研究目的
Investigating the photochemical generation of size-controlled gold nanoparticles on pure siliceous ordered mesoporous silica for catalytic applications.
研究成果
The photochemical method developed is fast, simple, and based on water as a solvent, allowing for the production of gold nanoparticles with controlled size and excellent dispersion on SBA-15. The AuNPs@SBA-15 nanocomposite showed promising catalytic performance in the selective oxidation of benzyl alcohol under oxygen atmosphere.
研究不足
The stability of gold nanoparticles in ethanol was found to be poor, and the textural parameters of the nanocomposite were lower than those of the pristine SBA-15 host silica. The catalyst showed a tendency towards coalescence after recycling.
1：Experimental Design and Method Selection:
The study involved a photochemical reduction approach to generate gold nanoparticles on mesoporous silica.
2：Sample Selection and Data Sources:
Ordered mesoporous SBA-15 type material was synthesized and used as support.
3：List of Experimental Equipment and Materials:
Triblock copolymer Pluronic? P-123, tetraethyl orthosilicate (TEOS), gold tribromide (AuBr3), and Irgacure 2959? were used.
4：Experimental Procedures and Operational Workflow:
The SBA-15 support was synthesized, calcined, and then suspended in a solution containing gold bromide and a free radical generator, followed by UV irradiation.
5：Data Analysis Methods:
UV-Visible absorption spectroscopy, TEM, XRD, nitrogen physisorption manometry, thermogravimetric analysis, and XPS were used for characterization.
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