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Green synthetic method of one-dimensional core-shell type nano silver/attapulgite clay composite material

A composite material and green synthesis technology, applied in the field of utilization of natural mineral resources attapulgite clay (hereinafter referred to as attapulgite), can solve the problems of heavy environmental pollution, strong toxicity of reagents, cumbersome methods, etc., and achieve a simple and economical synthesis system The amount of silver used to overcome the effect of easy agglomeration and uneven dispersion

Inactive Publication Date: 2015-02-11
HUAIYIN INSTITUTE OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Electroplating and electroless plating are traditional methods for preparing metal core-shell composites, but both have disadvantages such as complicated methods, strong toxicity of reagents, and heavy environmental pollution.

Method used

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  • Green synthetic method of one-dimensional core-shell type nano silver/attapulgite clay composite material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Embodiment 1: Synthesize one-dimensional core-shell type nano-silver / attapulgite composite powder according to the following specific steps:

[0018] ① Pre-treatment of attapulgite: pass attapulgite through a 200-mesh sieve, heat activate at 150°C for 2 hours, and wash with water until neutral;

[0019] ②Impregnation and adsorption of attapulgite: add the attapulgite obtained in ① into 0.1mmol / L silver nitrate solution, stir, impregnate and adsorb overnight, and centrifuge to obtain attapulgite paste;

[0020] ③Silver loading on attapulgite: heat and melt agar gel, add agar, silver nitrate and attapulgite paste in water to form a reaction system, then add sodium carbonate to adjust the reaction system to be weakly alkaline, control the reaction temperature and time, and obtain slurry Material; in the reaction system: agar mass concentration 0.1%, attapulgite mass concentration 0.05%, silver nitrate concentration 0.05mmol, 8000rpm beating 15min, reaction temperature 30 ℃...

Embodiment 2

[0022] Embodiment 2: Synthesize one-dimensional core-shell type nano-silver / attapulgite composite powder according to the following specific steps:

[0023] ① Pre-treatment of attapulgite: Pass attapulgite through a 200-mesh sieve, activate with 1N hydrochloric acid for 2 hours, and wash with water until neutral;

[0024] ②Impregnation and adsorption of attapulgite: add the attapulgite obtained in ① into a 0.3mmol / L silver nitrate solution, stir, impregnate and adsorb overnight, and centrifuge to obtain attapulgite paste;

[0025] ③Silver loading on attapulgite: heat and melt agar gel, add agar, silver nitrate and attapulgite paste in water to form a reaction system, then add sodium carbonate to adjust the reaction system to be weakly alkaline, control the reaction temperature and time, and obtain slurry Material; in the reaction system: agar mass concentration 0.2%, attapulgite mass concentration 0.275%, silver nitrate concentration 0.1mmol, 9000rpm beating 12.5min, reaction ...

Embodiment 3

[0027] Embodiment 3: Synthesize one-dimensional core-shell type nano-silver / attapulgite composite powder according to the following specific steps:

[0028] ① Pre-treatment of attapulgite: Pass attapulgite through a 200-mesh sieve, activate with 1N hydrochloric acid for 2 hours, and wash with water until neutral;

[0029] ② Attapulgite impregnation and adsorption: Add the attapulgite obtained in ① into a 0.5 mmol / L silver nitrate solution, stir, impregnate and adsorb overnight, and centrifuge to obtain attapulgite paste;

[0030] ③Silver loading on attapulgite: heat and melt agar gel, add agar, silver nitrate and attapulgite paste in water to form a reaction system, then add sodium carbonate to adjust the reaction system to be weakly alkaline, control the reaction temperature and time, and obtain slurry In the reaction system: the mass concentration of agar is 0.3%, the mass concentration of attapulgite is 0.5%, the concentration of silver nitrate is 0.15mmol, the beating is p...

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Abstract

The invention discloses a green synthetic method for a one-dimensional core-shell nano silver / attapulgite clay composite material. The synthetic method comprises the following steps: forming a reaction system through water, agar, silver nitrate and attapulgite clay, adjusting the reaction system to be alkalescent through sodium carbonate, and controlling reaction temperature and time, so as to obtain a core-shell structure nano silver / attapulgite clay composite material. In the reaction system, the mass concentration of agar reaches 0.1 to 0.3 percent, the mass concentration of the attapulgite clay reaches 0.05 to 0.5 percent, the concentration of silver nitrate ranges from 0.05 to 0.15 mmol, pulping at the speed of 8000 to 10,000 rpm lasts for 10 to 15 min, the reaction temperature ranges from 30 to 60 DEG C, the reaction time lasts for 6 to 24 h, and the pH value ranges from 8 to 9. According to the invention, by controlling the speed of producing reduction monosaccharide through agar homogeneous phase hydration, homogeneous phase reduced coating and controllable growth of silver nitrate, on the surface of the attapulgite clay, can be controlled, and effective acquisition of high dispersion nano silver / attapulgite clay composite material can be ensured through the superior dispersion protectiveness of agar sol solution.

Description

technical field [0001] The invention belongs to the technical field of utilization of natural mineral resources attapulgite clay (hereinafter referred to as attapulgite), and specifically relates to a green synthesis method of a one-dimensional core-shell nano-silver / attapulgite composite material. Background technique [0002] Core-shell nano-silver powder can not only overcome the disadvantages of easy aggregation and uneven dispersion of nano-silver, but also greatly save the amount of silver used and expand the application field of nano-silver. Therefore, it has attracted extensive attention from domestic and foreign science and technology industries. Attapulgite is a natural one-dimensional nanomaterial, which has the characteristics of high aspect ratio, large specific surface area and high chemical stability, and is an excellent carrier of nano silver. Electroplating and electroless plating are traditional methods for preparing metal core-shell composites, but both ha...

Claims

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Application Information

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IPC IPC(8): B22F9/24
Inventor 陈静周巍刘洪金叶玲丁师杰周苏闽
Owner HUAIYIN INSTITUTE OF TECHNOLOGY