Microwave‐assisted pyrolysis of organometallic gel prepared through ternary combination of surfactants for fabrication of nano‐porous gamma alumina: adsorptive properties, characterization

Abstract

BACKGROUND In present work, γ‐Al2O3 nanoparticles, with uniform morphology and controllable size, were successfully fabricated by the microwave‐assisted pyrolysis of organometallic gels prepared through the application of aluminum nitrite, urea, glycine, and triple mixed surfactants. A series of pyrolysis reactions were carried out by the conventional and microwave treatments to achieve nano‐porous powders. The effects of different process factors, such as fuel composition, pyrolysis method, calcination temperature, and surfactant mixing ratio, on the adsorptive properties and physico‐chemical characteristics of powders were investigated. RESULTS γ‐Al2O3 nanoparticles (10–20 nm) were successfully synthesized through optimized process variables. Although the calcination temperature is a significant variable in altering adsorptive properties, microwave pyrolysis causes a reduction in the calcination temperature (700 °C). Cetyl trimethyl ammonium bromide (CTAB), which is a cationic surfactant, mixed with a non‐ionic surfactant (Triton‐X‐100) can produce nano‐sized γ‐Al2O3 particles. The stoichiometric aluminum nitrate‐urea admixed with surfactants produced a powder with higher specific surface area, 238 m2 g−1, which is comparable with that obtained via the salt‐urea‐glycine system. CONCLUSION Though mesoporous powder with a large surface area can be synthesized by urea‐glycine system, the employment of triple surfactant system admixed with urea may be a reliable route to produce mesoporous powder economically. © 2020 Society of Chemical Industry

New Construction of Functionalized CuO/Al2O3 Nanocomposite-Based Polymeric Sensor for Potentiometric Estimation of Naltrexone Hydrochloride in Commercial Formulations

“…Some recent studies reported the synthesis of CuONPs and Al 2 O 3 NPs by various techniques, including pyrolysis, sol-gel, sputtering, laser ablation and electrochemical reduction [23][24][25][26][27][28][29][30][31][32]. Sodeifian and Behnood [33] reported a microwave-assisted method for the synthesis of CuO/Al 2 O 3 nanocomposite for photocatalytic degradation of methylene blue removal from aqueous solution under UV irradiation.…”

Advances in Microwave Synthesis of Nanoporous Materials

“…For example, Salem et al. [ 204 ] obtained γ‐Al 2 O 3 using microwave‐assisted pyrolysis of an organometallic gel. The gel consisting of aluminum nitrate [Al(NO 3 ) 3 ·9H 2 O] and fuel (urea and glycine) was heated in the microwave oven with a frequency of 2.45 GHz and then calcined at 800 °C to produce gamma phase.…”

“…Porous metal oxides obtained via microwave‐assisted methods with their SSA values and potential applications are summarized in Table 6 . [ 175–215 ]…”

Recent Advancements in the Fabrication of Functional Nanoporous Materials and Their Biomedical Applications

“…Here, inorganic salts acted as microwave absorber. The technique has also been expanded to fabricate nanoporous aluminum oxide and titanium dioxide (TiO 2 ) [ 117 , 118 ]. The exposure of microwave irradiation to the precursor solution prepared by mixing of titanium tetraisopropoxide with HCl or HBr resulted in the fabrication of nanoporous TiO 2 with an average pore size of 14.5 nm [ 118 ].…”