Template-free synthesis of mesoporous γ-alumina with tunable structural properties

Xu, Naicai; Liu, Zhong; Bian, Shaoju; Dong, Yaping; Li, Wu

doi:10.1016/j.ceramint.2015.11.079

Cited by 35 publications

(14 citation statements)

References 39 publications

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“…Figure h and i are the TEM images of a typical single nanotube, showing the hollow nature and the smaller size in diameter (∼6 nm) and wall thickness (∼1–2 nm). The FTIR (Figure S1a in the Supporting Information) and TG-DTA (Figure S2) results are precisely consistent with the results in previous literature, ,− effectively confirming the as-obtained products are a pure-phase γ-AlOOH.…”

supporting

confidence: 90%

Novel Synthesis Strategy of γ-AlOOH Nanotubes: Coupling Reaction via Ionic Liquid-Assisted Hydrothermal Route

Qin

Kim

Duan

et al. 2016

Crystal Growth & Design

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A novel synthetic strategy, i.e., transition metal ions used to drive a coupling reaction in terms of complex formation of the metal ions and decomposition of a precursor, combined with ionic liquid-assisted hydrothermal route, was utilized to synthesize γ-AlOOH nanotubes with high purity and uniform dimension at a mild condition. These γ-AlOOH nanotubes can be easily transformed to γ-Al 2 O 3 nanotubes by calcining at 600 °C for 2 h, without changing the morphology. More specifically, this strategy may be helpful to develop a new opportunity for synthesis of inorganic nanomaterials with novel morphologies and improved properties.

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supporting

confidence: 90%

Novel Synthesis Strategy of γ-AlOOH Nanotubes: Coupling Reaction via Ionic Liquid-Assisted Hydrothermal Route

Qin

Kim

Duan

et al. 2016

Crystal Growth & Design

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“…The bands at 1732 cm −1 and 1261 cm −1 can be attributed to the stretching vibration of C=O bond and the stretching vibration of C‐OH respectively, which indicating GO contains COOH and OH functional groups . The bands at 791 cm −1 and 603 cm −1 of γ‐Al 2 O 3 can be classified as the characteristic absorption peak of Al−O bond in [AlO 6 ] . It also can be seen that GO/Al 2 O 3 not only shows the stretching vibration peak of C=O at 1718 cm −1 and the stretching vibration peak of C‐OH at 1226 cm −1 , but also displays the bending vibration peak of Al−O bond near in 575 cm −1 , which further indicating γ‐Al 2 O 3 was successfully modified onto the GO and GO/Al 2 O 3 composite was obtained.…”

Section: Resultsmentioning

confidence: 95%

“…In order to further clarify the mechanism of fluoride removal, FTIR spectrum of GO/Al 2 O 3 before and after fluoride adsorption was investigated and the result was shown in Figure . It is obvious that the characteristic adsorption peaks wavenumber in 3428 cm −1 and 1631 cm −1 can be attributed to the stretching vibration and bending vibration of O−H bond which come from the water on the surface of GO/Al 2 O 3 before fluoride adsorption . However, when adsorption process occurred, the characteristic adsorption peaks of GO/Al 2 O 3 at 3428 cm −1 and 1631 cm −1 moved to 3447 cm −1 and 1632 cm −1 , respectively.…”

Section: Resultsmentioning

confidence: 95%

Removal of Fluoride by Graphene Oxide/Alumina Nanocomposite: Adsorbent Preparation, Characterization, Adsorption Performance and Mechanisms

et al. 2020

ChemistrySelect

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GO/Al2O3 was successfully prepared by using hydrothermal method which was used to study the removing of fluoride from water. The characterization results of X‐ray diffraction (XRD), transmission electron microscope (TEM) and Fourier transform infrared (FT‐IR) spectra indicated that γ‐Al2O3 had been modified onto GO nanosheets. The BET surface area of GO/Al2O3 is 326.22 m2 g−1 and the corresponding pore size center at 3.7 nm. A batch of fluoride adsorption experiments were employed to investigate the effects of various factors such as solution pH values, contact time, fluoride initial concentrations, temperature, adsorbent dose, co‐existing anions, and recycling on fluoride removal. The results showed that the adsorption capacity (4.68 mg g‐1) of GO/Al2O3 is higher than that of γ‐Al2O3 (3.04 mg g−1). In addition, the modified adsorbent had a wide range of pH applications. Adsorption kinetics is well represented by the pseudo‐second‐order model, which indicating the adsorption processes are involved in chemisorption with ion exchange. The influences of co‐existing anions on fluoride removal followed the decreasing order of PO43‐>HCO3‐>SO42‐>Cl‐>NO3‐, which was related to the charge and radius of ions. The recycle performance of GO/Al2O3 is not so good owing to the poor strength of GO during the cycle process. Fluoride adsorption onto GO/Al2O3 could be attributed to electrostatic attraction, ligand exchange, ion exchange and hydrogen‐bond interaction between fluoride and OH groups.

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“…For these samples, BET surface area of 206.089 and 212.236 m 2 .g -1 and pore volume of 0.290 and 0.723 cm 3 .g -1 , respectively, were observed. All results revealed that the kinds of Al resources and even precipitant agents control the morphologies and physical properties of γ-alumina effectively [71].…”

Section: Amorphous and γ Aluminamentioning

confidence: 92%

Alumina applied in bone regeneration: Porous α-alumina and transition alumina

et al. 2022

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Alumina is a polymorphic bioceramic that has been extensively investigated for application in bone regeneration. Dense α-alumina has been considered a suitable biomaterial for dental and orthopedic implants due to its superior mechanical properties. However, its use is limited due to its high inertia in a biological environment. Recent investigations have focused on its distinct phases and surface characteristics through the control of morphology, physical properties, and chemical composition to enhance bioactivity. This article presents a brief review of the developments in porous α-alumina and amorphous-γ-alumina transition. Most studies have shown that composites and alumina coated with bioactive materials, high surface area, and hydroxylated surface can significantly improve biological properties. Cellular responses such as fixation, growth, and proliferation, as well as biomineralization, are the main studies to validate improvements in bioactive properties.

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Template-free synthesis of mesoporous γ-alumina with tunable structural properties

Cited by 35 publications

References 39 publications

Novel Synthesis Strategy of γ-AlOOH Nanotubes: Coupling Reaction via Ionic Liquid-Assisted Hydrothermal Route

Novel Synthesis Strategy of γ-AlOOH Nanotubes: Coupling Reaction via Ionic Liquid-Assisted Hydrothermal Route

Removal of Fluoride by Graphene Oxide/Alumina Nanocomposite: Adsorbent Preparation, Characterization, Adsorption Performance and Mechanisms

Alumina applied in bone regeneration: Porous α-alumina and transition alumina

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