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Method for removing micro or trace amount of N-nitrosodimethylamine in water by self-assembled metal coordination polymer catalyst film

A technology for the reaction of nitrosodimethylamine and nitrosodimethylamine, applied in organic compound/hydride/coordination complex catalysts, chemical instruments and methods, physical/chemical process catalysts, etc., can solve N- High water solubility of nitrosodimethylamine, long reaction time of biodegradation method, low Henry's law constant, etc., to achieve remarkable removal effect, technical feasibility, good economic and environmental benefits

Inactive Publication Date: 2017-05-31
TIANJIN POLYTECHNIC UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

And these methods for removing N-nitrosodimethylamine all have weak points
N-Nitrosodimethylamine has high water solubility, low Henry's law constant, and the conventional physical adsorption method and reverse osmosis method have poor treatment effects; the ultraviolet light irradiation method consumes a lot of energy and has a high cost; although the advanced oxidation technology It can efficiently degrade most organic substances, but the removal efficiency of N-nitrosodimethylamine is limited by hydroxyl radicals; the reaction time of biodegradation method is relatively long, much higher than the time required for photolysis and advanced oxidation

Method used

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  • Method for removing micro or trace amount of N-nitrosodimethylamine in water by self-assembled metal coordination polymer catalyst film
  • Method for removing micro or trace amount of N-nitrosodimethylamine in water by self-assembled metal coordination polymer catalyst film
  • Method for removing micro or trace amount of N-nitrosodimethylamine in water by self-assembled metal coordination polymer catalyst film

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] This example is to verify that the self-assembled metal coordination polymer catalytic membrane supports Fe 0 The effect of the amount on the reduction reaction of N-nitrosodimethylamine.

[0022] Add the prepared N-nitrosodimethylamine reaction solution with a concentration of 150 μg / L into a 50ml ground-mouth Erlenmeyer flask equipped with a rubber stopper, and perform magnetic stirring reaction on a multi-point intelligent magnetic stirrer. The temperature is 25° C., the rotational speed is 200 r / min, and the reaction solution is deoxidized by passing N2.

[0023] Adjust the initial pH value of the reaction solution to 6.5, add 0.42 g of self-assembled metal coordination polymer catalytic membranes with assembly layers of 1, 3, 5, 7, and 9, and use the method of measuring iron with o-phenanthroline to know the presence of iron in the membrane. The loads on the surface were 25.7mg / g, 77.6mg / g, 114mg / g, 151.7mg / g, 171.4mg / g respectively, and the reaction time was 1.5h...

Embodiment 2

[0026] This example is to verify the effect of different initial concentrations of N-nitrosodimethylamine on the reduction reaction of N-nitrosodimethylamine.

[0027] Prepared N-nitrosodimethylamine reaction solutions with 4 concentrations of 47.3 μg / L, 97.7 μg / L, 150.2 μg / L, and 196.5 μg / L. Use four 50ml ground-mouth Erlenmeyer flasks equipped with rubber stoppers to add the prepared 4 kinds of concentration N-nitrosodimethylamine reaction solution, and the reaction solution is passed through N 2 Deoxidation treatment. The magnetic stirring reaction was carried out on a multi-point intelligent magnetic stirrer, the reaction temperature was 25° C., and the rotation speed was 200 r / min.

[0028]Adjust the initial pH value of the reaction solution to 6.5, add 0.42 g of a self-assembled metal coordination polymer catalytic membrane with 5 assembly layers in the reaction flask, the content of zero-valent iron on the surface of the composite membrane is 114 mg / g, and the reaction...

Embodiment 3

[0031] This example is to verify the effect of different initial pH values ​​of solutions on the reduction reaction of N-nitrosodimethylamine.

[0032] Add the prepared N-nitrosodimethylamine reaction solution with a concentration of 150 μg / L into a 50ml ground-mouth Erlenmeyer flask equipped with a rubber stopper, and perform magnetic stirring reaction on a multi-point intelligent magnetic stirrer. The temperature is 25° C., the rotational speed is 200 r / min, and the reaction solution is deoxidized by passing N2.

[0033] Adjust the initial pH values ​​of the reaction solution to 2.52, 3.51, 5.1, 6.5, 8.51, and 9.49 respectively, add 0.42 g of a self-assembled metal coordination polymer catalytic membrane with an assembly layer of 5 in the reaction flask, and zero-valent iron on the surface of the composite membrane The content is 114mg / g, and the reaction time is 1.5h. Waters e2695 high performance liquid chromatography was used to detect the concentration of N-nitrosodimet...

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Abstract

The invention discloses a method for removing a micro or trace amount of N-nitrosodimethylamine in water by a self-assembled metal coordination polymer catalyst film. A self-assembled metal coordination polymer catalyst film material is added to a reaction flask filled with an N-nitrosodimethylamine solution subjected to nitrogen deoxidation, wherein the supported zero-valent iron content is 25.7 to 171.4 mg / g, and the initial concentration of the N-nitrosodimethylamine is 47.4 to 196.5 mu g / L. The reaction flask is sealed and then is placed on a multi-point intelligent magnetic stirrer for magnetic stirring reaction, wherein the rotary speed is 200 rpm, the temperature is 25 DEG C, the pH ranges from 2.5 to 9.5, and the stirring is carried out for 1.5 hours. According to the invention, the content of iron in the self-assembled metal coordination polymer catalyst film and the thickness of a surface functional layer are conveniently and effectively adjusted by controlling the number of assembly layers, the concentration of iron ions in coordination reaction and the pH of the solution, and high degree of activity and stability are maintained; the method has the advantages of simple preparation process, low cost, fast removal rate and the like.

Description

technical field [0001] The invention relates to a method for removing traces or traces of N-nitrosodimethylamine in water, which belongs to the water purification treatment process. Background technique [0002] After chlorine disinfection, N-nitrosodimethylamine, a disinfection by-product, will be produced. N-nitrosodimethylamine is one of the typical N-nitroso compounds with strong carcinogenic potential. The United States Environmental Protection Agency (USEPA) identified N-nitrosodimethylamine as a B2 carcinogen, and its unit carcinogenic risk concentration is 0.7ng L -1 , the carcinogenic risk factor reaches 10 -6 . The EPA has listed it as a priority pollutant, and it is recommended in the Integrated Risk Information System (IRIS) that the concentration of N-nitrosodimethylamine should be lower than 7ng L -1 . However, the existing water treatment process cannot meet the standard of N-nitrosodimethylamine, so it is extremely urgent to treat N-nitrosodimethylamine ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/70B01J31/28C02F101/38
CPCC02F1/70B01J31/28C02F2101/38
Inventor 张环王一冰傅敏刘玉红魏俊富李爽爽李雪曦安慧颖
Owner TIANJIN POLYTECHNIC UNIV
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