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a pd @mofs/tio 2 Photocatalyst and its preparation method and application

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: 2019-10-18
SOUTH CHINA UNIV OF TECH
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  • Summary
  • 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 a Pd@MO Fs / TiO 2 Photocatalyst and its preparation method and application

Method used

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  • a pd @mofs/tio <sub>2</sub> Photocatalyst and its preparation method and application
  • a pd @mofs/tio <sub>2</sub> Photocatalyst and its preparation method and application
  • a pd @mofs/tio <sub>2</sub> Photocatalyst and its preparation method and application

Examples

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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 Pd@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 0.404ml of H 2 PdCl 4 Add dropwise to the stirring solution A, continue stirring at room temperature for 3 ...

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 Pd@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 0.404ml of H 2 PdCl 4 Add dropwise to the stirring solution A, continue stirring at room temperature for 3 h, then add 0.0378 g of sodium bo...

Embodiment 3

[0038] Pd@MIL-101 / TiO 2 Preparation: Add 0.1g of Pd@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 Pd @MIL-101 / TiO 2 catalyst of light. XRD patterns of different photocatalysts ( figure 1 ) indicates that noble metals 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 Pd@MOFs / TiO 2 Preparation methods and applications of photocatalysts. The present invention adopts a dual-solvent method, first through the self-assembly of precious metal nanoparticles and the organic solvent of the prepared MOF, and then prepares Pd@MOFs in the presence of a reducing agent, and finally TiO 2 Evenly dispersed in the aqueous solution of Pd@MOFs, a MOFs photocatalyst with a three-layer structure was finally obtained. The prepared photocatalyst can be widely used in wastewater treatment, air purification and other fields. The catalyst prepared by the invention improves the separation rate of photogenerated electrons and holes, which not only enables the separation and simultaneous treatment of composite pollutants, ultimately improving its photocatalytic efficiency; but also increases the separation rate of photogenerated electrons and holes. As a result, its photocatalytic efficiency for single pollutants has also been improved.

Description

technical field [0001] The invention belongs to the technical field of functional materials, in particular to a Pd@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 control...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J31/38B01J35/10B01D53/86
CPCB01D53/86B01J31/38B01J35/60B01J35/39
Inventor 胡芸崔陪陪
Owner SOUTH CHINA UNIV OF TECH
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