Abstract
Hybridisation of mesoporous organosilicas (MO) to reinforce the surface capability in adsorption and stabilisation of noble metal nanoparticles is of great attention in generating/supporting noble metal within their matrices and transforming them into efficient heterogeneous catalysts. Here, we used a unique hybrid of organic-inorganic mesoporous silica in which pore profile pattern was similar to the well-known mesoporous silica, SBA-15 for catalysis. This hybrid mesoporous organosilica was further engaged as a support in the synthesis and stabilisation of Pd nanoparticles on its surface, and then, the obtained Pd-supported MO was employed as a heterogeneous green catalyst in the conversion of aqueous p-nitrophenol (PNP) to p-aminophenol (PAP) at room temperature with efficient recyclability.
Highlights
Several advantages belong to modified/constructed by organosiloxanes (MO), which cannot be found in conventional hybrid mesoporous silica materials [22]
MOs, depending on the type of bridge, a higher ratio of organosilica can be embedded in the structure of MO, while in the case of conventional mesopores, e.g., SBA-15, it is an overwhelming process to functionalise with organosiloxane precursors in high ratio that usually deals with pore blocking or unsuccessful process [23]
PdPd nanoparticles we further used for immobilisation of nanoparticles
Summary
Nanoporous silicas modified/constructed by organosiloxanes (MO) [1,2,3,4,5] are a class of hybrid silica-based materials that are widely used in the diverse variety of applications including catalysis [6,7], microextraction [8], water treatment [9], molecular recognition [10], photocatalysis [11], optical thermometry [12], sensors [13,14], and CO2 capture [15,16] These materials can be synthesised by condensation of various organosiloxane precursors and usually have amorphous structures but with ordered/disordered pore channels. This efficiency in transfer of molecules improves the lifetional silicas stayactivity on thethrough externalminimizing surface ofthe pore channels, while in MOs, timemesoporous of the MO and catalytic pore-blocking possibility by it canguest be embedded in the pore wall [29]
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