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Au/TiO2/metal-organic framework composite photocatalyst, preparation method therefor and application of Au/TiO2/metal-organic framework composite photocatalyst

A metal-organic framework, organic framework technology, applied in the field of composite photocatalytic material preparation and application, can solve the problems of low efficiency, limited specific surface area of ​​photocatalyst, poor adsorption of pollutants, etc., and achieves strong photocatalytic activity, low density, catalytic Stable performance

Active Publication Date: 2017-06-23
湖州肖圣科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Adsorption is a prerequisite for photocatalysis because TiO 2 The photocatalyst has a limited specific surface area and poor adsorption of pollutants, so the efficiency of photocatalytic degradation of low-concentration pollutants is low

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041](1) Dissolve polyvinylpyrrolidone in an aqueous ethanol solution with a mass fraction of ethanol of 70%, then heat it in a water bath to 63°C, and add styrene, methacryloxytrimethylammonium chloride and azobisisobutyl in sequence Nitrile, reacted for 8h under nitrogen protection, separated the product, washed to obtain polystyrene microspheres; wherein, the amount of styrene, methacryloxytrimethylammonium chloride, azobisisobutyronitrile and polyvinylpyrrolidone 15%, 0.3%, 0.15% and 2% of the total reaction system mass respectively;

[0042] (2) Mix the polystyrene microspheres prepared in step (1) with the aqueous ethanol solution with a mass fraction of ethanol of 70% according to the mass ratio of 1:10, and ultrasonically treat it for 20 minutes; then add cobalt nitrate, 1,3,5-benzene Triformic acid and triethylamine, mixed uniformly, reacted hydrothermally at 160°C for 16 hours; cooled, washed, and dried to obtain a polystyrene-cobalt metal-organic framework core-she...

Embodiment 2

[0048] (1) Dissolve polyvinylpyrrolidone in an aqueous ethanol solution with an ethanol mass fraction of 60%, then heat it in a water bath to 60°C, and add styrene, methacryloxytrimethylammonium chloride, and azobisisobutyl Nitrile, reacted for 6h under nitrogen protection, separated the product, washed to obtain polystyrene microspheres; wherein, the amount of styrene, methacryloxytrimethylammonium chloride, azobisisobutyronitrile and polyvinylpyrrolidone 10%, 0.2%, 0.1% and 1.5% of the total reaction system mass respectively;

[0049] (2) Mix the polystyrene microspheres prepared in step (1) with the aqueous ethanol solution with an ethanol mass fraction of 40% according to a mass ratio of 1:8, and ultrasonically treat for 10 minutes; then add cobalt nitrate, 1,3,5-benzene Triformic acid and triethylamine, mixed evenly, reacted hydrothermally at 130°C for 20 hours; cooled, washed, and dried to obtain a polystyrene-cobalt metal-organic framework core-shell structure; wherein,...

Embodiment 3

[0055] (1) Dissolve polyvinylpyrrolidone in an aqueous ethanol solution with an ethanol mass fraction of 80%, then heat it in a water bath to 65°C, and then add styrene, methacryloxytrimethylammonium chloride and azobisisobutyl Nitrile, reacted under nitrogen protection for 10h, separated the product, washed to obtain polystyrene microspheres; wherein, the amount of styrene, methacryloxytrimethylammonium chloride, azobisisobutyronitrile and polyvinylpyrrolidone 20%, 0.4%, 0.2% and 2.5% of the total reaction system mass respectively;

[0056] (2) Mix the polystyrene microspheres prepared in step (1) with an aqueous ethanol solution with an ethanol mass fraction of 80% according to a mass ratio of 1:20, and perform ultrasonic treatment for 30 minutes; then add cobalt nitrate, 1,3,5-benzene Triformic acid and triethylamine, mixed evenly, reacted hydrothermally at a temperature of 190°C for 12 hours; cooled, washed, and dried to obtain a polystyrene-cobalt metal-organic framework ...

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Abstract

The invention belongs to the field of preparation and application of composite photocatalytic materials and particularly relates to an Au / TiO2 / metal-organic framework composite photocatalyst and preparation and application of the Au / TiO2 / metal-organic framework composite photocatalyst. The preparation comprises the steps: preparing monodisperse cation polystyrene microspheres from styrene and methylacryloyloxy trimethylammonium chloride, which serve as monomers, and then, forming cobalt metal-organic frameworks on surfaces of the polystyrene microspheres by a layer-by-layer assembling method in a manner of taking the polystyrene microspheres as a template, so as to prepare styrene-cobalt metal-organic framework core-shell structures; carrying out hydrolysis by tetrabutyl titanate in the presence of ammonia water, so as to prepare TiO2-loaded mono-styrene-cobalt metal-organic framework core-shell structures; further, carrying out ultraviolet irradiation to photocatalytically reduce Au<3+> into Au, so as to modify TiO2; and finally, removing polystyrene cores, thereby obtaining the Au / TiO2 / metal-organic framework composite photocatalyst. The catalyst has the characteristics of low density, large specific surface area, no agglomeration, stable catalytic performance, high photocatalytic activity, and the like.

Description

technical field [0001] The invention belongs to the field of preparation and application of composite photocatalytic materials, in particular to an Au / TiO 2 / Metal organic framework composite photocatalyst and its preparation method and application. Background technique [0002] With the increasingly severe global environmental problems and the continuous improvement of environmental standards, semiconductor heterogeneous catalytic technology is playing an increasingly important role in the treatment of refractory organic pollutants and the advanced treatment of water purification due to its advantages of low cost, high efficiency, and high degree of mineralization of organic matter. role. TiO 2 (commonly known as titanium dioxide) is an important metal oxide semiconductor material, which has the characteristics of good chemical stability, strong catalytic activity, cheap and non-toxic, light corrosion resistance, low selectivity to organic pollutants and high degree of mi...

Claims

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Application Information

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IPC IPC(8): B01J31/38B01D53/86B01D53/72
CPCB01D53/8668B01J31/38B01D2257/708B01J35/39
Inventor 曹蓓蓓
Owner 湖州肖圣科技有限公司
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