Composite catalyst with titanium dioxide coated gold nanocage structure, as well as preparation method and application of composite catalyst

A composite catalyst, gold nanocages technology, applied in metal/metal oxide/metal hydroxide catalysts, physical/chemical process catalysts, chemical instruments and methods, etc., can solve problems such as the difficulty of uniformly coating oxide layers, etc. Achieve significant degradation effect and accelerate the effect of catalytic reaction

Active Publication Date: 2014-07-30
SHANGHAI WINNER ENVIRONMENTAL TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, due to the angular effect of non-spherical metal structures such as gold nanocages, it is v...

Method used

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  • Composite catalyst with titanium dioxide coated gold nanocage structure, as well as preparation method and application of composite catalyst
  • Composite catalyst with titanium dioxide coated gold nanocage structure, as well as preparation method and application of composite catalyst
  • Composite catalyst with titanium dioxide coated gold nanocage structure, as well as preparation method and application of composite catalyst

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] (1) Preparation of Cu by ascorbic acid reduction method 2 O octahedron

[0034] Weigh CuCl in turn 2 ·H 2O0.1704g, 0.1g sodium citrate, and 3.4g PVP were dissolved in 100ml deionized water, stirred until uniform, and then 10mL NaOH solution with a concentration of 2mol / L was added dropwise and continued to stir. After 0.5 h, 10 mL of 0.6 mol / L ascorbic acid was added dropwise to the aforementioned solution. Finally, the mixed solution was matured at 30 °C for 2.5 h, cooled naturally to room temperature, centrifuged, and washed with ethanol and deionized water three times to obtain Cu 2 O octahedron.

[0035] (2)Cu 2 OTiO 2 preparation of

[0036] Weigh 0.01 g of prepared Cu 2 O octahedron into 25mL deionized water, with 0.6mL of 0.02mol / L TiF 4 Mix the aqueous solution and stir evenly for 10 minutes. The mixed solution was transferred to a 50 mL hydrothermal kettle, heated at 180 °C for 1 h, cooled naturally, centrifuged, washed with ethanol and water th...

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Abstract

The invention relates to a composite catalyst with a titanium dioxide coated gold nanocage structure, as well as a preparation method and application of the composirte catalyst. The composite catalyst comprises an inner core and an outer layer, wherein the inner core is a hollow gold nanocage with a particle size being 200-500nm; the outer layer is a nano titanium dioxide coated layer with a thickness being 5-20nm. According to the composite catalyst, a large quantity of gaps are formed in a gold nanocage layer and a TiO2 nanolayer; by virtue of the gaps, the diffusion of reactants and products can be accelerated; the composite catalyst is capable of firmly limiting the reactants in the inner space and enabling the reactants to reach the extremely-high concentration condition, thereby accelerating catalytic reaction; meanwhile, the composite catalyst is high in reaction activity, small in possibility of catalyst poisoning and capable of greatly improving the catalytic performance, so that the composite catalyst can be widely used in a plurality of composite structural materials with oxides-coated metals.

Description

technical field [0001] The present invention relates to inorganic nanomaterials and catalytic organic pollutant degradation technology, specifically, a kind of AuTiO 2 Composite catalyst with nanocage structure (gold nanocage structure coated with titanium dioxide) and its preparation method and application in catalytic reduction of 4-nitrophenol. Background technique [0002] Hollow materials have attracted the attention of many scientists because of their excellent properties such as low density, high specific surface area, low thermal expansion coefficient, and low refractive index. Among them, the research on hollow nanospheres is the most in-depth. The practical technology of nano-hollow spheres has gradually matured and gradually become practical. Due to its irregular shape and anisotropy, non-spherical hollow structure materials are increasingly used in biomedicine, targeted drug release, energy storage, etc. play an important role. [0003] Gold nanocage structure...

Claims

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Application Information

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IPC IPC(8): B01J23/52A62D3/37A62D101/28
Inventor 张建鹏吕晓明杨晓玲
Owner SHANGHAI WINNER ENVIRONMENTAL TECH
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