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Nitrite ion scavenger in a kind of solution and its preparation method and application

A technology of nitrite ion and scavenger, which is applied in chemical instruments and methods, water/sewage treatment, water/sludge/sewage treatment, etc., to achieve the effect of simple preparation method, rapid removal and fast speed

Inactive Publication Date: 2017-03-08
SOUTHEAST UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Different from the above method, the present invention uses the specific combination of porous coordination polymer nanomaterials and nitrite ions to remove nitrite ions in the solution, which has not been reported at home and abroad

Method used

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  • Nitrite ion scavenger in a kind of solution and its preparation method and application
  • Nitrite ion scavenger in a kind of solution and its preparation method and application
  • Nitrite ion scavenger in a kind of solution and its preparation method and application

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Effect test

Embodiment 1

[0027] The preparation of embodiment 1 nitrite ion scavenger GDP-Tb

[0028] Preparation: Add 1 mL of 10 mM Tb(NO 3 ) 3 Aqueous solution, constituting GDP:Tb 3+ A mixture with a molar ratio of 1:1 was stirred to form a white precipitate. After stirring for 3 hours, the white precipitate was collected by centrifugation, washed three times with ultrapure water, and dried at 60°C to obtain the GDP-Tb material for use.

[0029] Nitrite ion removal: take a certain amount of GDP-Tb material and add 1mL containing 400μM NO 2 - In drinking water, stir to form a suspension, after 10 minutes, centrifuge the supernatant, and use naphthalene ethylenediamine hydrochloride spectrophotometry to measure NO in the supernatant 2 - concentration.

[0030]figure 1 It is a transmission electron microscope picture of the prepared nitrite ion scavenger GDP-Tb, which shows that GDP-Tb has a network shape. figure 2 Is the prepared nitrite ion scavenger GDP-Tb scavenging NO in the solution 2 ...

Embodiment 2

[0031] Embodiment 2: Preparation of nitrite ion scavenger U-Tb-OBBA and its nitrite ion removal

[0032] Preparation: Add 2 mL of 5-fluorouracil (U) at a concentration of 20 mM in N,N-dimethylformamide to 8 mL of N,N-dimethylformamide and 60 μL of 4,4-dicarboxylic acid at a concentration of 100 mM Diphenyl ether (OBBA) in N,N-dimethylformamide solution, mix well, then add 2mL of 40mM Tb(NO 3 ) 3 Aqueous solution, OBBA:U:Tb in mixed solution 3+ The molar ratio is 0.15:1:2. After stirring for 20 minutes, transfer the mixture to a polytetrafluoroethylene-lined reactor, react at 160°C for 2 hours, cool to room temperature naturally, and centrifuge to collect the resulting white precipitate. , and the precipitate was washed three times with absolute ethanol. Finally, the precipitate was dried at 60°C to obtain the U-Tb-OBBA material for future use.

[0033] Nitrite ion removal: Take a certain amount of U-Tb-OBBA material and add 1mL containing 400μM NO 2 - In drinking water, ...

Embodiment 3

[0035] Embodiment 3: the preparation of nitrite ion scavenger U-Tb

[0036] Preparation: Add 2 mL of 20 mM 5-fluorouracil (U) in N, N-dimethylformamide to 8 mL of N,N-dimethylformamide and 2 mL of 40 mM Tb(NO 3 ) 3 Aqueous solution, U:Tb in mixed solution 3+ The molar ratio is 1:2. After stirring and reacting for 20 minutes, transfer the mixed solution to a polytetrafluoroethylene-lined reactor, react at 160°C for 2 hours, cool to room temperature naturally, and collect the white precipitate by centrifugation. Wash three times with absolute ethanol. Finally, the precipitate was dried at 60°C to obtain the U-Tb material for future use.

[0037] Removal of nitrite ions: Take a certain amount of U-Tb material and add NO 2 - In drinking water, stir to form a suspension, after 10 minutes, centrifuge the supernatant, and use naphthalene ethylenediamine hydrochloride spectrophotometry to measure NO in the supernatant 2 - concentration.

[0038] Figure 7 It is the prepared n...

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Abstract

The invention discloses a nitrite ion scavenging agent in a solution and a preparation method and application thereof. Such a scavenging agent is generated by rare-earth terbium ions and ligands thereof through molecular self-assembly or a solvothermal reaction. The prepared scavenging agent is a hydrophilic porous coordination polymer nanometer material, and has a favorable function of specifically scavenging nitrite ions in various solutions. Compared with ordinary methods and scavenging agents for scavenging the nitrite ions, the nitrite ion scavenging agent which is provided by the invention is green, is simple and convenient in preparation method, is simple and convenient to use, can be used for specifically and quickly scavenging the nitrite ions, and has no secondary pollution to water quality. The prepared nitrite ion scavenging agent has favorable application prospects at the aspects of the removal and the purification of the nitrite ions in drinking water, environmental water and production waste water, and the like.

Description

technical field [0001] The invention relates to a nitrite ion scavenger in solution and its preparation method and application. The prepared scavenger can be applied to the removal and purification of nitrite ions in drinking water, environmental water, and production wastewater, and belongs to food supervision and environmental protection technologies. Background technique [0002] Nitrite is a widely used food additive and preservative. Since it was discovered in the 1970s that nitrite can form carcinogenic nitrosamines and nitrosamides in the body, which increases the risk of cancer, they have been widely used in the environment and food. content is limited. The World Health Organization Drinking Water Sanitation Standard stipulates that the content of nitrite in drinking water should not exceed 3mg / L. my country's sanitary standards for drinking water stipulate that the content of nitrite should not exceed 1mg / L. With the development of industry and agriculture and th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F1/58
Inventor 陈扬戚泽万
Owner SOUTHEAST UNIV
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