Introduction of Bridging and Pendant Organic Groups into Mesoporous Alumina Materials

Abstract

Incorporation of organic functionalities into soft-templated mesoporous alumina was performed via organosilane-assisted evaporation induced self-assembly using aluminum alkoxide precursors and block copolymer templates. This strategy permits one to obtain mesoporous alumina-based materials with tailorable adsorption, surface and structural properties. Isocyanurate, ethane, mercaptopropyl, and ureidopropyl-functionalized mesoporous alumina materials were synthesized with relatively high surface area and large pore volume with uniform and wormhole-like mesopores. The presence of organosilyl groups within these hybrid materials was confirmed by IR or Raman spectroscopy and their concentration was determined by elemental analysis.

Mesoporous isocyanurate-containing organosilica–alumina composites and their thermal treatment in nitrogen for carbon dioxide sorption at elevated temperatures

“…Incorporation of organic bridging groups into a framework is used to achieve the desired chemical properties of nanomaterials for various applications such as adsorption, chemical sensing, chromatography, drug delivery, nonlinear optics, redox catalysis, immobilization of biomolecules, and so forth. [4][5][6][7][8][9] There are two major strategies for the synthesis of organosilicas: one of them is the postsynthesis graing and the other one is co-condensation (onepot synthesis). [10][11][12][13] The post-synthesis graing involves reaction of template-free or template-containing siliceous mesostructures with alkoxy organosilanes leading to the covalent attachment of the desired organic groups.…”

Fast Synthesis and Size Control of Gibbsite Nanoplatelets, Their Pseudomorphic Dehydroxylation, and Efficient Dye Adsorption

“…The synthesis of gibbsite (γ-Al(OH) 3 ) nanoparticles is of particular interest due to their numerous applicability as adsorbent, , fire-retardant, polishing agent in toothpaste, filler in paper manufacturing, adjuvant for formulation of vaccine, and as model system for the study of liquid crystal dynamics in the case of colloidal gibbsite nanoplatelets. − Moreover, gibbsite is a universal starting material for the fabrication of all alumina phases, in their turn having a wide range of applications, , and since gibbsite-alumina transformation is pseudomorphic (i.e., the initial shape of gibbsite is kept), , controlled synthesis of gibbsite particles to predetermined shapes and sizes theoretically lead to a controlled-shape/size synthesis of alumina particles in all phases.…”

Neutralization-mediated extraction of amphiphilic organic molecules for obtaining high-quality mesoporous alumina

“…A wide range of methods, including extraction using organic solvent with an appropriate acid, have so far been developed for removing amphiphilic organic molecules. [17][18][19][20][21][22][23][24][25][26][27][28][29][30][31][32][33][34][35][36] Such a solvent extraction process is restricted to the case of ordered mesoporous silica. [17][18][19][20][21][22] Most studies have focused on enhancing the removal degree and recyclability of amphiphilic organic molecules using a wide range of solvents and oxidants.…”

“…[17][18][19][20][21][22] Most studies have focused on enhancing the removal degree and recyclability of amphiphilic organic molecules using a wide range of solvents and oxidants. [17][18][19] Compared to the case of silica-based mesoporous materials, relatively few attempts of solvent extraction have been made on ordered mesoporous alumina [23][24][25] as well as other non-silicabased materials [26][27][28][29][30][31][32][33][34][35][36][37] such as titania, [29][30][31] niobia, 32 tin oxide, 33 iron oxide, 34,35 and tungsten oxide. 36 Among the diverse range of compositions, alumina has attracted especially considerable attention in the research fields of catalysts and adsorbents, [2][3][4][5][6][7][8][9][10][11][12][13][14][15] but with insufficiently high degrees of extraction...…”

“…36 Among the diverse range of compositions, alumina has attracted especially considerable attention in the research fields of catalysts and adsorbents, [2][3][4][5][6][7][8][9][10][11][12][13][14][15] but with insufficiently high degrees of extraction of the organic template. [23][24][25][26] A Soxhlet extraction accomplished by refluxing in ethanol (EtOH) was applied for removing amphiphilic organic molecules from a mesostructured precursor of mesoporous alumina prepared with amines (e.g., triethanolamine). 23,24 The carbon content was decreased from B20 wt% to B6 wt% (72% removal) over the course of the extraction process.…”