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Preparation method and application of magnetic Cu-MOF-based photocatalyst

A photocatalyst and magnetic technology, applied in the field of photocatalytic materials, can solve problems such as low utilization rate of visible light, easy agglomeration failure, heavy metal pollution, etc., and achieve good photocatalytic degradation efficiency, easy recycling, and no secondary pollution.

Active Publication Date: 2020-12-15
XI'AN POLYTECHNIC UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Metal Oxide Photocatalyst TiO 2 , ZnO, etc. can be used for photocatalytic degradation of dyes, but it is easy to lose, difficult to recycle and low utilization rate of visible light when it is practical
Metal sulfides CdS, In 2 S 3 The utilization rate of visible light is high, but it is easy to be polluted by heavy metals caused by light corrosion, and the high surface energy makes it easy to agglomerate and fail

Method used

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  • Preparation method and application of magnetic Cu-MOF-based photocatalyst
  • Preparation method and application of magnetic Cu-MOF-based photocatalyst
  • Preparation method and application of magnetic Cu-MOF-based photocatalyst

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preparation example Construction

[0035] triangular organic ligand H 3 The preparation method of L specifically follows the steps:

[0036]Step a, dissolving 4-amino-2-methylbenzoic acid in DMF, and continuously magnetic stirring in an ice-water bath until completely dissolved to obtain a mixed solution;

[0037] Every 1mol of 4-amino-2-methylbenzoic acid corresponds to 65mL of DMF;

[0038] Step b, dissolve trimesoyl chloride in DMF, stir until dissolved, and slowly add dropwise to the mixture in step a within 15 minutes, then add triethylamine dropwise within 10 minutes, react in an ice-water bath for 3 hours, and then React at room temperature for 24h to obtain a reaction solution;

[0039] Every 1mol of trimesoyl chloride corresponds to 100mL of DMF and 0.36mol of triethylamine

[0040] Step c, adding distilled water to the reaction solution under continuous magnetic stirring, and removing DMF and distilled water with a Buchner funnel after 30 min under reduced pressure suction filtration, that is, wash...

Embodiment 1

[0051] The organic ligand H 3 L (0.04mmol, 24.44mg), Cu(NO 3 ) 2 ·3H 2 O (0.08mmol, 14.36mg), piperazine hexahydrate (0.008mmol, 1.56mg) and 0.04mmol (9.26mg) Fe 3 o 4 , in 8.0mL of N,N-dimethylformamide and absolute ethanol mixed solution (volume ratio is 5:3), after uniform mixing, dropwise add a concentrated nitric acid solution with a mass fraction of 65%, to adjust the reaction system The pH value is 5.0, and it is sealed in a 25mL vial. Solvothermal reaction was carried out at 75 °C for 48 h, and then cooled to room temperature naturally to obtain the magnetic Cu-MOF-based photocatalyst.

[0052] figure 1 It is the thermal weight loss curve of the prepared magnetic Cu-MOF-based photocatalyst. It can be seen from the figure that the magnetic Cu-MOF-based photocatalyst in the range of 30-800℃ has experienced two The main weight loss stage; about 47.63% weight loss rate between 30-190 °C, from the departure of small guest molecules and coordinated DMF molecules in th...

Embodiment 2

[0063] The preparation method of a kind of magnetic Cu-MOF based photocatalyst of the present invention is specifically:

[0064] Under closed conditions, copper nitrate trihydrate Cu(NO 3 ) 2 ·3H 2 O and organic ligand H 3 L. Fe 3 o 4 Mix magnetic nanoparticles, template agent piperazine hexahydrate, N,N-dimethylformamide and absolute ethanol evenly, keep stirring, and add concentrated nitric acid solution dropwise to adjust the pH of the reaction system to 4.0, under solvothermal conditions Reaction, obtain above-mentioned magnetic Cu-MOF base photocatalyst;

[0065] Copper nitrate trihydrate, organic ligand H 3 L, piperazine hexahydrate and Fe 3 o 4 The molar ratio of nanoparticles is 2:1:0.2:1; the volume ratio of N,N-dimethylformamide and absolute ethanol is 5:1; the mass fraction of concentrated nitric acid solution is 65%; the temperature of solvothermal reaction 65°C, the required reaction time is 24 hours;

[0066] triangular organic ligand H 3 The preparat...

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Abstract

The invention discloses a preparation method of a magnetic Cu-MOF-based photocatalyst, and the method comprises the following steps: under closed conditions, uniformly mixing copper nitrate trihydrateCu(NO3)2.3H2O with organic ligand H3L, Fe3O4 magnetic nanoparticles, template agents piperazine hexahydrate, N, N-dimethylformamide and absolute ethyl alcohol, continuously stirring, and dropwisely adding a concentrated nitric acid solution to regulate the pH value of a reaction system to 4.0-6.0, and reacting under a solvothermal condition to obtain the magnetic Cu-MOF-based photocatalyst. The absorption wavelength range of the material to visible light is 475-800nm, and the material shows excellent visible light response capability; the magnetic CuMOF-based photocatalyst has good thermal stability, can maintain the stability of a framework at 265 DEG C or below, and shows good photocatalytic degradation efficiency, water stability and recyclability when used for the photocatalytic degradation of active dark blue K-R in water.

Description

technical field [0001] The invention belongs to the technical field of photocatalytic materials, and in particular relates to a preparation method of a magnetic Cu-MOF-based photocatalyst, and also relates to an application of the magnetic Cu-MOF-based photocatalyst. Background technique [0002] About 2 / 3 of the world's people live in water-scarce areas, and water pollution has further exacerbated the shortage of fresh water. According to statistics, about 800,000 tons of dyes are produced globally every year, and 10-15% of the dyes will enter the environmental water body during the production and dyeing process, resulting in hundreds of millions of tons of highly toxic, highly carcinogenic / mutagenic wastewater. Humans consume about 30 million tons of textiles every year, and most of them need to be dyed. Among the dyes used, those with azo (phenylazobenzene) structure account for about 75%. The most representative ones are reactive dyes, which have high stability (such as ...

Claims

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Application Information

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IPC IPC(8): B01J31/22B01J31/28B01J35/02C02F1/30C07C231/02C08G83/00C07C233/81C02F101/30C02F101/38
CPCB01J31/2239B01J31/28C08G83/008C02F1/30C07C231/02C02F2305/10C02F2101/308C02F2101/40B01J2531/16B01J35/39B01J35/40B01J35/33C07C233/81Y02W10/37
Inventor 李庆樊增禄张洛红武占省王理明朱炜
Owner XI'AN POLYTECHNIC UNIVERSITY
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