Solvothermal-assisted evaporation-induced self-assembly of ordered mesoporous alumina with improved performance

Biomolecule‐Assisted Synthesis of Hierarchical Multilayered Boehmite and Alumina Nanosheets for Enhanced Molybdenum Adsorption

“…It is known that γ‐AlOOH possesses layered structures, with each layer consisting of parallel double chains of octahedral AlO 6 units with hydroxyl groups present in the interlayer spacing . This is supported by the 27 Al NMR spectra of the time‐dependent γ‐AlOOH samples (Figure ), which show the existence of a single symmetric peak at around δ =6.5–7 ppm associated with octahedral AlO 6 …”

“…[58] This is supported by the 27 Al NMR spectra of the time-dependent g-AlOOHs amples ( Figure 2), which show the existence of as ingle symmetric peak at around d = 6.5-7 ppm associated with octahedral AlO 6 . [59] l-Alanine, ase nantiomer of d-alanine, was used to investigate the influence of the stereoisomer of the chiral biomolecule on the mesostructure and morphology of the resulting g-AlOOH product. The XRD pattern of the sample synthesized with l-alanine [AlEG-l-Ala(1)] can also be indexed to g-AlOOH ( Figure S4 in the Supporting Information).H owever,t he SEM images shown in Figures 3c and dr eveal that the hierarchical g-AlOOHm ultilayeredn anosheets obtained by using l-alanine [AlEG-l-Ala(1)] have ar ather non-homogeneous size compared to those prepared with d-alanine [AlEG-Ala(1)] (Figures 3a and b).…”

Synthesis of Ordered Mesoporous Zr-Al Composite Oxides with Excellent Structural and Textural Properties and Extremely High Stability

“…The detailed textural properties of these samples are listed in Table 1 . From Figure 5 a, it can be seen that all samples exhibited typical IV-type isotherms with relatively steep capillary condensation steps, signifying the presence of uniform mesopores [ 8 , 26 ]. It is noteworthy that samples OMZA-x (except for OMZA-2) demonstrated a steeper capillary condensation step than that of sample OMA, corresponding to a much narrower mesoporous size distribution ( Figure 5 b), which is well in accordance with the characterization result from the small-angle XRD analysis ( Figure 2 ).…”

“…Here, a triconstituent cooperative co-assembly process was proposed for explaining the synthesis of OMZA-x, as shown in Figure 1 . In an anhydrous ethanol solvent with a weak polarity, the triblock copolymer surfactant F127 molecules usually lose their hydrophilic-hydrophobic properties [ 18 , 26 , 38 ]. Consequently, when inorganic precursors of Zr and Al have not been added into the reaction solution, it is difficult to directly form the micelle phase of surfactant F127 molecules, although the introduction of citric acid and hydrochloric acid containing a certain amount of H 2 O can facilitate the folding of surfactant molecules.…”

“…The evaporation induced self-assembly (EISA) method is another soft-template self-assembly approach for the successful preparation of ordered mesoporous materials, especially ordered mesoporous metal oxides [ 7 , 8 , 21 , 22 , 23 ]. Via such a method, a series of ordered mesoporous alumina materials with different mesostructures and tunable mesoporous sizes have also been successfully prepared by adjusting the hydrophilic-hydrophobic properties of surfactants or introducing suitable catalysts into the initial synthesis solution [ 8 , 24 , 25 , 26 ]. During the EISA process, the utilization of volatile non-aqueous solvents (such as anhydrous ethanol and tetrahydrofuran) can effectively slow down the hydrolysis-condensation rate of aluminum precursors, and a self-assembly ordered organic-inorganic composite micelle structure can be induced by gradually increasing the surfactant concentration during the solvent evaporation process.…”