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Bimetallic organic framework material catalyst, preparation method and application

An organic framework and catalyst technology, applied in the field of catalytic reduction of precursor ozonation to generate nitrogen-containing by-products, preparation, bimetal organic framework material catalyst field, can solve the problems of MOFs catalyst characteristics, unclear synthesis method, etc., to achieve the reduction effect Excellent, high reduction rate effect

Active Publication Date: 2021-06-15
HUAQIAO UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In recent years, the use of MOFs and their composites to catalyze the degradation of organic compounds has been intensively studied, but the research on catalytic ozonation to reduce precursors to generate nitrogen-containing by-products has not been reported. The MOFs catalyst to achieve this purpose should be The characteristics and synthesis method are not yet clear

Method used

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  • Bimetallic organic framework material catalyst, preparation method and application
  • Bimetallic organic framework material catalyst, preparation method and application
  • Bimetallic organic framework material catalyst, preparation method and application

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Experimental program
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Effect test

Embodiment 1

[0031] A method for preparing a bimetallic organic framework material catalyst, comprising the steps of:

[0032] (1) Synthesis: 0.3350g zero-valent iron, 2.1470g Mn(NO 3 ) 2 Solution (50wt%), 2.5220g H 3 BTC, 600μL hydrofluoric acid (100%) and 75ml H 2 O was placed in a 100 mL reaction kettle lined with tetrapolyethylene fluoride, stirred and mixed evenly with a tetrafluoroethylene stirring rod, heated at 120 °C for 2 h, and then heated to 150 °C for 4 h.

[0033] (2) Washing: Take out the product and filter it with suction, soak the obtained product in absolute ethanol for 12 hours, and then wash it 5 times with fresh absolute ethanol;

[0034] (3) Drying: the orange product was separated by suction filtration, and the product was dried at a constant temperature of 70° C. for 12 hours.

[0035] (4) Vacuum activation: the dried powder product was then vacuum activated at a constant temperature of 200° C. for 12 hours to finally obtain the desired catalyst.

[0036] Subse...

Embodiment 2

[0040] The step (1)~(4) catalyst preparation method of embodiment 2 is the same as embodiment 1, and the difference with embodiment 1 is: the NDMA generation situation of catalyzed ozonation diethylhydrazide by different ozone concentrations, comprises the following steps:

[0041] Add ozone concentrations of 0, 0.5, 1, 2, and 4 mg / L to the samples containing 20 μM diethylhydrazide, and carry out catalytic oxidation for 1 hour under the conditions of pH 7 and catalyst dosage of 200 mg / L. Use 80 g / L sodium thiosulfate solution for quenching to terminate the reaction, respectively detect the generation of NDMA after the reaction.

[0042] The result is as Figure 4 , it can be seen that the formation of NDMA increases with the increase of ozone concentration in the process of catalytic ozonation and ozonation alone, but it can be clearly seen that at different ozone concentrations, the formation of NDMA is significantly reduced by catalytic ozonation.

Embodiment 3

[0044]The step (1)~(4) catalyst preparation method of embodiment 3 is the same as embodiment 1, and the difference with embodiment 1 is: by the NDMA generation situation of catalyzed ozonation diethylhydrazide under different pH, comprise the following steps:

[0045] A series of samples containing 20μM diethylhydrazide were adjusted to 5, 6, 7, 8, 9 respectively, the dosage of ozone was 2mg / L, and the dosage of catalyst was 200mg / L, and the catalytic oxidation was carried out for 1h. L sodium thiosulfate solution was quenched to terminate the reaction, and the generation of NDMA after the reaction was detected respectively.

[0046] The result is as Figure 5 , it can be seen that when butylhydrazide is oxidized by ozone alone, the formation of NDMA first increases and then decreases with the increase of pH, and reaches the maximum value at pH 8; while when bimetallic organic framework catalyzes ozone, the formation of NDMA increases with the increase of pH The increase firs...

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Abstract

The invention discloses a bimetallic organic framework material catalyst, a preparation method and application. The effective bimetallic organic framework material catalyst is prepared by adopting a direct solvothermal synthesis method, and the method comprises the steps of synthesis, washing, drying and activation. The catalyst is applied to the field of water treatment and is used for catalyzing and reducing nitrogen-containing by-products generated by ozonation of precursors. Raw materials for synthesizing and designing the catalyst are cheap and easy to obtain, and reaction operation is simple and easy to control; and the reaction conditions are mild, and a remarkable nitrogen-containing by-product reduction rate can be realized.

Description

technical field [0001] The invention belongs to the technical field of water treatment, and in particular relates to a bimetallic organic framework material catalyst, a preparation method and an application thereof, which are used to catalyze and reduce the ozonation of precursors to generate nitrogen-containing by-products. Background technique [0002] Dimethylnitrosamine (NDMA) is a nitrogen-containing disinfection by-product (N-DBPs) with strong carcinogenicity, teratogenicity and mutagenicity found in chlorine / chloramine disinfection. 0.7ng / L NDMA in drinking water can cause a one in a million cancer risk. Many water sources or water plants in my country and other countries have detected different concentrations of NDMA. The frequent detection of NDMA is a huge hidden danger to the safety of drinking water in our country, which needs to be solved urgently. [0003] Once NDMA is formed, it is difficult to be blown off in water, and it is easy to seep into groundwater fr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J31/22C02F1/78C02F101/38
CPCB01J31/1691B01J31/223C02F1/78B01J2531/72C02F2101/38Y02W10/37
Inventor 廖晓斌林青程与圣江志彬
Owner HUAQIAO UNIVERSITY
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