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Preparation method and application of imprinting material for removing nitrate in drinking groundwater

A technology of imprinted materials and nitrates, which is applied in the direction of contaminated groundwater/leachate treatment, chemical instruments and methods, water pollutants, etc., can solve the problems of low removal efficiency, decentralized rural drinking water, and difficult removal of nitrates. Achieve good selectivity and good adsorption effect

Inactive Publication Date: 2021-12-14
JILIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The purpose of the present invention is to provide a preparation method for selective adsorption of nitrate ion imprinting material, and also provide the application of selective adsorption of nitrate ion imprinting material in the targeted adsorption of nitrate in distributed rural drinking groundwater, so as to solve the problem of target To adsorb nitrate, low removal efficiency caused by non-target reaction in the existing drinking groundwater conversion and removal method of nitrate and difficulty in removing nitrate in decentralized rural drinking water

Method used

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  • Preparation method and application of imprinting material for removing nitrate in drinking groundwater
  • Preparation method and application of imprinting material for removing nitrate in drinking groundwater
  • Preparation method and application of imprinting material for removing nitrate in drinking groundwater

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preparation example Construction

[0030] The method for preparing imprinted materials for removing nitrate in drinking groundwater specifically includes the following steps:

[0031] A. Pre-assembly of imprinted materials: Weigh 0-1.7g of template molecule sodium nitrate, 5.38g of functional monomer dimethyl diallyl ammonium chloride and 1.421g of acrylamide, add N,N dimethylformamide and methanol In the mixed solution, stir at room temperature, and the pre-assembly time is 6-24h;

[0032] B. Polymerization reaction of materials: Heat the pre-assembled preparation solution in a 65°C water bath, and add 1.982-13.875g of crosslinking agent ethylene glycol dimethacrylate and initiator azo Diisobutyronitrile 0.821g, after material addition finishes, seal container, utilize bulk polymerization method to synthesize porous solid polymer;

[0033] C. Material cleaning and drying: After the synthesized material is cooled to room temperature, it is washed 5 times in absolute ethanol to remove mixed solvents and unreact...

Embodiment 1

[0037] A method for preparing an imprinted material for removing nitrate in drinking groundwater, comprising the steps of:

[0038] A. Weigh 0.85g of template molecule sodium nitrate, 5.38g of functional monomer dimethyl diallyl ammonium chloride and 1.421g of acrylamide in a 250mL silk mouth reagent bottle, and measure 40mL N,N dimethyl at the same time Formamide and 10 mL of methanol were added to a silk reagent bottle, placed in a water-bath shaker at 25°C, and shaken for 12 hours to obtain a polymerization reaction preparation solution.

[0039]B. Transfer the silk mouth reagent bottle containing the preparation solution to a 65°C water bath, add 9.911g of crosslinking agent ethylene glycol dimethacrylate and 0.821g of initiator azobisisobutyronitrile to the reaction vessel in turn , after adding the material, seal the container. Heat the polymerization reaction for 3h.

[0040] C. Cool the synthesized solid material to room temperature and wash it 5 times in absolute et...

Embodiment 2

[0042] The difference between this embodiment and embodiment 1 is:

[0043] The shaking time of template molecules and functional monomers described in step 1 is 6 hours when preloading.

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Abstract

The invention relates to a preparation method and application of an imprinting material for removing nitrate in drinking groundwater. The ionic imprinting material for the nitrate is prepared by taking sodium nitrate as a template, dimethyl diallyl ammonium chloride and acrylamide as functional monomers, ethylene glycol dimethacrylate as a cross-linking agent and azodiisobutyronitrile as an initiator by using a bulk polymerization reaction technology, has rapid adsorption capacity on nitrate radicals, and can be applied to targeted adsorption of nitrate in distributed rural drinking underground water. According to the invention, the influence of the pre-assembly time of the template and the functional molecule and the proportion of each component in the material on the saturated adsorption capacity of the material is explored respectively. The saturated adsorption capacity of the finally developed nitrate ion imprinting material to nitrate nitrogen is 14.876 mg / L, the material has good adsorbability, the selectivity coefficient of the material to NO3<-> is 1.833 relative to SO4<2->, and the material has good selectivity.

Description

technical field [0001] The invention belongs to the technical field of new materials for removing nitrate in groundwater, and in particular relates to a preparation method for selectively adsorbing nitrate ion imprinting materials and its application in the aspect of targeted adsorption of nitrate in distributed rural drinking groundwater. Background technique [0002] Groundwater is the main source of drinking water in rural areas in northern my country. Nitrate in groundwater will directly endanger the health of residents in rural areas. Residents' long-term intake of drinking water with excessive nitrate content will cause human diseases, and even cancer. Residents in the rural areas of northern my country are characterized by small settlements and a wide area. Compared with the urban population, the residents live relatively scattered, and the daily water consumption is small and fluctuates greatly with the seasons. It has the typical characteristics of decentralized grou...

Claims

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Application Information

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IPC IPC(8): C08F226/02C08F220/56C08F222/14C08J9/26B01J20/26C02F1/28B01J20/30C02F101/16C02F103/06C08L39/00
CPCC08F226/02C08F220/56C08J9/26B01J20/268C02F1/285C02F2103/06C02F2101/163C08J2339/00C08J2201/0444C08J2333/26C08F222/102
Inventor 董军李文德夏添梁雪
Owner JILIN UNIV