Dynamic adsorption of toluene on amino-functionalized SBA-15 type spherical mesoporous silica

Abstract

Amino-functionalized spherical mesoporous silica (ASMS) materials were successfully prepared via a convenient treatment method by using 3-aminopropyltrimethoxysilane (APTES), which was used in different concentrations in the process of spherical mesoporous silica (SMS) synthesis. The adsorption performances of ASMS were evaluated by taking toluene as a simulated pollutant and the adsorption mechanism was also studied. A variety of characterization methods were adopted, including scanning electron microscopy, small-angle X-ray diffraction and Fourier-transform infrared spectroscopy techniques and nitrogen adsorption-desorption analyses, which led to a better understanding of the performance of the materials. It was found that the SMS has a good adaptability due to the amino functionality, the pore structure still remains in the modified samples even when the mass ratio of APTES/TEOS is up to 3, and the chemical properties of the material surface are significantly improved by the amino functionality. The results show that the capacities of the toluene adsorption follow the order of SMS < ASMS-1 < ASMS-3 < ASMS-2. ASMS-2 has the highest toluene adsorption capacity (98.1 mg g À1 ) and the saturated adsorbent can be easily regenerated by thermal desorption, which has a stable adsorption capacity after 4 adsorption cycles. These experimental data indicated that amino functionalization could affect both the pore structure and surface chemical properties of SMS, making ASMS a promising material for the reduction of industrial volatile organic compound emissions in air treatment.

<p>Superiority of L-tartaric Acid Modified Chiral Mesoporous Silica Nanoparticle as a Drug Carrier: Structure, Wettability, Degradation, Bio-Adhesion and Biocompatibility</p>

“…Since the discovery of M41 S in the early 1990s, mesoporous silica nanoparticles (MSNs) with a pore size ranging from 2 nm to 50 nm have attracted much attention and have served as efficient drug delivery systems for various therapeutic agents. [1][2][3][4][5] Different from the traditional drug carriers such as micelles, organic gels and liposomes, MSNs with inorganic rigid structural framework exhibit chemical inertness, mechanical strength and thermal stability, and could effectively protect their cargo from premature degradation and chemical/biological reactions under rigorous physiological conditions, and can deliver a large amount of cargo in a controlled manner during their transportation in vivo. [6][7][8] As mesoporous materials, their internal nanopores with large surface area and pore volume provide great potential for drug adsorption and loading, while the silanol enriched external surfaces are easily modified with molecular, supramolecular or polymer moieties, and could improve the versatility of carriers.…”

“…1,5,6 Moreover, the tunable nanometersized pore size of MSNs effectively reduce the particle size of cargo and provide better control of drug loading and release kinetics while performing delivery tasks. 1,3,9 A substantial number of studies have reported the applications of MSNs as drug carriers, and the use of MSNs as drug carriers have been proven to be successful in vitro. [6][7][8][10][11][12] To the best of our knowledge, the efficacy of MSN carriers is decided by the structural features which determine the physicochemical properties of MSNs, including shape, size, pore characteristics, and surface chemistry.…”

Toluene Adsorption by Mesoporous Silicas with Different Textural Properties: A Model Study for VOCs Retention and Water Remediation

“…For example, Zhou et al studied amino-functionalized spherical mesoporous silicas as potential toluene adsorbent materials. They found that the modifications of the surface occurring by the amino-functionalization affects both the pore structure and surface properties of siliceous materials, improving their toluene adsorption capacity [ 17 ].…”

Recent Advances in the Preparation and Applications of Organo‐functionalized Porous Materials

“…For example, APTS groups were functionalized over the spherical mesoporous silica for the removal of volatile organic molecules. APTS functionalized materials showed the highest toluene adsorption capacity of 98.1 mg −1 . This high adsorption capacity was attributed to the formation of strong hydrophobic interaction between the APTS groups and the toluene molecule.…”