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TiO2 (at) MOF heterojunction photocatalyst with hollow frame morphology and preparation method thereof

A photocatalyst and heterojunction technology, applied in the field of nanomaterials, to achieve the effect of high photocatalytic activity

Active Publication Date: 2020-08-11
XUZHOU NORMAL UNIVERSITY
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the design and preparation of a TiO with a hollow frame morphology 2 Photocatalysts with @MOF heterostructures remain a great challenge

Method used

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  • TiO2 (at) MOF heterojunction photocatalyst with hollow frame morphology and preparation method thereof
  • TiO2 (at) MOF heterojunction photocatalyst with hollow frame morphology and preparation method thereof
  • TiO2 (at) MOF heterojunction photocatalyst with hollow frame morphology and preparation method thereof

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Embodiment

[0023] Step 1: Synthesis of NH 2 -MIL-125 precursor

[0024] Take 75 μL of tetraisopropyl titanate (TIPT) and 70 mg of 2-aminoterephthalic acid dissolved in 10 mL of N,N-dimethylformamide and methanol solution with a volume ratio of 7:5 in the mixed solution, the above The mixed solution was transferred to a 25mL polytetrafluoroethylene autoclave and heated to 150°C for a reaction time of 24h. After the reaction, the product was collected by centrifugation, washed with absolute ethanol several times, and dried in a drying oven to obtain NH with a square structure. 2 -MIL-125 precursor ( figure 1 ).

[0025] Step 2: Synthesis of TiO 2 @MOF heterojunction composites.

[0026] Take NH 2 -MIL-125 precursor (10mg) and tannic acid (20mg) were dissolved in 10mL aqueous solution, the above mixed solution was transferred to a polytetrafluoroethylene autoclave, heated to the target reaction temperature (150°C) and the desired reaction Time (60min). After the reaction, the produc...

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Abstract

The invention provides a preparation method of a TiO2 (at) MOF heterojunction photocatalyst with a hollow frame morphology. The preparation method comprises the following steps: dissolving tetraisopropyl titanate and 2-aminoterephthalic acid in an organic solvent, then transferring a mixture into a reaction kettle, carrying out a heating reaction for a period of time, after the reaction is finished, centrifugally collecting a product, cleaning and drying to obtain an NH2-MIL-125 precursor with a square block structure; dissolving an NH2-MIL-125 precursor and tannic acid in an aqueous solutionto obtain a mixed solution, transferring the mixed solution into a reaction kettle, heating to react for a period of time, centrifugally collecting a product after the reaction is finished, cleaning and drying to obtain the TiO2-MOF heterojunction photocatalyst with the hollow frame morphology. According to the invention, tannic acid is selected as a directional protective agent; NH2-MIL-125 is etched from inside to outside through a hydrolysis method, a TiO2 (at) MOF hollow frame structure with an exposed {100} surface is finally obtained, and the prepared photocatalyst TiO2 (at) MOF has higher photocatalytic activity than pure TiO2 and pure MOF.

Description

technical field [0001] The invention relates to nanomaterials, in particular to a TiO2@MOF heterojunction photocatalyst with hollow frame morphology and a preparation method thereof. Background technique [0002] Metal-organic framework (MOF) is a kind of crystalline material with porous network structure formed by the self-assembly of metal ions and organic ligands, which has the advantages of high specific surface area, adjustable pore size, high crystallinity and easy surface modification. NH 2 -MIL-125(Ti), an amino-functionalized Ti-based MOF, has been used as a visible-light photocatalyst for water purification due to its low cost, non-toxicity, water / light stability and sensitivity to visible light, Hydrogen production, organic synthesis and other photocatalytic fields. Similar to other single-component inorganic semiconductor photocatalysts, NH 2 -MIL-125(Ti) also has a high electron-hole recombination rate under light irradiation, resulting in a decrease in photo...

Claims

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Application Information

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IPC IPC(8): B01J31/22B01J31/38C01B3/04
CPCB01J31/2239B01J31/38B01J37/0018C01B3/042B01J2531/46B01J35/23B01J35/39Y02E60/36
Inventor 韩锡光袁玉胜
Owner XUZHOU NORMAL UNIVERSITY
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