Method for preparing rodlike ultrafine silver powder by carrying out chemical silvering on surfaces of attapulgite nanofibers

A surface chemical and nanofiber technology, applied in the field of chemical plating, can solve the problems of low added value and achieve the effects of low cost, consumption saving and low density

Inactive Publication Date: 2011-05-25
HUAIYIN INSTITUTE OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] At present, most of the research work on attapulgite focuses on improving its adsorption performance, such as preparing water-absorbing agents and other products, with low added value.

Method used

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  • Method for preparing rodlike ultrafine silver powder by carrying out chemical silvering on surfaces of attapulgite nanofibers
  • Method for preparing rodlike ultrafine silver powder by carrying out chemical silvering on surfaces of attapulgite nanofibers
  • Method for preparing rodlike ultrafine silver powder by carrying out chemical silvering on surfaces of attapulgite nanofibers

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Embodiment 1: Prepare one-dimensional rod-shaped ultrafine silver powder according to the following steps:

[0020] (1) Add 10 g of attapulgite raw soil to 500 ml of 20% hydrochloric acid for soaking, mechanically stir for 8 hours, centrifuge, wash with deionized water, and set aside;

[0021] (2) Take the attapulgite obtained in step (1) and add 800ml of 1g / L AgNO 3 Soak in the solution for adsorption, mechanically stir for 3 hours at room temperature, centrifuge, wash with deionized water, and set aside;

[0022] (3) Add the attapulgite obtained in step (2) into 800 ml of 10% formaldehyde solution with a mass concentration, adjust the pH value to 10.5 with 1 mol / L NaOH, mechanically stir for 2 hours at room temperature, centrifuge, wash with deionized water, and set aside;

[0023] (4) Take the attapulgite obtained in step (3) and add it to 5000ml of electroless silver plating solution, mechanically stir it in a water bath at 30°C for 40min, after the plating finishe...

Embodiment 2

[0024] Embodiment 2: Prepare one-dimensional rod-shaped ultrafine silver powder according to the following steps:

[0025] (1) Add 5 g of attapulgite raw soil to 250 ml of 15% hydrochloric acid for soaking, mechanically stir for 8 hours, centrifuge, wash with deionized water, and set aside;

[0026] (2) Take the attapulgite obtained in step (1) and add 400ml of 6.5g / L AgNO 3 Soak in the solution for adsorption, mechanically stir for 3 hours at room temperature, centrifuge, wash with deionized water, and set aside;

[0027] (3) Add the attapulgite obtained in step (2) into 400ml of formaldehyde solution with a mass concentration of 12%, adjust the pH value to 10 with 1mol / L NaOH, mechanically stir for 2h at room temperature, centrifuge, wash with deionized water, and set aside;

[0028] (4) Take the attapulgite obtained in step (3) and add it to 2500ml of electroless silver plating solution, mechanically stir it in a water bath at 30°C for 40min, after the plating finishes, ce...

Embodiment 3

[0029] Embodiment 3: Prepare one-dimensional rod-shaped ultrafine silver powder according to the following steps:

[0030] (1) Add 10 g of attapulgite raw soil to 500 ml of 10% hydrochloric acid for soaking, mechanically stir for 8 hours, centrifuge, wash with deionized water, and set aside;

[0031] (2) Take the attapulgite obtained in step (1) and add 800ml of 10g / L AgNO 3 Soak in the solution for adsorption, mechanically stir for 3 hours at room temperature, centrifuge, wash with deionized water, and set aside;

[0032] (3) Add the attapulgite obtained in step (2) into 800 ml of 1% formaldehyde solution with mass concentration, adjust the pH value to 11 with 1mol / L NaOH, mechanically stir for 2 hours at room temperature, centrifuge, wash with deionized water, and set aside;

[0033] (4) Take the attapulgite obtained in step (3) and add it to 5000ml of electroless silver plating solution, mechanically stir it in a water bath at 30°C for 40min, after the plating finishes, ce...

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Abstract

The invention discloses a method for preparing rodlike ultrafine silver powder by carrying out chemical silvering on surfaces of attapulgite nanofibers, and the method comprises the following steps: firstly, acidizing the natural soils of attapulgite by using a hydrochloric acid solution; then, carrying out oxidant-solution soaking and adsorption on the acidized attapulgite by using a silver nitrate solution; then, carrying out reduction activation treatment on the attapulgite subjected to adsorption; and finally, carrying out chemical silvering on the surface of the attapulgite subjected to reduction activation so as to obtain unidimensional rodlike ultrafine silver powder. The method provided by the invention has the advantages that a metal coating prepared by using the method is small in density, low in cost and complete in metal cladding, and has a rodlike nano structure, thereby creating a new field for the development and application of attapulgite, and improving the economic value added of attapulgite.

Description

technical field [0001] The invention belongs to the field of chemical plating, and in particular relates to a method for preparing rod-shaped ultrafine silver powder by chemical silver plating on the surface of attapulgite nanofibers. Background technique [0002] Attapulgite clay (hereinafter referred to as attapulgite) is a layer chain structure of water-containing magnesium-aluminosilicate clay minerals, the ideal molecular formula is: Mg 5 Si 8 o 20 (OH) 2 (OH 2 ) 4 4H 2 O, the theoretical chemical composition is: SiO 2 56.96%; (Mg, Al, Fe)O 23.83%; H 2 O 19.21%. The microstructural characteristics of attapulgite powder have been recognized by people. It is composed of rod crystals with a length of 0.1-1 μm and a width (diameter) of 15-20nm; The difference is mainly reflected in the aspect ratio of the rod crystal. [0003] Under normal circumstances, attapulgite, as a powder material, is difficult to exist in the state of dispersed independent rod crystals, bu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D06M11/83
Inventor 周苏闽王红艳张强华汪玉祥陈静蒋金龙程晓春黄玮
Owner HUAIYIN INSTITUTE OF TECHNOLOGY
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