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A kind of nano-silver composite material and preparation method for drinking water disinfection

A composite material and nano-silver technology, applied in botany equipment and methods, chemicals for biological control, disinfectants, etc., can solve the problem of inability to provide nano-confined space, difficulty in effectively exerting bactericidal effect, and difficulty in forming nanoparticles and other problems, to achieve the effect of stable load, light texture, preventing excessive growth and agglomeration

Active Publication Date: 2020-11-27
NANJING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, for nano-silver, if it is loaded in nanopores, it will not be able to contact with pathogenic bacteria (usually micron-sized), and it will be difficult to effectively exert the bactericidal effect; directly growing in micron-sized pores cannot provide nano-confined space , it is difficult to form nanoparticles
Therefore, how to prepare PP fiber-based nano-silver composites with high bactericidal effect through a simple and effective method is still a challenge.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Put 1 g of dried PP cotton (with an average pore size of 5 μm and a porosity of 80%) into 250 mL of 0.03 mol / LAgNO 3 and 20% CTAB solution, mix evenly and stir for 24 hours; take out and dry at 60°C and add 250 mL of 1% NaBH 4 solution, take it out after reacting for 12 hours; wash it with deionized water until no bubbles are produced in the effluent, then dry it.

[0026] After the acidification and digestion of the obtained nano-silver composite material, the loading amount of silver was measured by inductively coupled plasma mass spectrometry (ICP-MS) to be 0.5wt%, and it was found by scanning electron microscope-X-ray energy spectrometer (SEM-EDS) that the nano-silver was in the The PP cotton is evenly distributed, and the particle size of the silver nanoparticles in the obtained composite material is 5-80 nm observed by a transmission electron microscope.

Embodiment 2

[0028] The nano-silver composite material obtained in Example 1 was transferred to a jacketed glass adsorption column (Φ32×360 mm), and the water body was polluted by simulated microorganisms (the pH of the water body was about 7, and the concentration of Escherichia coli for 10 2 CFU / mL) through the composite material bed at a flow rate of 40ml / h, the continuous treatment capacity is 1000 bed volume (BV), no E. coli (<1 CFU / mL) can be detected in the effluent, and the silver in the water can be detected by ICP-MS The content of ions is less than 10 μg / L.

Embodiment 3

[0030] Put 1 g of dried PP cotton (with an average pore size of 5 μm and a porosity of 80%) into 250 mL of 0.03 mol / LAgNO 3 and 20% CTAB solution, mix evenly and stir for 24 hours; take out and dry at 60°C and add 250 mL of 1% NaBH 4 solution, take it out after reacting for 12 hours; wash it with deionized water until no bubbles are produced in the effluent, then dry it.

[0031] After acidification and digestion of the obtained nano-silver composite material, the loading amount of silver measured by ICP-MS is 0.5wt%. It is observed by SEM-EDS that the nano-silver is uniformly distributed in the PP cotton. The particle size is 5-80 nm.

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Abstract

The invention discloses a nano-silver composite material for drinking water disinfection and a preparation method thereof, belonging to the field of environment function materials. According to the composite material disclosed by the invention, polypropylene fiber is used as a carrier; the composite material is rich in ultra-large pore structures; the porosity factor is 30 to 80%; the apertures are 1 to 20mu m; the inner walls of pores are loaded with nano-silver particles; nano-silver is evenly distributed; the content is 0.1 to 5wt%; and the particle sizes are 5 to 80nm. The preparation method of the nanocomposite material can be summarized as follows: fully mixing polypropylene fiber with a solution containing silver ions and a surface active agent, stirring for a period of time, then taking out and drying the mixture, adding the mixture into a NaBH4 solution, after reacting for a period of time, taking out the mixture, using deionized water to wash away the residual surface active agent, and drying to obtain the composite material. The nanocomposite material disclosed by the invention is simple and easy in preparation, soft and light in texture, easy to carry and able to be used as a filler, and the material is high in disinfection efficiency, stable in nano-silver combination and low in wastage rate, does not generate disinfection by-products, and has obvious advantages compared with existing water body disinfection materials.

Description

technical field [0001] The invention is an environmental functional material, specifically a nano-silver composite material used for disinfection of drinking water and a preparation method thereof. Background technique [0002] Water disinfection is the most important measure to ensure the safety of drinking water. At present, the most commonly used methods for disinfection of drinking water are chlorine disinfection and heating and boiling, both of which can effectively kill pathogenic microorganisms in water and prevent the prevalence of aquatic diseases. However, chlorine disinfection is easy to react with organic matter coexisting in water, such as natural organic matter (NOMs), to generate disinfection by-products (DBPs) such as halogenated alkanes and halogenated aromatics, which are highly toxic and have the risk of carcinogenicity, teratogenicity, and mutagenesis , which poses a greater threat to human health; the heating and boiling method requires high energy and ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F1/50A01N59/16A01P1/00
CPCA01N59/16C02F1/50
Inventor 蒋朝潘丙才张孝林黎智贤张家伟
Owner NANJING UNIV
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