ag@mofs/tio 2 Preparation method and application of photocatalyst

A technology of photocatalyst and reactor, applied in the direction of organic compound/hydride/coordination complex catalyst, physical/chemical process catalyst, chemical instrument and method, etc., can solve the problem of high photogenerated electron-hole recombination rate, achieve The effect of improving photocatalytic efficiency and improving separation rate

Active Publication Date: 2020-04-07
SOUTH CHINA UNIV OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to overcome the defects of competitive adsorption of various pollutants on the surface of the catalyst and the high recombination rate of photogenerated electrons and holes, and provide an Ag@MOFs / TiO 2 Photocatalyst and its preparation method and application

Method used

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  • ag@mofs/tio <sub>2</sub> Preparation method and application of photocatalyst
  • ag@mofs/tio <sub>2</sub> Preparation method and application of photocatalyst
  • ag@mofs/tio <sub>2</sub> Preparation method and application of photocatalyst

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Embodiment 1

[0032]Preparation of MIL-101: Add 4.002g of chromium nitrate nonahydrate and 1.661g of terephthalic acid into 70ml of aqueous solution A, stir at room temperature for 0.5h, then add 0.5ml of hydrofluoric acid solution B into mixed solution A , mixed and stirred for 0.5h, transferred the mixed solution C to the polytetrafluoroethylene reactor liner, then put the polytetrafluoroethylene reactor liner into the high-pressure reactor, and reacted at 220°C for 10h under high temperature and high pressure, and then put The solution was filtered through a 250-mesh stainless steel filter, washed three times with DMF and deionized water, and dried under vacuum at 150°C to finally obtain MIL-101.

[0033] Preparation of Ag@MIL-101: Add 0.1g of MIL-101 to 20mL of petroleum ether organic solution, ultrasonically mix, stir at room temperature for 30min to obtain solution A, then add 0.35ml of AgNO 3 Add dropwise to the stirring solution A, continue stirring at room temperature for 3 h, then...

Embodiment 2

[0035] Preparation of MIL-101: Add 4.000g of chromium nitrate nonahydrate and 1.660g of terephthalic acid into 60ml of aqueous solution A, stir at room temperature for 0.5h, then add 2ml of hydrofluoric acid solution B into mixed solution A, Mix and stir for 0.5h, transfer the mixed solution C to the polytetrafluoroethylene reactor liner, then put the polytetrafluoroethylene reactor liner into the high-pressure reactor, react at 220°C for 12h under high temperature and high pressure, and then put the solution Filter through a 250-mesh stainless steel filter, wash with DMF and deionized water three times, and vacuum-dry at 150°C to finally obtain MIL-101.

[0036] Preparation of Ag@MIL-101: Add 0.1g of MIL-101 to 20mL of petroleum ether organic solution, ultrasonically mix, stir at room temperature for 30min to obtain solution A, then add 0.35ml of AgNO 3 Add dropwise to the stirring solution A, continue stirring at room temperature for 3 h, then add 0.0327 g of sodium borohydr...

Embodiment 3

[0038] Ag@MIL-101 / TiO 2 Preparation: Add 0.1g of Ag@MIL-101 to 20mL of deionized water, mix with ultrasonic, stir at room temperature for 30min to obtain solution A, then add 0.003g of TiO 2 Slowly add to the stirring solution A, continue stirring at room temperature for 6 hours, then filter the solution through a 250-mesh stainless steel filter, wash with DMF and deionized water for 3 times, and vacuum-dry at 150°C to obtain Ag @MIL-101 / TiO 2 catalyst of light. XRD patterns of different photocatalysts ( figure 1 ) indicates that the noble metal and TiO 2 The load modification did not destroy the structure of MIL-101. From the scanning electron microscope ( Figure 2A ~ Figure 2C ) and transmission electron microscopy ( Figure 3A ~ Figure 3C ) can be seen the existence of an obvious three-layer structure.

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Abstract

The invention discloses a preparation method and application of Ag@MOFs / TiO2 photocatalyst. A bi-solvent method is used herein to prepare the MOFs photocatalyst with three-layer structure by: self-assembling noble metal nanoparticles and a prepared MOF (metal organic frame) organic solvent, preparing Ag@MOFs in the presence of a reducing agent, and dispersing TiO2 evenly in an aqueous solution ofthe Ag@MOFs. The photocatalyst prepared herein is widely applicable to wastewater treatment, air purification and other fields. The photocatalyst prepared herein has the advantages that separation rate of photoproduced electron-cavity is increased, composite pollutants can be synchronously treated separately, and photocatalytic efficiency of the photocatalyst is finally improved; as the separationrate of photoproduced electron-cavity is increased, photocatalytic efficiency of the photocatalyst for single pollutants is also increased.

Description

technical field [0001] The invention belongs to the technical field of functional materials, in particular to an Ag@MOFs / TiO 2 Photocatalyst and its preparation method and application. Background technique [0002] In recent years, three-dimensional porous MOFs materials composed of central metal ions and organic ligands have become the focus of research due to their large specific surface area, diversity of types and structures, chemical functionalization, high porosity and adjustable structure. hot spots, which in the adsorption / storage of CO 2 , hydrogen storage, chemical separation, drug delivery and heterogeneous catalysis have shown great application prospects; at the same time, TiO 2 The representative semiconductor photocatalysis technology has the advantages of low energy consumption, mild reaction conditions, and no secondary pollution. It has good application prospects in photocatalysis, electrochemical capacitors, solar cells, and environmental pollution contro...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J31/38B01J35/10B01D53/86
Inventor 胡芸崔陪陪
Owner SOUTH CHINA UNIV OF TECH
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