Optimization of surface silanol groups in mesoporous SBA-15 and KIT-6 materials: Effects on APTES functionalization and CO2 adsorption

IF 4.8 3区材料科学 Q1 CHEMISTRY, APPLIED

Microporous and Mesoporous Materials Pub Date : 2024-10-24 DOI:10.1016/j.micromeso.2024.113394

Analía Natalí Arias , Ana Laura Páez Jerez , Álvaro Yamil Tesio , Melisa Romina Serrano , Norberto Alejandro Bonini , Mónica Liliana Parentis

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Abstract

Hybrid mesoporous silicas are potentially reusable promising adsorbents for CO₂ capture. Here SBA-15 and KIT-6 mesoporous silicas were synthetized by the sol-gel technique using a lower calcination temperature than the conventional one: 300 °C vs. 550 °C. This strategy aimed to maximize the surface hydroxyl group density and consequently, to improve functionalizing agent-loading performed by the post-synthesis grafting method. The as-obtained silica-based samples were then characterized and applied to CO₂ capture. A correlation between chemical-textural properties and adsorption capacities of pure and modified materials was discussed. The calcined at 300 °C silica supports, SBA-15-300-1 and KIT-6-300-1, with high silanol group densities showed better adsorption capacities overall pressure range. It is worth highlighting that the KIT-6-300-1: APTES adsorbent had a good stability performance, showing a drop of around 8 % over the aging time of a year. While, the SBA-15-300-1: APTES solid presented an excellent recycled performance after 10 adsorption-desorption cycles, maintaining about 95 % of its initial capacity.

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优化介孔 SBA-15 和 KIT-6 材料中的表面硅醇基团：对 APTES 功能化和二氧化碳吸附的影响

混合介孔硅是一种可重复使用的二氧化碳捕集吸附剂。本文采用溶胶-凝胶技术合成了 SBA-15 和 KIT-6 介孔硅，煅烧温度低于传统方法：300 °C 对 550 °C。这种策略的目的是最大限度地提高表面羟基密度，从而提高合成后接枝法的官能化剂载量。获得的硅基样品随后被表征并应用于二氧化碳捕获。讨论了纯材料和改性材料的化学纹理特性与吸附能力之间的相关性。在 300 °C 煅烧的二氧化硅支撑物 SBA-15-300-1 和 KIT-6-300-1 具有较高的硅醇基密度，在整个压力范围内显示出较好的吸附能力。值得强调的是，KIT-6-300-1：APTES 吸附剂具有良好的稳定性，在一年的老化时间内，吸附量下降了约 8%。而 SBA-1500-300-1：APTES 固体在经过 10 次吸附-解吸循环后表现出了极佳的再循环性能，保持了约 95% 的初始容量。

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来源期刊

Microporous and Mesoporous Materials 化学-材料科学：综合

CiteScore

10.70

自引率

5.80%

发文量

649

审稿时长

26 days

期刊介绍： Microporous and Mesoporous Materials covers novel and significant aspects of porous solids classified as either microporous (pore size up to 2 nm) or mesoporous (pore size 2 to 50 nm). The porosity should have a specific impact on the material properties or application. Typical examples are zeolites and zeolite-like materials, pillared materials, clathrasils and clathrates, carbon molecular sieves, ordered mesoporous materials, organic/inorganic porous hybrid materials, or porous metal oxides. Both natural and synthetic porous materials are within the scope of the journal. Topics which are particularly of interest include: All aspects of natural microporous and mesoporous solids The synthesis of crystalline or amorphous porous materials The physico-chemical characterization of microporous and mesoporous solids, especially spectroscopic and microscopic The modification of microporous and mesoporous solids, for example by ion exchange or solid-state reactions All topics related to diffusion of mobile species in the pores of microporous and mesoporous materials Adsorption (and other separation techniques) using microporous or mesoporous adsorbents Catalysis by microporous and mesoporous materials Host/guest interactions Theoretical chemistry and modelling of host/guest interactions All topics related to the application of microporous and mesoporous materials in industrial catalysis, separation technology, environmental protection, electrochemistry, membranes, sensors, optical devices, etc.