Abstract
To improve the adsorption performance of carbon dioxide, which is considered the main culprit of greenhouse gases, the specific surface area and high pore volume of the adsorbing material should be considered. For a porous material, the performance of carbon dioxide adsorption is determined by the amine groups supporting capacity; the larger the pore volume, the greater the capacity to support the amine groups. In this study, a double-shell mesoporous hollow silica nanomaterial with excellent pore volume and therefore increased amine support capacity was synthesized. A core–shell structure capable of having a hollow shape was synthesized using polystyrene as a core material, and a double-shell mesoporous shape was synthesized by sequentially using two types of surfactants. The synthesized material was subjected to a sintering process of 600 degrees, and the N2 sorption analysis confirmed a specific surface area of 690 m2/g and a pore volume of 1.012 cm3/g. Thereafter, the amine compound was impregnated into the silica nanomaterial, and then, a carbon dioxide adsorption experiment was conducted, which confirmed that compared to the mesoporous hollow silica nanomaterial synthesized as a single shell, the adsorption performance was improved by about 1.36 times.
Highlights
It was observed that the primary shell of double-shell mesoporous hollow silica (DMHS) forms small pores, and the secondary shell forms large pores; this is because the molecular weight of P123 is larger than that of CTACI, which made relatively large micelles, and it was removed by calcination [28]
The synthesized DMHS was introduced into an amine functional group via astudy, support method tomesoporous have a selectivity
The synthesized DMHS was introduced into an amine functional group via a support method to have a selectivity for CO2 adsorption
Summary
Mesoporous silica has shown the high specific surface area and tremendous porous characteristics compared to other materials, and it is able to introduce various functional groups due to the presence of numerous hydroxyl (-OH) groups on the surface. Owing to these characteristics, mesoporous silica has demonstrated excellent gas adsorption properties [24]. MHS, DMHS were ethanol, respectively, and dispersed by PHMS, stirring atand RT for 30 min.
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