Synthesis of nano-sized γ-Al2O3 with controllable size by simple homogeneous precipitation method

Wang, Jiatai; Zhao, Debiao; Zhang, Geng; Zhang, Caihong; Zhang, Peng; Hou, Xiaoyi

doi:10.1016/j.matlet.2020.128476

Cited by 14 publications

(7 citation statements)

References 10 publications

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“…2(a) displayed two broad vibrational bands at 552 and 842 cm −1 , which can be assigned to Al-O stretching vibrations in an octahedral coordination (AlO6) and a tetrahedral coordination (AlO4) sites, respectively. These two bands are characteristics for γ-Al2O3 and these results are in good agreement with the XRD results and the published data [41,50]. On the other hand, calcination of the alumina sample at 1000 °C for 1h gave rise to FT-IR spectrum shown in Fig.…”

Section: Ft-ir Studysupporting

confidence: 91%

“…5 (2021) and α-Al2O3 nanoparticles were found to be 5.8 and 15 nm, respectively. These values are smaller than reported by other research groups [41,49].…”

Section: X-ray Diffraction (Xrd) Studycontrasting

confidence: 69%

“…Furthermore, aluminum oxide is an amphoteric oxide and exists in various polymorphs such as gamma (ɣ-), delta (δ-), theta (ɵ-), rho (ρ-), eta (η-), kappa (ƙ-) and chi (χ)-alumina, in addition to its stable phase (alpha (α)-alumina, corundum) [26]. Among them, alpha-and gamma-alumina have attracted a significant attention of the research groups based on their unique characteristics; therefore, both polymorphs have various applications as mentioned previously [13][14][15][16] plasma synthesis [28], freeze-drying of sulfate solutions [29], the sol-gel method [30,31], laser ablation [32], controlled hydrolysis of metal alkoxide [33], and precipitation [34], precipitation and sol-gel process followed by calcination [35,36], sputtering [37], electrochemical [38], mechanical milling [39], pyrolysis [40], homogenous precipitation followed by calcination [41], and metal organic chemical vapor deposition [42]. However, limitations of these approaches, for both ɣ-and α-alumina nanoparticles, are of great concerns such as long reaction time, uncontrolled particle size, a high-temperature requirement, and use of expensive and toxic organic solvents.…”

Section: Introductionmentioning

confidence: 99%

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Synthesis and characterization of γ-Al2O3 and α-Al2O3 nanoparticles using a facile, inexpensive auto-combustion approach

et al. 2021

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In the present work, we have developed a facile, inexpensive, auto-combustion method for the synthesis of γ-Al2O3 and α-Al2O3 nanoparticles. This was performed by employing aluminum nitrate as an oxidant and glycine as a fuel. The γ-Al2O3 and α-Al2O3 nanoparticles were obtained by calcination of the combusted products at 800 °C for 2 h and at 1000 °C for 1 h, respectively. The generated alumina nanoparticles were characterized by using X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FT-IR), field-emission scanning electron microscope (FE-SEM), high-resolution transmission electron microscope (HRTEM), and thermal analyses (TG and DTA). The average crystallite sizes of γ-Al2O3 and α-Al2O3 nanoparticles were estimated to be 5.8 nm and 15 nm, respectively. The TEM results revealed that the prepared alumina nanostructures were of low agglomeration degree. The proposed method exhibited that the phases of the produced alumina nanoparticles could be carefully tuned by the adapted experimental conditions.

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Section: Ft-ir Studysupporting

confidence: 91%

“…5 (2021) and α-Al2O3 nanoparticles were found to be 5.8 and 15 nm, respectively. These values are smaller than reported by other research groups [41,49].…”

Section: X-ray Diffraction (Xrd) Studycontrasting

confidence: 69%

Section: Introductionmentioning

confidence: 99%

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Synthesis and characterization of γ-Al2O3 and α-Al2O3 nanoparticles using a facile, inexpensive auto-combustion approach

et al. 2021

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“…Further, two bands at 875.34, 575.12 cm − 1 , which belong to Al-O and Al-O-Al vibrations, indicated the formation of nano γ-Al 2 O 3 [27].…”

Section: Resultsmentioning

confidence: 94%

Synthesis and Characterization of nano γ-Alumina/β -Cyclodextrin as Adsorbent for Heavy Metal Adsorption

Leila,

Nazanin,

Shahbazi

et al. 2023

Preprint

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Nano γ-alumina (γ-Al2O3) is widely used to adsorb heavy metals due to excellent properties such as high surface area, thermal stability, and high adsorption capacity. Due to poor adsorption of toxic metals on nano γ-Al2O3 surface, coating with β-cyclodextrin improves its adsorption efficiency. The aim of this study was to synthesize nano γ-Al2O3/β-cyclodextrin by co-precipitation method to be used for future study in Cd(II) removal. The Fourier Transmission Infrared (FT-IR) spectroscopy, X- ray powder Diffraction (XRD) and, Scanning Electron Microscope (SEM) were evaluated. The results of XRD and SEM showed nano γ-Al2O3/β-cyclodextrin with 20–30 nm. Also, synthesized nano γ-Al2O3/β-cyclodextrin had suitable structure for cadmium removal as water toxic metal.

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“…Typically, gibbsite (γ-Al(OH) 3 ) and boehmite (γ-AlOOH) are used as precursors to synthesize nanostructured γ-Al 2 O 3 particles [ 11 , 12 ]. Various methods have been developed to synthesize γ-Al 2 O 3 nanocrystals including precipitation [ 3 , 13 , 14 , 15 , 16 , 17 , 18 ], sol-gel synthesis [ 4 , 19 , 20 , 21 , 22 ], combustion [ 23 ], hydrolysis [ 24 , 25 ], and high-pressure compaction [ 26 ]. It was shown that the final structure, morphology, and properties of γ-Al 2 O 3 nanocrystals largely depend on the synthetic routes and experimental parameters.…”

Section: Introductionmentioning

confidence: 99%

Inductively Coupled Nonthermal Plasma Synthesis of Size-Controlled γ-Al2O3 Nanocrystals

et al. 2023

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Gamma alumina (γ-Al2O3) is widely used as a catalyst and catalytic support due to its high specific surface area and porosity. However, synthesis of γ-Al2O3 nanocrystals is often a complicated process requiring high temperatures or additional post-synthetic steps. Here, we report a single-step synthesis of size-controlled and monodisperse, facetted γ-Al2O3 nanocrystals in an inductively coupled nonthermal plasma reactor using trimethylaluminum and oxygen as precursors. Under optimized conditions, we observed phase-pure, cuboctahedral γ-Al2O3 nanocrystals with defined surface facets. Nuclear magnetic resonance studies revealed that nanocrystal surfaces are populated with AlO6, AlO5 and AlO4 units with clusters of hydroxyl groups. Nanocrystal size tuning was achieved by varying the total reactor pressure yielding particles as small as 3.5 nm, below the predicted thermodynamic stability limit for γ-Al2O3.

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Synthesis of nano-sized γ-Al2O3 with controllable size by simple homogeneous precipitation method

Cited by 14 publications

References 10 publications

Synthesis and characterization of γ-Al2O3 and α-Al2O3 nanoparticles using a facile, inexpensive auto-combustion approach

Synthesis and characterization of γ-Al2O3 and α-Al2O3 nanoparticles using a facile, inexpensive auto-combustion approach

Synthesis and Characterization of nano γ-Alumina/β -Cyclodextrin as Adsorbent for Heavy Metal Adsorption

Inductively Coupled Nonthermal Plasma Synthesis of Size-Controlled γ-Al2O3 Nanocrystals

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