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Green quick method for preparing nano-silver sol using bagasse extract

A nano-silver sol and extractant technology, applied in the nano-field, can solve the problems of low utilization rate, environmental pollution, waste of resources, etc., achieve good stability and dispersion, solve the effect of easy agglomeration, and increase the value of use

Active Publication Date: 2015-09-02
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At the same time, due to the backwardness of transformation and utilization technology, traditionally bagasse is often discarded, or most of it is only used as fuel, and its utilization rate is low, which not only causes waste of resources, but also brings environmental pollution
At present, the use of bagasse extract as a reducing agent and stabilizer to prepare nano-metals has not been reported.

Method used

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  • Green quick method for preparing nano-silver sol using bagasse extract
  • Green quick method for preparing nano-silver sol using bagasse extract
  • Green quick method for preparing nano-silver sol using bagasse extract

Examples

Experimental program
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Effect test

Embodiment 1

[0029] First, under stirring conditions, NaOH solution with a mass concentration of 60 mg / mL was added dropwise to 80 mg / mL AgNO 3 solution until no more precipitation occurred; then 150 mg / mL ammonia water was added dropwise to the AgNO 3 mixed with NaOH until the precipitate is completely dissolved to form a more active [Ag(NH 3 ) 2 ] + state. Soak 0.2 g of bagasse powder in 5% NaOH aqueous solution with a solid-to-liquid ratio of 1:20 (g / mL), extract for 4 h to obtain the extract, and then according to the ratio of bagasse to silver nitrate (2 :3, g / g), add the newly prepared silver ammonia solution, put it in a microwave reactor, adjust the microwave power to 700 W, and the microwave temperature to 60 ℃, and the stable nano-silver sol can be obtained after microwave reaction for 70 min. After the nano-silver sol was centrifuged in a high-speed centrifuge (14000 r / min, 35 min) to precipitate, and then re-dissolved in water, it was still uniformly dispersed and not easy ...

Embodiment 2

[0031] First, under stirring conditions, NaOH solution with a mass concentration of 100 mg / mL was added dropwise to 60 mg / mL AgNO 3 solution until no more precipitation occurred; then 300 mg / mL ammonia water was added dropwise to the AgNO 3 mixed with NaOH until the precipitate is completely dissolved to form a more active [Ag(NH 3 ) 2 ] + state. Soak 0.2 g of bagasse powder in NaOH aqueous solution with a mass fraction of 4%, with a solid-to-liquid ratio of 1:23 (g / mL), extract for 5 h to obtain the extract, and then according to the ratio of bagasse to silver nitrate (1 :1, g / g), add the newly prepared silver ammonia solution, place it in a microwave reactor, adjust the microwave power to 900 W, and the microwave temperature to 80 °C, and the stable nano-silver sol can be obtained after microwave reaction for 30 min. After the nano-silver sol was centrifuged in a high-speed centrifuge (13000 r / min, 40 min) to precipitate, and then re-dissolved in water, it was still unif...

Embodiment 3

[0033] First, under stirring conditions, NaOH solution with a mass concentration of 150 mg / mL was added dropwise to 120 mg / mL AgNO 3 solution until no more precipitation occurred; then 800 mg / mL ammonia water was added dropwise to the AgNO 3 mixed with NaOH until the precipitate is completely dissolved to form a more active [Ag(NH 3 ) 2 ] +state. Soak 0.2 g of bagasse powder in NaOH aqueous solution with a mass fraction of 3%, with a solid-to-liquid ratio of 1:25 (g / mL), extract for 3 h to obtain the extract, and then according to the ratio of bagasse to silver nitrate (2 : 1, g / g), add the newly prepared silver ammonia solution, put it in the microwave reactor, adjust the microwave power to 800 W, and the microwave temperature to 70 ℃, and the stable nano-silver sol can be obtained after microwave reaction for 50 min. After the nano-silver sol was centrifuged in a high-speed centrifuge (15000 r / min, 30 min) to precipitate, and then re-dissolved in water, it was still unif...

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Abstract

The invention discloses a green quick method for preparing nano-silver sol using a bagasse extract. The method is that, in a water phase system, a bagasse extract and a silver-ammonia solution are added in a microwave reactor to be subjected to a redox reaction, and then nano-silver particles uniformly dispersed and being good in stability can be obtained. The method totally accords with the idea of "green chemistry", so the method is a green, environmental friendly, and quick method for preparing nano-metal. Bagass is a by-product in the sugar industry and also a renewable biomass resource, the method provides a new idea for synthesis of nano-metal, and technological guidance on bagasse utilization with a high value. The nano-silver sol prepared by the green method has a great application prospect in fields of medical treatment, biology and foodstuff.

Description

technical field [0001] The invention belongs to the field of nanotechnology, and in particular relates to a green and rapid method for preparing nano-silver sol from bagasse extract. Background technique [0002] Silver nanoparticles (AgNPs) are one of the most widely used nano-products, with many properties, such as antibacterial, reducing, oxidizing, catalytic, etc., especially the antibacterial technology is relatively mature. At present, AgNPs are mainly used in the electronics industry, biosensing, clothing, food industry, coatings, sunscreens, cosmetics, medical equipment, plastics, and textiles. The most commonly used preparation method of AgNPs is the chemical reduction method, but using this method to prepare AgNPs requires the use of chemical reagents such as hydrazine hydrate and sodium borohydride, which will have a negative impact on the environment. At the same time, the chemical reagents remaining on the surface of AgNPs are difficult to remove. To a large ex...

Claims

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Application Information

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IPC IPC(8): B22F9/24B82Y40/00
Inventor 王小英沈祖广孙润仓郭滨照
Owner SOUTH CHINA UNIV OF TECH
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