High nanometer sliver loading active carbon and preparation method thereof

Abstract

The present invention relates to high nanometer sliver loading active carbon and a preparation method thereof. A purpose of the present invention is to provide a simple nanometer sliver loading active carbon preparation method suitable for industrial production, and nanometer sliver loading active carbon prepared through the method. According to the present invention, the preparation process is divided into four modules such as nanometer silver medium preparation, active carbon pretreatment, silver supporting adsorption, and separation and purification, such that the modular preparation process is achieved, and the quality management control and the efficiency improving are easily achieved; with the method, the nanometer sliver loading active carbons having different uses can be prepared by using different specifications of the active carbon and different particle sizes of the nanometer silver mediums, the combination is diverse, and the control is flexible; the active carbon is pre-treated, such that the number and the density of the nanometer sliver adsorption groups on the surface and the inner wall can be improved so as to improve the silver loading amount (100-10000 ppm) and reduce the silver loss; and with the method, a variety of nanometer silver loading active carbons can be prepared, the silver loading amount and the nanometer silver particle size can be adjusted, and the wide application values are provided.

Description

technical field [0001] The invention relates to a high-loaded nano-silver activated carbon and a preparation method thereof. Specifically, it is a preparation method with simple process, low cost and high safety, which is suitable for industrial production; it can prepare nano-silver-loaded activated carbon of different specifications to meet Different needs can be used to prepare related products such as sewage treatment, waste gas treatment, antibacterial cleaning, environmental protection and purification, chemical catalysis, etc., with broad prospects. Background technique [0002] Over the past 30 years of reform and opening up, my country's economy and society have achieved sustained, rapid and profound development. In this process, with the rapid development of industrial manufacturing and agriculture, environmental problems have become increasingly serious. Among them, the deterioration of water quality and air pollution have seriously threatened people's health, pr...

AI Technical Summary

Problems solved by technology

Although no other reducing agent or complexing agent was added, the activated carbon fibers soaked in phosphoric acid had limited adsorption capacity for monovalent silver, which would affect the amount of silver loaded, and the particle size distribution of the reduced silver nanoparticles was not uniform, mainly distributed On the surface of activated carbon, it is difficult to form a stable and long-lasting adsorption and antibacterial and antibacterial effect

[0007] Although the method disclosed in the Chinese patent "A Method for Making Coconut Carbon Nano-Silver Activated Carbon" (publication number: CN104190357A) uses coconut shell activated carbon with high specific surface area and porosity, the activated carbon fibers are treated with simple hydrochloric acid before implanting nano-silver. Pickling, this can only play a certain role in dredging the pores and pipes of activated carbon, and has no obvious effect on the modification of the hydrophilicity of activated carbon, the increase of specific surface area and pore volume, so the effect on increasing the silver loading is very limited

The improvement of this invention is that the preparation process of nano-silver and the adsorption process of activated carbon are separated, and high-purity nano-silver particles are obtained, so that activated carbon can adsorb nano-silver in a relatively "clean" system, effectively avoiding other The interference of impurity compounds and ions, but because the nano-silver particles are not configured into a more stable and uniform nano-silver colloidal solution, the nano-silver particles cannot be fully compatible and contacted with the activated carbon fibers and Brownian diffuses into the pores, and the final adsorption is mainly Staying on the surface of activated carbon affects the amount of silver loaded and is not conducive to reducing silver loss

[0008] After long-term research, we found that the adsorption of silver particles on the surface of activated carbon mainly depends on the van der Waals force, which is very weak, and it is difficult to increase the amount of silver loaded and resist the loss of silver, so it is difficult to form a long-lasting activated carbon. The adsorption and bactericidal and antibacterial effect of

More importantly, the silver loading of this type of silver-loaded activated carbon is generally at the ppm level, ranging from tens to hundreds of ppm, and the particle size is mostly hundreds of nanometers, so the bactericidal ability is very limited

Images