Hydrothermal carbon sphere for supporting nanosilver by using one-step method and preparation method and application of hydrothermal carbon sphere

A technology of nano-silver and hydrothermal carbon, which is applied in the direction of botany equipment and methods, applications, and preservation of fruits and vegetables, and can solve problems such as poor adhesion, easy agglomeration and instability of nano-silver

Inactive Publication Date: 2019-07-12
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the higher surface energy makes nano-silver have two sides, which improves the reactivity of nano-silver on the one hand, and reduces the stability of nano-silver on the other hand.
Moreover, during the application process, nano-silver is easy to agglomerate, easy to oxidize, unstable, poor in adhesion, and the release rate is too fast.

Method used

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  • Hydrothermal carbon sphere for supporting nanosilver by using one-step method and preparation method and application of hydrothermal carbon sphere
  • Hydrothermal carbon sphere for supporting nanosilver by using one-step method and preparation method and application of hydrothermal carbon sphere
  • Hydrothermal carbon sphere for supporting nanosilver by using one-step method and preparation method and application of hydrothermal carbon sphere

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] After the freshly collected corn stalks were dried, the leaves and roots were removed, and the hydrothermal carbon spheres loaded with nano-silver were prepared according to the following steps:

[0035] (1) Grinding corn stalks and ball milling pretreatment, the adjustable speed ball mill is MITR-YXQM-1L planetary ball mill, the pretreatment conditions are: the pulverizer grinds the raw material to 40 mesh, the ball mill speed is 220rpm, and the ball milling time is 8h to obtain particles shaped corn stalks;

[0036] (2) Dissolving the corn stalk particles in the sodium hydroxide / urea system, the mass ratio of sodium hydroxide, urea and water in the sodium hydroxide / urea system is 5:10:85, the volume of the sodium hydroxide / urea system 100mL, the dissolution conditions are: temperature -15°C, time 4h, dosage of corn stalks 0.5g;

[0037] (3) Add the prepared silver-ammonia solution dropwise into the solution dissolved in the above step (2), and mix evenly. The additio...

Embodiment 2

[0041] The freshly collected wheat straw raw materials were dried, leaves and roots removed, and the hydrothermal carbon spheres loaded with nano-silver were prepared according to the following steps:

[0042] (1) Grinding and ball milling the wheat straw for pretreatment. The adjustable speed ball mill is MITR-YXQM-1L planetary ball mill. The pretreatment conditions are: the pulverizer grinds the raw material to 40 mesh, the speed of the ball mill is 220rpm, and the ball milling time is 8h to obtain particles. shaped wheat straw;

[0043] (2) Dissolve the particles in the sodium hydroxide / urea system, the mass ratio of sodium hydroxide, urea and water in the sodium hydroxide / urea system is 5:10:85, and the volume of the sodium hydroxide / urea system is 100mL , the dissolution conditions are: temperature -15°C, time 4h, dosage of wheat straw granules 0.5g;

[0044] (3) Add the prepared silver-ammonia solution dropwise into the solution dissolved in the above step (2), and mix ...

Embodiment 3

[0048] After the freshly collected bagasse was dried to remove impurities such as dust, the hydrothermal carbon spheres loaded with nano-silver were prepared according to the following steps:

[0049] (1) The bagasse is pulverized and pretreated by ball milling. The adjustable speed ball mill is MITR-YXQM-1L planetary ball mill. The pretreatment conditions are: the pulverizer pulverizes the raw material to 50 mesh, the ball mill speed is 210rpm, and the ball milling time is 9h to obtain granular bagasse;

[0050] (2) Dissolving the particles in the sodium hydroxide / urea system, the mass ratio of sodium hydroxide, urea and water in the sodium hydroxide / urea system is 6:11:83, the volume of the sodium hydroxide / urea system is 110mL, The dissolution conditions are: temperature -15°C, time 5h, bagasse granule dosage 1g;

[0051] (3) Add the prepared silver-ammonia solution dropwise into the solution dissolved in the above step (2), and mix evenly. The addition conditions of the s...

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Abstract

The invention relates to hydrothermal carbon spheres for supporting nanosilver by using a one-step method and a preparation method and application of the hydrothermal carbon spheres. The preparation method comprises the following steps: removing impurities from whole collected biomass components, washing, drying, preparing fine granules under the external mechanical actions of a crushing machine and a ball mill, dissolving the whole biomass components into a sodium hydroxide / urea system, after the solution is dissolved, dropping a prepared silver ammonia solution, uniformly mixing, pouring theuniformly mixed solution into a high-temperature high-pressure reaction kettle, carrying out a hydrothermal reaction, and after the hydrothermal reaction is completed, carrying out centrifugation, washing, ultrasonic treatment, centrifugation and freeze drying on the solution, thereby obtaining the nanosilver supported hydrothermal carbon spheres finally. By adopting the hydrothermal carbon spheres, the defects that nanosilver is liable to aggregate, instable and too rapid in leakage can be alleviated, the application range of the hydrothermal carbon spheres as a nanosilver carrier is widened, and whole biomass components such as agriculture and forestry biomass wastes can be sufficiently utilized.

Description

technical field [0001] The invention relates to the field of utilization of all components of biomass, in particular to a hydrothermal carbon sphere loaded with nano-silver in a one-step method and a preparation method and application thereof. Background technique [0002] Nano-silver refers to the simple metal silver whose particle size is at the nanometer level. The particle size of common nano-silver is mostly around 25nm. It has broad-spectrum bactericidal characteristics, and has a strong inhibitory and killing effect on dozens of pathogenic microorganisms such as Escherichia coli, Neisseria gonorrhoeae, and Chlamydia trachomatis. The generation of drug resistance makes it have a very important position in the field of fresh-keeping and antibacterial of food and fruit. However, the higher surface energy makes nano-silver have two sides, which improves the reactivity of nano-silver on the one hand, and reduces the stability of nano-silver on the other hand. And in the ...

Claims

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Application Information

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IPC IPC(8): A01N59/16A01N25/08A01P1/00A01P3/00A23B7/153A23L3/3454
CPCA01N25/08A01N59/16A23B7/153A23L3/3454A23V2002/00A23V2200/10
Inventor 王小英蒋启蒙孙润仓熊雨桐
Owner SOUTH CHINA UNIV OF TECH
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