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

A photocatalyst and magnetic technology, applied in the field of photocatalytic materials, can solve the problems of low photocurrent quantum yield, overflow of heavy metal ions, and reduced efficiency, and achieve the effects of easy recovery, no secondary pollution, and good thermal stability.

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

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Problems solved by technology

However, the very high energy band gap (Eg) makes it almost only respond to ultraviolet light, which accounts for about 5% of the solar light frequency.
Even for photocatalysts that can utilize visible light, heavy metal ions still overflow, causing secondary pollution; electron-hole pairs have high closure characteristics, resulting in low photoelectric flux yield; high surface energy makes the catalyst in Problems such as agglomeration and reduced performance are prone to occur during use

Method used

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

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preparation example Construction

[0037] triangular organic ligand H 3The preparation method of L(4,4',4"-[trimesyltri(carbonylbenzene)]-3,3',3"-trimethyl-tribenzoic acid) specifically follows the steps below:

[0038] 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;

[0039] Every 1mol of 4-amino-2-methylbenzoic acid corresponds to 65mL of DMF;

[0040] 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;

[0041] Every 1mol of trimesoyl chloride corresponds to 100mL of DMF and 0.36mol of triethylamine

[0042] Step c, adding distilled water to the reaction solution under continuous magnetic stirring, and removing DMF and distilled water with a Buch...

Embodiment 1

[0054] The organic ligand H 3 L (0.04mmol, 24.44mg), In(NO 3 ) 2 ·3H 2 O (0.08mmol, 25.51mg), hexamethylenetetramine (0.008mmol, 1.12mg) and 0.04mmol (9.26mg) Fe 3 o 4 , mixed in 10.0 mL of N,N-dimethylformamide, added dropwise concentrated nitric acid solution with a mass fraction of 65%, adjusted the pH of the reaction system to 5.0, and sealed it into a 25 mL small glass bottle. The solvothermal reaction was carried out at 110 °C for 80 hours, and then naturally cooled to room temperature to obtain the magnetic In-MOF-based photocatalyst.

[0055] figure 1 is the thermogravimetric curve of the prepared magnetic In-MOF-based photocatalyst, figure 1 The thermogravimetric curves showed that the magnetic In-MOF-based photocatalyst experienced three main weight loss stages in the range of 30-800 °C under flowing nitrogen at a temperature increase of 10 °C / min. The weight loss rate of about 11.87% between 30-106 °C should come from the departure of water molecules and air ...

Embodiment 2

[0065] The preparation method of a kind of magnetic In-MOF based photocatalyst of the present invention is specifically:

[0066] Under closed conditions, indium nitrate trihydrate In(NO 3 ) 2 ·3H 2 O, organic ligand H 3 L.Fe 3 o 4 Magnetic nanoparticles and template agent hexamethylenetetramine were dissolved in N,N-dimethylformamide solution and continuously stirred, and concentrated nitric acid solution was added dropwise to adjust the pH of the reaction system to 4.0, and the reaction was performed under solvothermal conditions. Obtain the above-mentioned magnetic In-MOF-based photocatalyst;

[0067] The solvothermal reaction temperature is 110°C, and the required reaction time is 72 hours;

[0068] Indium nitrate trihydrate, organic ligand H 3 L, hexamethylenetetramine, Fe 3 o 4 The molar ratio of nanoparticles and N,N-dimethylformamide is 2:1:0.2:1:500; the mass fraction of concentrated nitric acid solution is 65%;

[0069] triangular organic ligand H 3 The pr...

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Abstract

The invention discloses a preparation method of a magnetic InMOF-based photocatalyst. The method comprises the following steps: under closed conditions, dissolving indium nitrate trihydrate, organic ligand H3L, Fe3O4 magnetic nanoparticles and a template agent hexamethylenetetramine in an N,N-dimethylformamide solution, continuously stirring, regulating the pH value with a concentrated nitric acidsolution, and reacting under solvothermal conditions to obtain the magnetic In-MOF-based photocatalyst. The magnetic InMOF-based photocatalytic material is constructed by the coordination self-assembly of late transition metal indium (III) ions and triangular organic ligands H3L and Fe3O4 nanoparticles, the material has good thermal stability, can maintain the stability of a framework at 245 DEGC or below, and shows good photocatalytic degradation efficiency, water stability, easiness in recovery and recyclability when the material is used for photocatalytic degradation of active turquoise blue KN-G 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 In-MOF-based photocatalyst, and also relates to an application of the magnetic In-MOF-based photocatalyst. Background technique [0002] With the rapid industrialization of human society and the rapid increase of population, the deterioration of water quality and the shortage of water resources caused by the discharge of organic pollutants such as organic dyes have developed into serious environmental pollution problems. Globally there are approximately 8×10 5 tons of commercial dyes are produced and about 2% of them are released directly into the environment during the production process. In the process of use, more than 10% of the dyes used in the dyeing of textiles are discharged into the water, resulting in obvious high chroma, blocking the sun's rays, hindering or even interrupting the photosynthesis of aquatic...

Claims

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Application Information

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