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Method for loading nano silvery on activated carbon fibre

A technology of activated carbon fiber and nano-silver, which is applied in chemical instruments and methods, and other chemical processes, can solve the problems of long preparation time, nano-silver falling off, and large silver consumption, and achieves remarkable antibacterial effect, good product stability, The effect of less silver consumption

Inactive Publication Date: 2009-03-18
INST OF PROCESS ENG CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The preparation of nano-silver-activated carbon fiber composite material generally utilizes the adsorption capacity of activated carbon fiber and the reduction characteristics of its surface groups, and adopts impregnation-reduction method (such as Chinese patent CN1376822) or impregnation-calcination method (such as Chinese patent CN1789498) to carry out silver Immobilization, these methods have long preparation time, large consumption of silver, uneven distribution of nano-silver particle size, unstable product quality, and the combination between nano-silver prepared by spontaneous adsorption-reduction and activated carbon fiber is not strong enough, and there is a tendency for nano-silver to fall off. Dangerous, limited use in healthcare

Method used

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  • Method for loading nano silvery on activated carbon fibre

Examples

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Effect test

Embodiment 1

[0018] Use polyacrylonitrile-based activated carbon fiber, cut into a rectangle of 1cm × 2cm, connect a silver wire as a wire, soak it in 6.0mmol / L silver nitrate solution and use it as a cathode, and use a conductive graphite sheet of 10cm × 10cm as the anode. The electrode is placed in the electrolytic cell, the electrolyte contains 6.0mmol / L silver nitrate and 0.1mmol / L sodium citrate, the control current is 0.3mA, and the duration is 20 seconds. After the electrolysis is completed, the electrolyte in the activated carbon fiber is squeezed dry, then washed 5 times with deionized water, and dried in an oven at 50° C. to obtain activated carbon fibers loaded with nano-silver. Observed by an electron microscope, the particle size of the nano-silver is 30-50nm. Experimental results prove that the activated carbon fiber can effectively absorb impurities in tap water, kill Escherichia coli, and significantly improve water quality.

Embodiment 2

[0020] Use viscose-based activated carbon fiber, cut it into a 10cm×10cm square, connect a silver wire as a wire, soak it in 0.1mmol / L silver nitrate solution and use it as a cathode, and use a 10cm×10cm porous silver plate as the anode, connect the two electrodes Place in an electrolytic cell, the electrolyte contains 0.1mmol / L silver nitrate and 0.1mol / L potassium nitrate, the control current is 10mA, and the duration is 10 seconds. After the electrolysis is completed, the electrolyte in the activated carbon fiber is squeezed dry, then washed 5 times with ultrapure water, and dried naturally at room temperature to obtain the activated carbon fiber loaded with nano-silver. Using an electron microscope to observe, the nano-silver particle size is about 10nm, and the distribution is uniform. Experimental results prove that the activated carbon fiber can effectively kill more than 99.99% of Escherichia coli and more than 99% of Staphylococcus aureus, Candida albicans and other p...

Embodiment 3

[0022] Use phenolic-based activated carbon fiber, cut it into a rectangle of 1.0m×5.0m, clamp a silver bar on the wide side as a wire, soak it in a 50mmol / L silver nitrate solution and use it as a cathode, and use the same type of carbon nanofiber of 1.0m×5.0m as the anode. The two electrodes are placed in an electrolytic cell, the electrolyte contains 50mmol / L silver nitrate, the control current is 15A, and the duration is 120 seconds. After the electrolysis is completed, take out the cathode activated carbon fiber, dry the electrolyte in it, wash it with deionized water for 5 times, and dry it with hot air at 60-80°C to obtain the activated carbon fiber loaded with nano-silver. Electron microscope observation shows that the nano-silver particle size is 50-80nm. Experimental results prove that the activated carbon fiber material can effectively absorb and kill pathogenic bacteria in water, and the activated carbon fiber is rolled into a column for drinking water purification....

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Abstract

The invention designs a method for loading nano-silver on active carbon fiber through an electrochemical deposition method. In the method, a silver ion is absorbed by the absorption capacity of active carbon fiber, and is reduced to silver element by a cathodic reduction method; and nano-silver is directly fixed on the surface of the active carbon fiber while the nano-silver is generated by controlling operation condition. The method is applicable to various conductive active carbon fiber materials with fast preparation speed; the obtained nano-silver is firmly combined with the active carbon fiber with even particle diameter; and the product can be used in drinking water purification, medical sanitation and other fields.

Description

field of invention [0001] The invention relates to a method for preparing nano-silver activated carbon fiber composite material, in particular to a method for loading nano-silver on the surface of activated carbon fiber by adopting an electrochemical method. Background technique [0002] Activated carbon fiber is a carbon material with a high specific surface area and excellent adsorption performance, so it has been applied in the fields of gas adsorption purification, sewage treatment, drinking water purification and other fields. [0003] Previous studies have proved that metallic silver has antibacterial and sterilizing effects, and materials containing silver are widely used in antibacterial materials. Silver-loaded activated carbon fibers are new materials with excellent adsorption and bactericidal functions (such as Chinese patent CN1480584A using nano-silver combined with activated carbon fibers for antibacterial). The bactericidal ability kills it. Because its anti...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25D7/00C25D3/46B01J20/20B01J20/32
Inventor 刘晨明曹宏斌李玉平张懿
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI
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