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Method for preparing nano silver organic frame ultrafiltration membrane and method for purifying water using nano silver organic frame ultrafiltration membrane

An organic framework and nano-silver technology, applied in ultrafiltration, chemical instruments and methods, membranes, etc., can solve the problems of poor removal of micro-pollutants in water, poor compatibility, and biological pollution in the filtration process, achieving short process cycles, Good compatibility and strong universal effect

Active Publication Date: 2017-03-15
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to solve the problems of poor compatibility of silver particles in the existing nano-composite ultrafiltration membrane, serious biological pollution in the filtration process and poor removal effect of micro-pollutants in water, and to provide a preparation method of nano-silver organic framework ultrafiltration membrane

Method used

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  • Method for preparing nano silver organic frame ultrafiltration membrane and method for purifying water using nano silver organic frame ultrafiltration membrane
  • Method for preparing nano silver organic frame ultrafiltration membrane and method for purifying water using nano silver organic frame ultrafiltration membrane
  • Method for preparing nano silver organic frame ultrafiltration membrane and method for purifying water using nano silver organic frame ultrafiltration membrane

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specific Embodiment approach 1

[0028] Embodiment 1: This embodiment is a method for preparing a nano-silver organic framework ultrafiltration membrane, which is specifically completed according to the following steps:

[0029] 1. Prepare the polymer solution: mix the polymer powder with the dispersion solvent I, then stir and react at a stirring speed of 400r / min to 600r / min and a temperature of 50°C to 60°C for 4h to 6h to obtain a polymer solution;

[0030] The mass ratio of polymer powder described in step 1 and dispersion solvent I is 15:(70~85);

[0031] 2. Preparation of a mixed solution containing nano-silver organic framework: the AgNO 3 . The metal salt of the organic framework and the ligand of the organic framework are dissolved in the dispersion solvent II, and then reacted in a reaction kettle at a temperature of 80°C to 156°C for 0.5h to 24h to obtain a mixed solution containing nano-silver organic framework;

[0032] AgNO as described in step 2 3 The mass ratio to dispersing solvent II is 1...

specific Embodiment approach 2

[0047] Embodiment 2: This embodiment differs from Embodiment 1 in that the polymer described in step 1 is polyvinylidene fluoride, polysulfone, polyethersulfone, cellulose acetate or polyacrylonitrile. Other steps are the same as in the first embodiment.

specific Embodiment approach 3

[0048] Specific embodiment three: the difference between this embodiment and specific embodiment one or two is: the dispersion solvent I described in step one is N,N-dimethylformamide, 1-methyl-2-pyrrolidone, 1-vinyl-2-pyrrolidone or N,N-dimethylacetamide. Other steps are the same as those in Embodiment 1 or 2.

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Abstract

The invention provides a method for preparing a nano silver organic frame ultrafiltration membrane and a method for purifying water using the nano silver organic frame ultrafiltration membrane, and relates to a preparation method of an ultrafiltration membrane and a method for purifying the water using the ultrafiltration membrane. The problems that an existing nano composite ultrafiltration membrane is poor in silver particle compatibility, serious in biological pollution in a filtration process and poor in removal effect on micro pollutants in water are solved. The method for preparing the nano silver organic frame ultrafiltration membrane includes the following steps: 1, preparing a polymer solution; 2, preparing a mixed solution containing a nano silver organic frame; 3, preparing a membrane-forming liquid; 4, conducting flow-casting and membrane scraping to obtain the nano silver organic frame ultrafiltration membrane. According to the prepared nano silver organic frame ultrafiltration membrane, the flux of a filtered pollutant aqueous solution is 100-150 L / m<2>.h, the removal rate of Escherichia coli is 95%-100%, and the removal rate of nitrogenous disinfection by-products is 92%-100%. The method for purifying the water using the nano silver organic frame ultrafiltration membrane can be obtained.

Description

technical field [0001] The invention relates to a preparation method of an ultrafiltration membrane and a method for purifying water using the ultrafiltration membrane. Background technique [0002] Ultrafiltration membranes are increasingly used in the field of water treatment, and their pore sizes are mostly between 20 and 100nm, which can effectively intercept colloids, turbidity, and microorganisms in water, but are not suitable for natural humus, personal care products, drugs, and microbial metabolites. , Algae toxins, disinfection by-products and other soluble small molecule organic matter are poorly removed, seriously reducing the drinking water purification effect of ultrafiltration membranes. In addition, during the ultrafiltration process, microorganisms form a large resistance pollution layer through the adhesion, growth, reproduction, and shedding behavior on the membrane surface, which greatly reduces the water flux of the ultrafiltration membrane. Membrane fou...

Claims

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Application Information

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IPC IPC(8): B01D61/14B01D67/00B01D69/12B01D69/02B01D71/06C02F1/44
CPCB01D61/145B01D67/0002B01D69/02B01D69/12B01D71/06B01D2325/48C02F1/444C02F2101/12C02F2101/18C02F2101/36C02F2101/38C02F2303/04C02F2305/023
Inventor 王盼盼马军孙志强宋丹林茹
Owner HARBIN INST OF TECH
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