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A kind of heterojunction MOF catalyst and its preparation method and application

A heterojunction and photocatalyst technology, applied in chemical instruments and methods, physical/chemical process catalysts, organic compounds/hydrides/coordination complex catalysts, etc., can solve the problem that photocatalytic performance has not received much attention, MOFs poor stability and other issues, to achieve excellent photocatalytic performance, good stability, the effect of a simple method

Active Publication Date: 2020-11-24
ZHEJIANG GONGSHANG UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the research on Fe-MOF mainly focuses on the selection of organic ligands, pore regulation and micro-morphology regulation, but its excellent photocatalytic performance has not received much attention, and due to cost constraints and poor stability of some MOFs , it is still necessary to conduct in-depth research on MOFs

Method used

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  • A kind of heterojunction MOF catalyst and its preparation method and application
  • A kind of heterojunction MOF catalyst and its preparation method and application
  • A kind of heterojunction MOF catalyst and its preparation method and application

Examples

Experimental program
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Effect test

Embodiment 1

[0047] Heterojunction MOF photocatalyst [Fe-(2-mim) / H 2 The preparation method of BDC], the steps are as follows:

[0048] (1) Dissolve 40mmol 2-methylimidazole in 25mL N,N-dimethylformamide, stir until completely dissolved to obtain reaction solution A; dissolve 4mmol terephthalic acid in 25mL N,N-dimethylformamide Amide, stirred until completely dissolved to obtain reaction solution B; 4mmol FeCl 3 Dissolve in 50mL N,N-dimethylformamide and stir until completely dissolved to obtain reaction solution C.

[0049] (2) Mix the reaction solution A with the reaction solution B, and stir evenly to obtain the reaction solution D; add the reaction solution D dropwise to the reaction solution C to obtain a uniform heterojunction MOF precursor solution;

[0050] (3) Transfer the homogeneous heterojunction MOF precursor solution to a high-pressure reactor, conduct a hydrothermal reaction at 150°C for 15 hours, centrifuge, wash with ethanol and distilled water in turn, and carry out th...

Embodiment 2

[0053] The mixed organic ligands form a heterojunction during the preparation process, which can improve the stability and degradation effect of the prepared MOFs after being combined with the central metal atom. The photocatalytic effect of the heterojunction MOF is better than that of any single organic ligand and The prepared MOFs are combined with the same central metal atoms.

[0054] Taking the degradation of Cr(VI)-containing wastewater as an example to compare the photocatalytic activity. Add chromium-containing wastewater with a volume of 100 mL and a concentration of 80 μmol / L into the reactor, add 10 mg of different organic ligand MOFs visible light catalysts, do not adjust the pH, keep stirring, stir in the dark for 30 minutes to adsorption equilibrium, and turn on the visible light source , sampling at intervals of 15 minutes.

[0055] Such as figure 1 , the visible-light photocatalytic activity of the heterojunction MOF is significantly better than that of any ...

Embodiment 3

[0057] Two kinds of organic ligands are mixed with the central metal atoms to prepare heterojunction MOFs. Changing the mixing ratio of the organic ligands will lead to changes in the binding mode and order of the central metal atoms, resulting in changes in the microstructure of the prepared heterojunction MOFs, and then Affecting the visible light catalytic effect of heterojunction MOFs.

[0058] A series of catalysts were prepared by changing the mixing ratio of 2-methylimidazole and terephthalic acid in Example 1, and compared with the chromium reduction operation in Example 2.

[0059] Such as figure 2 , in 2-methylimidazole with terephthalic acid and Fe 3+ When the molar ratio of Cr(VI) is 10:1:1, the reduction effect of Cr(VI) is the best, so the heterojunction MOF prepared under this ratio has the best visible light catalytic activity.

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Abstract

The invention discloses a preparation method and application of a magnetically recyclable heterojunction MOF photocatalyst. The preparation method includes: (1) uniformly dispersing 2-methylimidazole, terephthalic acid, and ferric chloride in N , obtain a uniform solution in N-dimethylformamide; (2) Mix and stir the obtained 2-methylimidazole solution and terephthalic acid solution evenly, and add Fe dropwise 3+ in the solution; (3) The precursor solution is hydroheated, washed, vacuum dried and ground in sequence to obtain a heterojunction MOF photocatalyst. The photocatalyst prepared by the invention improves the catalytic performance and stability of the single ligand MOF, has low raw material prices, has certain magnetism, is easy to recycle, and has high economic benefits.

Description

technical field [0001] The invention relates to the technical field of photocatalytic materials, in particular to the technical field of visible light-responsive photocatalytic materials, and in particular to a preparation method and application of a heterojunction MOF photocatalyst. Background technique [0002] As a common heavy metal pollutant, hexavalent chromium (Cr(VI)) mainly comes from industries such as tanning, electroplating, textile manufacturing, and metal processing. Due to its acute toxicity and strong carcinogenicity to most organisms, it has There is a great threat to the safety of human life. Trivalent chromium (Cr(III)) is not only non-toxic, but also an essential micronutrient element for the human body, so reducing Cr(VI) to Cr(III) is an effective method to deal with chromium pollution in water. Among the various methods reported, the photocatalytic reduction of Cr(VI) is a promising technology for environmental remediation, the core of which lies in t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J31/28C02F1/30C02F1/48C02F101/22
CPCC02F1/30C02F1/488B01J31/28C02F2305/10C02F2101/22B01J35/33B01J35/39
Inventor 高桥远王齐吴宏林大港范勇杰高慧敏李俊峰夏文韬
Owner ZHEJIANG GONGSHANG UNIVERSITY
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