpose, the suspensions were evaluated through viscosity measurements, zeta potential analyses, FT-IR, DLS and sedimentation studies, whereas after the proper centrifugation, drying, and calcination steps, the as-received nanocrystals were evaluated through SEM, TEM and XRD studies. In addition, the boehmite nanopowder was studied using Thermogravimetric and Differential Thermal Analysis, whereas its sinterability was evaluated by dilatometric measurements. The investigation showed that the conditions employed affect greatly both the morphology of nanocrystals as well as the dispersion and the stability of the suspensions. The boehmite suspension with the optimum dispersion and stability can lead, after calcination at 1050°C, to a fine deagglomerated a-alumina nanopowder with a mean size at about 10 nm. K E Y W O R D S a-alumina, boehmite, dispersion, hyperbranched poly(ethylene)imine, nanoparticles, nanopowder, suspensions

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Section: Resultsmentioning

confidence: 74%

α‐Alumina nanospheres from nano‐dispersed boehmite synthesized by a wet chemical route

2018

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“…At first, Mg and Al scraps were utilized for preparation of MA spinel via co‐precipitation method 19,20 . In a typical procedure, Al and Mg wastes were respectively dissolved in diluted aqua regia and nitric acid.…”

Section: Methodsmentioning

confidence: 99%

“…At first, Mg and Al scraps were utilized for preparation of MA spinel via co-precipitation method. 19,20 In a typical procedure, Al and Mg wastes were respectively dissolved in diluted aqua regia and nitric acid. Thereafter, aluminum nitrate aqueous solution was dropewisely added to a stirring aqueous solution of magnesium nitrate in order to produce MgO/Al 2 O 3 molar ratio of one-to-one.…”

Section: Raw Materials and Powder Processingmentioning

confidence: 99%

Effect of waste‐derived MA spinel on sintering and stabilization behavior of partially stabilized double phase zirconia

El‐Amir

Abdelgawad

et al. 2020

Int J Applied Ceramic Tech

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Cubic-stabilized zirconia ceramic composites have been synthesized by conventional sintering, starting from commercial m-ZrO 2 , Y 2 O 3 , and waste-derived magnesium aluminate spinel (MA) powders. In this work, the effect of sintering temperature and MA content on stabilization and densification properties of YSZ have been duly considered. MA-free YSZ0 composite sintered at 1600°C-1700°C revealed m-and t-ZrO 2 dual-phase structure where its m-ZrO 2 was partially stabilized upon temperature rising into tetragonal phase by Y 3+ diffusion inside zirconia structure. YSZ10-50 composites containing 10-50 wt% MA demonstrated dissimilar behavior where their m-ZrO 2 was transformed and stabilized into a cubic form by diffusion of Y 3+ , Mg +2 , and Al +3 inside zirconia lattice. Furthermore, densification of YSZ10-50 powder mixtures by conventional sintering at 1600°C for 2 hours resulted in fully dense compacts with micrometer-sized grains. The outcomes indicate that MA has a significant effect on m-ZrO 2 stabilization into the cubic phase structure at room temperature. In this respect, this study offers huge potentials for developing fully stabilized c-ZrO 2 ceramics that could be possibly used as industrial ceramics for structural applications of harsh chemical and thermal environmental conditions.

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“…Recently, Al foil was used in H 2 production by converting it into active Al powder that reacts with water producing H 2 7 or by using Ca(OH) 2 to remove the surface oxide layer and initiate the hydration reaction of Al foil 8 . Furthermore, α-Al 2 O 3 was prepared at a low calcination temperature (1100 °C) for the industrial applications such as refractory materials, however, aqua regia was used during the preparation procedures, consequently, the release of NO x emissions is possible during the preparation, which is harmful to the environment 9 . Qin et al .…”

Section: Introductionmentioning

confidence: 99%

A Facile Green Synthetic Route for the Preparation of Highly Active γ-Al2O3 from Aluminum Foil Waste

Osman

Abu‐Dahrieh

McLaren

et al. 2017

Sci Rep

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A novel green preparation route to prepare nano-mesoporous γ-Al2O3 from AlCl3.6H2O derived from aluminum foil waste and designated as ACFL550 is demonstrated, which showed higher surface area, larger pore volume, stronger acidity and higher surface area compared to γ-Al2O3 that is produced from the commercial AlCl3 precursor, AC550. The produced crystalline AlCl3.6H2O and Al(NO3)3.9H2O in the first stage of the preparation method were characterized by single-crystal XRD, giving two crystal structures, a trigonal (R-3c) and monoclinic (P21/c) structure, respectively. EDX analysis showed that ACFL550 had half the chlorine content (Cl%) relative to AC550, which makes ACFL550 a promising catalyst in acid-catalysed reactions. Pure and modified ACFL550 and AC550 were applied in acid-catalysed reactions, the dehydration of methanol to dimethyl ether and the total methane oxidation reactions, respectively. It was found that ACFL550 showed higher catalytic activity than AC550. This work opens doors for the preparation of highly active and well-structured nano-mesoporous alumina catalysts/supports from aluminum foil waste and demonstrates its application in acid-catalysed reactions.

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Nano-alumina powders/ceramics derived from aluminum foil waste at low temperature for various industrial applications

Cited by 37 publications

References 37 publications

α‐Alumina nanospheres from nano‐dispersed boehmite synthesized by a wet chemical route

α‐Alumina nanospheres from nano‐dispersed boehmite synthesized by a wet chemical route

Effect of waste‐derived MA spinel on sintering and stabilization behavior of partially stabilized double phase zirconia

A Facile Green Synthetic Route for the Preparation of Highly Active γ-Al2O3 from Aluminum Foil Waste

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