SO₂ Capture and Detection by SBA-15 and Amine-Functionalized SBA-15

Abstract

An exploration of the SO 2 adsorption properties, of two distinct mesoporous materials, classic hydroxy-functionalized SBA-15 and amino-functionalized SBA-15, shows remarkable SO 2 adsorption properties, with total uptakes of 4.43 and 4.19 mmol g −1 at 298 K and 1 bar, respectively. Furthermore, the amino-functionalization increases the SO 2 adsorption at low pressure. Relatively weak SO 2 interactions via physisorption processes in both materials were corroborated by calculating the heat of adsorption for SO 2 . Then, photoluminescence experiments demonstrated the outstanding properties of SBA-15 for selective SO 2 detection. A higher packing of the SO 2 molecules within the pores of the materials was the driving force for the change in fluorescence. Finally, the time-resolved photoluminescence decay experiments provide insights into the intricate host-to-guest energy transfer mechanisms intrinsic to these materials. This research not only advances our knowledge of SO 2 adsorption mechanisms but also underscores the potential applications of SBA-15 materials in gas sensing and environmental monitoring, which are crucial in various industries.

APTES functionalization in SBA-15: the effect on SO2 capture and detection applications

“…10 In fact, the effect of silicate modification on SO 2 adsorption has been studied, showing that the capture performance of amine-modified silicates is significantly higher than that of silicates modified with metals. 11 It may be related to the basic character of the amine. It has even been reported that optimally increasing the amount of amine positively affects the adsorbent performance.…”