A green preparation method of petal-shaped silver nanosheets
A silver nanosheet and petal-shaped technology, applied in the field of preparation of noble metal nanomaterials, can solve the problems of complex preparation process, high energy consumption, and high toxicity of reagents
Active Publication Date: 2022-02-18
江苏汇诚医疗科技有限公司
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However, polyvinylpyrrolidone (PVP) is used as the surfactant and protective agent in most methods of preparing silver nanosheets by means of the soft template method, and sodium borohydride (NaBH 4 ), hydrogen peroxide (H 2 o 2 ) and other chemical reagents to prepare silver nanosheets under high temperature (reflow greater than 100°C) conditions. The reagents used in this method are highly toxic, and the preparation process is complicated and energy consumption is high
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[0028] First, prepare petal-shaped silver nanoflakes:
[0029] Take 11.5 g of alanine dissolved in 1000 mL of water, then adding 3.0 g of polyethylene glycol having a molecular weight of 2000, stirred and dissolved, using thin ammonia water, thin HNO 3 Or the aqueous solution of sodium hydroxide regulates its pH to 5.5, i.e., obtaining a mixed solution A.
[0030] Take 1.699 g of silver nitrate (silver acetate, silver fluorinated silver) in 100 ml of deionized water, configured to concentrate silver nitrate stock B.
[0031] Take 30.0 g of the commercially available tea (can be soaked in a 500 mL deionized water for green tea, yellow tea, white tea, tea, black tea and black tea, and mixtures thereof), heated to 80 ° C, and soak 30 min, natural cooling After the microporous filtration membrane was filtered, the soaked solution was filtered, and the clear tea extract C was obtained.
[0032] Under normal temperature, the stirring speed was 500 rpm, and 100 ml of silver salt solution...
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Abstract
The invention discloses a green preparation method of petal-shaped silver nanosheets, which belongs to the technical field of preparation of noble metal nanomaterials. The preparation method of the petal-shaped silver nanosheets of the present invention is considered from the perspective of green chemistry, and no toxic chemical reagents are used in the preparation process. Using water as a solvent, under normal temperature and pressure conditions, using small molecule organic acid and polyethylene glycol to construct a mixed solution reaction system, using water-soluble silver salt as the silver source, using small molecule polyphenolic compounds and their mixtures in the tea extract as the Reductant green prepared petal-shaped silver nanosheets with controllable shape and size and good uniformity, with a diameter of 400-600 nm and a thickness of less than 80 nm, which has good antibacterial properties. The preparation method of the invention is simple, easy to operate, and has the advantages of low cost, low toxicity, low energy consumption, high yield and the like.
Description
Technical field [0001] The present invention belongs to the preparation of precious metal nanomaterials. Background technique [0002] The silver nanosin belongs to one of the nanomaterials of precious metals (such as gold, silver and platinum, etc.). Due to its unique size and morphology, excellent performance in conductive, optical, antimicrobial, chemical stability, and plasticity, has been widely used in chemical catalysis, inorganic ion detection, surface Raman enhancement, printing, Optoelectronic devices and bioengineering areas. [0003] Green tea, white tea and black tea and other tea contained rich polyphenols, such as catechins, historic tea, no food tea, the table did not eat the tea catechin did not eat acid ester and no food acid, etc., such substances have good Antioxidant activity is also a good green reducing agent, and it is reported to be reported in terms of preparation of silver nankell. [0004] At present, the preparation method of the silver nanof piece re...
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IPC IPC(8): B22F9/24B22F1/054B22F1/068B82Y40/00
CPCB22F9/24B82Y40/00B22F1/0551B22F1/054
Inventor 沈培培沈明张金贵徐沈扬
Owner 江苏汇诚医疗科技有限公司