Synthesis and Spectral Properties of Ag/SiO2-Al2O3 Composite Nanomaterial Based on Molecular Sieve Template

doi:10.7503/cjcu20210304

Abstract

Abstract:

Ag nanoparticles with SiO₂-Al₂O₃ amorphous structure as the protective layer have important applications in the field of sterilization and catalysis. The morphology control of Ag nanoparticles is a privotal guarantee for its excellent performance， especially the synthesis of Ag nanoparticles with regular structures has always been a difficulty in this field. In this paper， the metastable structure of SiO₂-Al₂O₃ molecular sieve was used as the template， and the ion exchange method is adopted at room temperature. The ion exchange time was adjusted to control the distribution and content of Ag in the molecular sieve. In the presence of reducing agent N（C₂H₅）₃， amorphous composite structure materials with different ratios of Ag/SiO₂-Al₂O₃ were obtained by microwave reduction reaction. The reslults of transmission electron microscopy showed that small-sized Ag nanoparticles can be distributed in the amorphous SiO₂-Al₂O₃ matrix after different proportions of precursors were reduced by microwave method. The Ag nanoparticles showed necklace-like structure and were linked and wrapped by an amorphous SiO₂-Al₂O₃ lamella when the proportion of silver was increased. This type of structure not only has the catalytic performance of Ag nanoparticles， but also shows good stability under the protection of the SiO₂-Al₂O₃ lamella. It has a wide range of application prospects in the sterilization and catalysis fields.

Key words: Ag nanoparticles, SiO₂-Al₂O₃ undefined structure, Molecular sieve, Microwave reduction

CLC Number:

O614

TrendMD:

WANG Yong, DONG Biao, SUN Jiao, DONG Delu, SUN Liankun. Synthesis and Spectral Properties of Ag/SiO₂-Al₂O₃ Composite Nanomaterial Based on Molecular Sieve Template[J]. Chem. J. Chinese Universities, 2021, 42(10): 3233.

Figures/Tables 6

References 24

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Synthesis and Spectral Properties of Ag/SiO₂-Al₂O₃ Composite Nanomaterial Based on Molecular Sieve Template

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