Visible light micro-nano reactor membrane for selective removal of ammonia nitrogen, preparation method and application thereof

A micro-nano reactor and selective technology, applied in chemical instruments and methods, light water/sewage treatment, special compound water treatment, etc. Real-time regeneration and other issues to achieve the effect of cheap and green online regeneration

Active Publication Date: 2020-03-06
BEIJING ORIGIN WATER FILM 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 problem of ammonia nitrogen treatment of actual municipal water polluted by low concentration ammonia nitrogen, and solve the problems of low selectivity of ion exchangers, difficult treatment of regeneration liquid, high regeneration cost and difficulty in realizing ammonia nitrogen treatment by using ion exchange method. The technical defect of in-situ real-time regeneration, providing a preparation method of visible light micro-nano reactor membrane for the selective removal of ammonia nitrogen

Method used

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  • Visible light micro-nano reactor membrane for selective removal of ammonia nitrogen, preparation method and application thereof
  • Visible light micro-nano reactor membrane for selective removal of ammonia nitrogen, preparation method and application thereof
  • Visible light micro-nano reactor membrane for selective removal of ammonia nitrogen, preparation method and application thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0042] Example 1 Preparation of visible light micro-nano reactor film

[0043] 1. Preparation of calcium aluminosilicate hydrate as a chloride ion adsorbent

[0044] In terms of molar ratio n(Ca):n(Al):n(Si)=4:1:2 Weigh calcium nitrate, aluminum nitrate and sodium silicate, prepare calcium nitrate with a concentration of 4mol / L with deionized water respectively Solution, 1mol / L aluminum nitrate solution and 2mol / L sodium silicate solution are 500mL each, mix the three solutions and stir for 3-5h under the condition of strong mechanical stirring at a speed of 100-500rad / min, then add 1mol / L sodium hydroxide solution adjusted the pH of the reaction system to 13.5. The reaction system was sealed and placed in a constant temperature water bath, and reacted at a constant temperature at 70°C for 120 hours. The obtained precipitate was washed 5 times with deionized water, and then the solid phase obtained after suction filtration was placed in an oven and heated at 55°C. After dryi...

Embodiment 2

[0053] The actual water samples were retrieved from a municipal sewage treatment plant in Beijing, and the concentrations of ammonia nitrogen, total nitrogen, chloride ions, calcium ions and magnesium ions, and pH values ​​of the water samples were determined.

[0054] Take 500mL water sample in a 1L transparent beaker, put a visible light micro-nano reactor membrane with a diameter of 8cm prepared in Example 1 into the water sample, and observe that the visible light micro-nano reactor membrane is in a suspended state in the water.

[0055] The beaker was placed on the open and flat ground outdoors, and was irradiated by sunlight for two hours. The beaker was taken back, and the water sample was analyzed again. The results are shown in Table 1 below.

[0056] Table 1 embodiment 1 every index of water sample

[0057]

[0058] It can be seen from Table 1 that the visible light micro-nano reactor membrane has a high selective removal effect on ammonia nitrogen, and the concen...

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Abstract

The invention provides a preparation method of a visible light micro-nano reactor membrane for selective removal of ammonia nitrogen. The method includes: taking calcium silicoaluminate hydrate, graphite-phase carbon nitride, an ammonium ion sieve material, polytetrafluoroethylene and dimethylacetamide as the main raw materials to obtain a mixed feed liquid, coating the obtained mixed feed liquidon a flat plate, and transferring dimethylacetamide into water, taking the flat plate out and performing drying to obtain the visible light micro-nano reactor membrane. By means of the ammonium ion sieve material, the visible light micro-nano reactor membrane provided by the invention can effectively realize selective exchange of ammonium ions from water, and through cooperation with a chloride ion adsorbent and a visible-light-induced photocatalyst, continuous regeneration of the ammonium ion sieve can be realized, continuous operation and stable water outflow of the membrane can be effectively realized, and the technical problems of low selectivity of conventional ion exchanger, difficult treatment of regenerated liquid, high regeneration cost, and difficult realization of in-situ real-time regeneration are solved.

Description

【Technical field】 [0001] The invention relates to the field of membrane technology, in particular to a visible light micro-nano reactor membrane with the selective removal function of ammonia nitrogen, and relates to the method and application of the membrane. 【Background technique】 [0002] With the development of industry, the modernization of life and the non-point source pollution of agriculture, the pollution of ammonia nitrogen in surface water is increasing day by day. For the ammonia nitrogen treatment of the actual municipal water polluted by low concentration ammonia nitrogen, the treatment technologies currently used mainly include biochemical method and ion exchange method. [0003] The biggest disadvantage of the biochemical method is that the operation is unstable, the ammonia nitrogen and total nitrogen in the produced water fluctuate too much, and it is difficult to achieve efficient and stable operation. This is because the main factors affecting biological...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/08
CPCC02F9/00C02F1/281C02F1/30C02F1/42C02F1/72C02F1/76C02F2305/10
Inventor 陈亦力莫恒亮李锁定俞开昌孟佳意刘曼曼薛涛李天玉
Owner BEIJING ORIGIN WATER FILM TECH
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