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Preparation and application of copper porphyrin functionalized metal-organic framework/titanium dioxide composites

A metal-organic framework, titanium dioxide technology, applied in the field of composite materials and photocatalysis, can solve the problems of poor selectivity, weak molecular activation ability, and low light-assisted application efficiency.

Active Publication Date: 2020-11-10
NORTHWEST NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, TiO 2 The light-assisted application of the still low efficiency, poor selectivity, and adsorption of CO 2 Molecular activation is weak

Method used

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  • Preparation and application of copper porphyrin functionalized metal-organic framework/titanium dioxide composites
  • Preparation and application of copper porphyrin functionalized metal-organic framework/titanium dioxide composites
  • Preparation and application of copper porphyrin functionalized metal-organic framework/titanium dioxide composites

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] (1) Nano-TiO 2 Preparation: Add 5 mL of tetra-n-butyl titanate to 10 mL of ethanol solution, and stir in an ice bath for 1 hour. After that, 6 mL of water-ethanol mixed solution (water:ethanol=1:4v / v) was added into the reaction system and stirred for 1 hour. Then, the reaction mixture was transferred to a 50 mL polytetrafluoroethylene-lined steel autoclave, and heated at 180°C for 12 hours, and cooled naturally; the product was collected by centrifugation, and washed with deionized water and absolute ethanol more than five times in succession; The product is dried at 80°C to obtain a white solid powder, which is nano-TiO 2 ;

[0039] (2) CTU / TiO 2 Preparation of composite materials: take 0.2 gTiO 2 Nanoparticles were dissolved in 2mL DMF solution and kept stirring for 30 min, ultrasonic for 10 min; then 30mg ZrCl was added to the solution in sequence 4 , 30 mg terephthalic acid, 10 mg CuTCPP and 0.5 g benzoic acid, and stirred at room temperature for 30 minutes; t...

Embodiment 2

[0042] (1) Nano-TiO 2 The preparation: with embodiment 1;

[0043] (2) CTU / TiO 2 Preparation of composite materials: TiO 2 The consumption of nanoparticles is 0.4g, and others are the same as in Example 1. In the obtained sample, the load of CTU is 15 wt%;

[0044] (3) CTU / TiO 2 Photocatalytic reduction of CO 2 Performance test: CO yield is 21.89 μmolg -1 h -1 , CH 4 0.148μmolg -1 h -1 .

Embodiment 3

[0046] (1) Nano-TiO 2 The preparation: with embodiment 1;

[0047] (2) CTU / TiO 2 Preparation of composite materials: TiO 2 The dosage of nanoparticles is 0.6g, and others are the same as in Example 1; in this sample, the load of CTU is 10 wt%;

[0048] (3) CTU / TiO 2 Photocatalytic reduction of CO 2 Performance test: CO yield is 31.32μmolg -1 h -1 , CH 4 0.148μmolg -1 h -1 .

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Abstract

The invention discloses a method for preparing a copper porphyrin functionalized metal organic framework / titanium dioxide composite heterojunction material. The method is to ultrasonically disperse titanium dioxide nanoparticles in DMF, and then add ZrCl to the solution in sequence. 4 , terephthalic acid, CuTCPP and benzoic acid, stir at room temperature to fully mix; then hydrothermally react the mixed solution at about 130°C for 10 to 12 hours; centrifuge, collect the product, wash with DMF and acetone, and dry to obtain the target ProductCTU / TiO 2 . The test results show that CTU / TiO 2 Not only maintains good photocatalytic cycle stability, but also exhibits excellent photocatalytic activity. Compared to pure TiO 2 or CTU, CTU / TiO 2 Shows significantly enhanced reduction of CO 2 photocatalytic activity. In addition, CTU / TiO 2 Composite materials in photocatalytic reduction of CO 2 It is highly stable and recyclable.

Description

technical field [0001] The invention relates to the preparation of a copper porphyrin functionalized metal organic framework / titanium dioxide composite heterojunction material, which is mainly used in the photocatalytic reduction of carbon dioxide to generate hydrocarbons, and belongs to the technical field of composite materials and the field of photocatalysis. Background technique [0002] Environmental problems caused by the excessive emission of greenhouse gas carbon dioxide have become the focus of researchers in recent years. In order to solve this serious problem, various researches have been carried out. Photocatalytic reduction of carbon dioxide to produce hydrocarbons is one of the most attractive technologies to address environmental issues and energy shortages. Metal-organic frameworks (MOFs) are a class of crystalline hybrid porous materials consisting of clusters coordinated by metal ions and organic ligands, exhibiting ultra-large specific surface area and co...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J31/38C07C1/02C07C9/04
CPCC07C1/02B01J31/38C07C2531/38B01J2531/16B01J2531/025B01J35/393B01J35/39B01J35/23B01J35/399C07C9/04
Inventor 王磊段树华金鹏霞周华马小玉佘厚德黄静伟王其召
Owner NORTHWEST NORMAL UNIVERSITY
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