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Tên tài liệu/ đề tài, dự án: Synthesis of silicate sol–gel matrix embedded silver nanostructures: Efficient nanocatalyst for the reduction of 4-nitrophenol
Tác giả/ chủ nhiệm: Shanmugam Manivannan, Bhagavathi Krishnakumari, Ramasamy Ramaraj
Năm xuất bản: 2012
Thời gian đăng: 10/09/2015
Danh mục: Tập 204 - 206
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Thông tin mô tả:

Amine functionalized silicate sol–gel matrix embedded silver nanoparticles (Ag NPs) were prepared in the presence of b-cyclodextrin (b-CD–Ag–TPDT NPs) by a single-step process. The formation of sub-10 nm tetra twinned Ag nanostructures was confirmed by high resolution transmission electron microscopy studies. The reduction of 4-nitrophenol by NaBH4 was used as a model to study the catalytic efficiency of the as prepared Ag nanostructures. The 4-nitrophenol forms an inclusion complex with the hydrophobic b-CD cavity because of the strong affinity of b-CD to the phenyl ring moieties. The catalytic reduction of 4-nitrophenol included in the b-CD cavity by NaBH4 was monitored in the presence of the AgNPs using the absorption spectrophotometer by the kinetic mode analysis. The catalytic performance of the b-CD–Ag–TPDT NPs was greatly enhanced towards the 4-nitrophenol reduction reaction. The tetra twinned shaped b-CD–Ag–TPDT NPs with the size of sub-10 nm showed higher catalytic activity than
the b-CD–Ag NPs and Ag–TPDT NPs.

Từ khóa tìm kiếm: Silver nanoparticles, Silicate sol–gel matrix, b-Cyclodextrin, Catalysis 4-Nitrophenol