Synthetic method of nanofiber membrane-shaped efficient water body solid-phase denitrification carbon source

A nanofiber membrane, nitrocarbon source technology, applied in chemical instruments and methods, fiber treatment, water pollutants, etc., can solve the problems of limited application of efficiency, precipitation of other pollutants, insufficient reaction rate, etc.

Active Publication Date: 2020-10-27
TONGJI UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the slow reaction rate of natural materials and the precipitation of other pollutants, the lack of efficiency and side effects limit its application.
Synthetic polymers are also unable to develop solid phase nitration technology due to the insufficient relative reaction rate and apply it in practice

Method used

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  • Synthetic method of nanofiber membrane-shaped efficient water body solid-phase denitrification carbon source

Examples

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Comparison scheme
Effect test

Embodiment 1

[0020] Example 1, PHB (polyhydroxybutyrate), PHBV (polyhydroxyvalerate) and PLA (polylactic acid) were mixed at 1:1:1 to form a solid phase mixture, and DMF (dimethylformamide) After mixing with chloroform at 1:9 to form a liquid phase mixture, the solid phase mixture was blended into the liquid phase mixture at 35°C to obtain 8wt.% PHB (polyhydroxybutyrate) / PHBV (polyhydroxyvalerate) / PLA (polylactic acid) content of the polymer solution; above-mentioned polymer solution is carried out electrospinning, and regulating spinning voltage is 25kv, and receiving distance is 25cm, and ambient humidity is 35% relative humidity, and temperature is 30 ℃, on release paper Collect the obtained electrospun nanofiber membrane; place the electrospun nanofiber membrane in a vacuum oven at 60°C for 2 hours to evaporate the liquid solvent, then wash it with deionized water and bake it in an oven at 80°C for 2 hours to dry , to obtain a nanofiber film-like high-efficiency solid phase nitrificati...

Embodiment 2

[0023] Example 2, PBS (polybutylene succinate), PHA (polyhydroxyalkanoate) and PLA (polylactic acid) are mixed at 1:5:1 to form a solid phase mixture, and DMF (dimethyl formamide) mixed with chloroform 2:8 to form a liquid phase mixture, and the solid phase mixture was blended into the liquid phase mixture at 40°C to obtain 7wt.% PHB (polyhydroxybutyrate) / PHBV (polyhydroxyvalerate ) / PLA (polylactic acid) content of the polymer solution; the above-mentioned polymer solution is electrospun, the adjustment spinning voltage is 20kv, the receiving distance is 25cm, the ambient humidity is 30% relative humidity, and the temperature is 35°C. The electrospun nanofiber membrane collected on the type paper; place the electrospun nanofiber membrane in a vacuum oven at 60°C for 2 hours to evaporate the liquid solvent, then wash it with deionized water and bake it in an oven at 80°C for 2 hours to drying to obtain a nanofiber film-like high-efficiency solid phase nitrification carbon sourc...

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Abstract

The invention discloses a synthetic method of a nanofiber membrane-shaped efficient water body solid-phase denitrification carbon source. The synthetic method comprises the following steps of S1, mixing degradable synthetic polymers according to a ratio of 1: (1-10) to form a solid-phase mixture; S2, mixing DMF (dimethylformamide) and trichloromethane according to a ratio of 1: (1-10) to form a liquid-phase mixture; S3, dissolving the solid-phase mixture into the liquid-phase mixture at the temperature of 40-60 DEG C to obtain a polymer solution with the content of PHB (polyhydroxybutyrate)/PHBV (polyhydroxyvalerate)/PLA (polylactic acid) being 4-12wt%; S4, performing electrostatic spinning on the polymer solution to obtain an electrospun nanofiber membrane; and S5, putting the electrospunnanofiber membrane into a vacuum drying oven at 60 DEG C for 2 to 24h, cleaning the electrospun nanofiber membrane with deionized water, and drying the cleaned electrospun nanofiber membrane in a drying oven at 80-120 DEG C to obtain the nanofiber membrane-shaped efficient solid-phase denitrification carbon source for the water body, so that denitrification nitrogen removal can be performed on low-concentration, large-water-volume and eutrophicated natural water body, and the removal rate of nitrate nitrogen can reach 99%.

Description

technical field [0001] The invention relates to the technical field of water body treatment, in particular to a method for synthesizing a nanofiber film-like high-efficiency water body solid-phase nitrification carbon source. Background technique [0002] Increased nitrate levels in polluted water bodies have become a serious problem worldwide due to the extensive use of chemical fertilizers and pesticides, as well as sewage irrigation. High concentrations of nitrates pose a potential risk of eutrophication and toxic algal blooms in receiving waters. Nitrate is considered one of the harmful pollutants in drinking water because it causes methemoglobinemia (blue baby syndrome) in infants, while the conversion of nitrate to nitrite in saliva may lead to the formation of nitrosamines , and nitrosamines are known carcinogens. The maximum allowable concentration of nitrate in drinking water in my country is limited to 1.2mg / L. Surface water quality standard Class III water limi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D04H1/728D01D5/00C02F3/28D04H1/4382C02F101/16
CPCC02F3/2806C02F2101/16D01D5/003D04H1/4382D04H1/728
Inventor 李世阳黄翔峰马成锦刘佳陆丽君彭开铭
Owner TONGJI UNIV
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