Preparation method of MOF catalyst for photo-catalytic purifying of air

A technology for purifying air and catalysts, which is applied in the field of catalyst preparation to achieve the effects of strong adsorption capacity, improved catalytic performance, and high adsorption capacity

Active Publication Date: 2017-06-20
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Therefore, the preparation of MOF catalytic materials is still a challenge.

Method used

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  • Preparation method of MOF catalyst for photo-catalytic purifying of air

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preparation example Construction

[0020] A preparation method for a MOF catalyst for photocatalytic purification of air, comprising the steps of:

[0021] (a) Preparation of MOF-5 carrier by microwave radiation method:

[0022] (1) Zn(NO 3 ) 3 9H 2 O and H 2 BDC (terephthalic acid) was dissolved in deionized water respectively, and then the two were mixed to obtain a mixed solution, and the Zn(NO 3 ) 3 9H 2 O and H 2 The molar ratio of BDC in the mixed solution is (1-2):1;

[0023] (2) Add hydrofluoric acid dropwise to the mixed solution, continue to stir and mix evenly (usually 0.5-1h), the volume ratio of the described hydrofluoric acid to the mixed solution is 1:(60-100) , the concentration of hydrofluoric acid is 0.5mol / l.

[0024] (3) Transfer the mixed solution in step (2) to a microwave-specific polytetrafluoroethylene reaction tank, and start microwave heating reaction after sealing the reaction tank to obtain a mixed solution; the preferred microwave heating power is set to 300-800W, and the ...

Embodiment 1

[0030] (a) Zn(NO 3 ) 3 9H 2 O and H 2 BDC was dissolved in deionized water respectively, and then the two were mixed to obtain a mixed solution, and the Zn(NO 3 ) 3 9H 2 O and H 2 The molar ratio of BDC in the mixed solution is 2:1. Hydrofluoric acid was added dropwise to the mixed solution, and the stirring was continued for 0.5 h. Wherein the volume ratio of hydrofluoric acid to the above mixed solution is 1:60, and the concentration of hydrofluoric acid is 0.5mol / l. The solution was evenly transferred to a special microwave polytetrafluoroethylene reaction tank, and the microwave heating reaction was started after sealing. The microwave heating power was set to 300W, the heating rate was 20°C, the reaction temperature was 300°C, and the reaction time was 2h. After the reaction, the sample was cooled and crystallized, purified by DMF immersion method, dried and activated at a constant temperature of 160°C for 20 hours, and the MOF-5 carrier was obtained.

[0031] (...

Embodiment 2

[0035] (a) Zn(NO 3 ) 3 9H 2 O and H 2 BDC was dissolved in deionized water respectively, and then the two were mixed to obtain a mixed solution, and the Zn(NO 3 ) 3 9H 2 O and H 2 The molar ratio of BDC in the mixed solution was 1.5:1. Hydrofluoric acid was added dropwise and stirring was continued for 1 h. Wherein the volume ratio of hydrofluoric acid to the above mixed solution is 1:80, and the concentration of hydrofluoric acid is 0.5mol / l. The solution was evenly transferred to a special microwave polytetrafluoroethylene reaction tank, and the microwave heating reaction was started after sealing. The microwave heating power was set to 500W, the heating rate was 15°C, the reaction temperature was 350°C, and the reaction time was 3h. After the reaction, the sample was cooled and crystallized, purified by soaking in chloroform, dried and activated at a constant temperature of 150°C for 22 hours, and the MOF-5 carrier was obtained.

[0036] (b) AgNO 3 Dissolve in et...

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Abstract

The invention discloses a preparation method of an MOF catalyst for photo-catalytic purifying of air. The preparation method comprises the following steps of (a) preparing an MOF-5 carrier through a microwave radiation method; (b) dissolving AgNO3 in ethylene glycol, adding nanometer TiO2 powder into the solution for mixing, stirring and mixing uniformly, so as to obtain a precursor solution; (c) uniformly dispersing the MOF-5 carrier prepared in step (a) into DMF, then adding into the precursor solution prepared in step (b), reacting for 1 to 3h, then carrying out ultraviolet irradiation for 10 to 20min, using the DMF for washing obtained precipitate for multiple times, carrying out centrifugal separation, drying the precipitate in a freezer dryer for 1 to 3 days, finally grinding the dried precipitate, and sieving through a 20 to 40-mesh sieve to obtain the required catalyst. The service life of the catalyst prepared by adopting the method can be up to three years.

Description

technical field [0001] The invention relates to a preparation method of a catalyst, in particular to a preparation method of a catalyst applied to photocatalytic degradation of volatile organic pollutants. Background technique [0002] Volatile Organic Compounds (Volatile Organic Compounds, VOCs) are one of the main pollutants of ambient air pollution due to their large emissions and high toxicity, and have been listed as priority pollutants by countries all over the world. According to the definition of the World Health Organization (WHO), volatile organic compounds refer to a class of organic compounds with a boiling point between 50 and 260 °C, a saturated vapor pressure exceeding 133.32 Pa at room temperature, and existing in the air in the form of gases at room temperature. Including alkanes, alkenes, halogenated hydrocarbons, aromatic hydrocarbons, esters, aldehydes, etc. VOCs can stimulate the human respiratory system, central nervous system, and mucosal system, caus...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J31/16B01J35/10B01D53/86B01D53/72
CPCY02C20/30B01J31/1691B01D53/8668B01D2257/708B01D2258/06B01J35/004B01J35/10
Inventor 丁辉王宪琴
Owner TIANJIN UNIV
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