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Defective metal-organic framework photocatalyst and preparation method thereof

A technology of metal-organic framework and photocatalyst, which is applied in the direction of organic compound/hydride/coordination complex catalyst, chemical instrument and method, physical/chemical process catalyst, etc. It can solve the problem of poor processing effect of adding electron acceptor technology, Toxic metal ions are easy to dissolve, the environment has potential hazards and other problems, and achieve the effect of novel shape and structure, good use value and application value, and large photocurrent

Active Publication Date: 2020-08-28
HUNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the technical treatment effect of adding electron acceptors is not good, the preparation is complicated, and may have potential harm to the environment; while heterojunction photocatalysts are prone to photocorrosion, and toxic metal ions are easy to dissolve, which may cause environmental hazards and secondary Pollution

Method used

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  • Defective metal-organic framework photocatalyst and preparation method thereof
  • Defective metal-organic framework photocatalyst and preparation method thereof
  • Defective metal-organic framework photocatalyst and preparation method thereof

Examples

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Effect test

Embodiment 1

[0032] A defect-type metal-organic framework photocatalyst, specifically a defect-type MIL-53 metal-organic framework photocatalyst, which uses ferric chloride hexahydrate and terephthalic acid as raw materials and N,N-dimethylformamide as a solvent , prepared by solvothermal reaction under the action of an acid regulator, comprising the following steps:

[0033] (1) Dissolve ferric chloride hexahydrate, terephthalic acid in N , N-dimethylformamide, mix well to form a bright yellow clear solution, which is the mixed solution A.

[0034] (2) Add 10 μL, 20 μL, 30 μL, 40 μL, 50 μL, and 100 μL of HCl solution (that is, the acid regulator, with a concentration of 1 mol / L) into 56 mL of the mixed solution A obtained in step (1), and mix well to obtain a mixed Solution B.

[0035] (3) Put the mixed solution B obtained in step (2) into a reaction kettle, and perform a solvothermal reaction at a temperature of 170°C for 24 hours, wash the obtained crystals with DMF and methanol three...

Embodiment 2

[0046]Investigate the photocatalysts of defective metal organic framework (D-1, D-2, D-3, D-4, D-5, D-10) and perfect MIL-53 metal organic framework photocatalyst (MIL-53) in The photocatalytic degradation efficiency of tetracycline under the visible light condition of wavelength λ>420nm, comprises the following steps:

[0047] Take the defective metal-organic framework photocatalyst (D-1, D-2, D-3, D-4, D-5, D-10) prepared in Example 1 and the perfect type prepared in Comparative Example 1 MIL-53 metal-organic framework photocatalyst (MIL-53), 50mg each, was added to 100mL tetracycline solution with a concentration of 20mg / L, ultrasonically uniform, and reacted for 60min in the absence of light (magnetic stirring), to achieve adsorption After desorption equilibrium, under the condition of visible light with wavelength λ > 420nm, illuminate for 150min, sample 3mL every 30min, measure the characteristic peak of tetracycline in the solution with a UV-visible spectrophotometer, c...

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Abstract

The invention discloses a defective metal organic framework photocatalyst and a preparation method thereof. The defective type metal organic framework photocatalyst is a defective MIL-53 metal organicframework photocatalyst. The preparation method comprises the following steps: with ferric trichloride hexahydrate and terephthalic acid as raw materials and N,N-dimethylformamide as a solvent, carrying out solvothermal reaction under the action of an acid regulator to prepare the defective metal organic framework photocatalyst. The photocatalyst has the advantages of being uniform in mesoporousstructure, high in specific surface area, wide in light absorption range, small in forbidden band width, large in photocurrent, small in impedance, high in photocatalytic activity and the like. The catalyst is a novel visible-light photocatalyst, which is novel in morphology and structure and excellent in photocatalytic performance, and has very good use value and application value. The preparation method has the advantages of simple process, convenience in operation, low cost and the like, is suitable for large-scale preparation and is beneficial to industrial application.

Description

technical field [0001] The invention belongs to the field of photocatalyst preparation, and relates to a defect-type metal-organic framework photocatalyst and a preparation method thereof. Background technique [0002] In recent years, metal-organic frameworks (MOFs), as a class of crystalline porous materials with a periodic network structure formed by self-assembly of inorganic metal centers (metal ions or metal clusters) and bridging organic ligands, have attracted attention. received widespread attention. MILs series (Levasier skeleton material) is a trivalent metal ion (aluminum (Al), iron (Fe), vanadium (V), chromium (Cr ) and terephthalic acid and other carboxylic acid ligands to synthesize a class of MOF materials, the crystals synthesized based on different metal centers have the same crystal structure. MIL-53, as a member of the MIL series, is a kind of Fe(III) as The central metal ion, the MOF composed of octahedral Fe(III) and 1,4-terephthalic acid, has a band ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J31/22B01J35/10C02F1/30C08G83/00C02F101/38
Inventor 姜丹妮曾光明黄丹莲竺园陈明黄彬彬魏维宋彪秦蕾王晗周成赟
Owner HUNAN UNIV
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