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Method for preparing nano metal loaded type composite photocatalyst through ultraviolet irradiation of supercritical fluid

A technology of supercritical fluid and supercritical flow, which is applied in the direction of metal/metal oxide/metal hydroxide catalysts, chemical instruments and methods, physical/chemical process catalysts, etc., can solve the problem of noble metal particles permeating large-area titanium oxide films evenly Problems such as deposition difficulties

Inactive Publication Date: 2019-09-17
HANGZHOU DIANZI UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The purpose of the present invention is to provide a method for preparing nanometer metal loaded materials by irradiating supercritical fluid with ultraviolet light in order to solve the defects of the prior art that precious metal particles penetrate into the pores of porous titanium oxide and that uniform deposition on large-area titanium oxide films is difficult. The method of composite photocatalyst

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  • Method for preparing nano metal loaded type composite photocatalyst through ultraviolet irradiation of supercritical fluid

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Embodiment 1

[0027] Anatase TiO 2 Nanotubes, chloroplatinic acid, and lactic acid were added to the autoclave, in which TiO 2 The mass ratio of nanotubes and chloroplatinic acid is 100:1. The reaction kettle was heated to 32 degrees Celsius, and carbon dioxide was pumped into the kettle to 10MPa. Turn on the ultrasonic device coupled to the autoclave, set the ultrasonic working mode to continuous ultrasonic, and put TiO 2 Nanotubes, chloroplatinic acid, and lactic acid are uniformly dispersed in supercritical carbon dioxide. Turn on the ultraviolet lamp, and the light enters the device through the quartz glass window inlaid on the autoclave, and shines on the particles and reagents suspended in the supercritical fluid. After 2 hours, turn off the light source, turn off the ultrasonic device, and spray the content directly through the valve to obtain a platinum-supported carbon dioxide nanotube catalyst.

Embodiment 2

[0029] First, the porous anatase TiO 2 , chloroplatinic acid, and formic acid are added to the autoclave, where TiO 2 The mass ratio to chloroplatinic acid is 1000:1. The reaction kettle was heated to 40 degrees Celsius, and carbon dioxide was pumped into the kettle to 12MPa. Turn on the stirring device coupled to the autoclave, and the porous TiO 2 , chloroplatinic acid, and formic acid are uniformly dispersed in supercritical carbon dioxide. Turn on the xenon lamp, and the light enters the device through the sapphire glass window inlaid on the autoclave, and shines on the particles and reagents suspended in the supercritical fluid. After 1 hour, turn off the light source, turn off the stirring device, slowly release the pressure of the carbon dioxide, filter and dry the content to obtain a platinum-supported porous carbon dioxide nanocatalyst.

Embodiment 3

[0031] First, flower-shaped cadmium sulfide, HAuCl 4 , ethanol is added to the autoclave, in which cadmium sulfide and HAuCl 4 The mass ratio is 100:1. The reaction kettle was heated to 40 degrees Celsius, and carbon dioxide was pumped into the kettle to 9MPa. Turn on the stirring device coupled on the autoclave, and mix flower-shaped cadmium sulfide, HAuCl 4, Ethanol uniformly dispersed in supercritical carbon dioxide. Turn on the mercury lamp, and the light enters the device through the sapphire glass window inlaid on the autoclave, and shines on the particles and reagents suspended in the supercritical fluid. After 10 hours, the light source was turned off, the stirring device was turned off, and the content was directly ejected from the valve to obtain a gold-loaded cadmium sulfide nanotube catalyst.

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Abstract

The invention belongs to the technical field of preparation of functional materials, and particularly relates to a method for preparing metal nanoparticles through ultraviolet irradiation of supercritical fluid and depositing in situ on the catalyst surface. According to the method provided by the invention, by combining the supercritical fluid technology with the photodeposition technology, nanoparticles are generated by photoreduction of a precursor; at the same time, the nanoparticles are uniformly deposited on the photocatalyst surface based on the excellent diffusion performance and transfer ability of the supercritical fluid and with the assistance of external force such as ultrasound and stirring, to prepare a metal nanoparticles-loaded type efficient photocatalyst.

Description

technical field [0001] The invention belongs to the technical field of preparation of functional materials, and in particular relates to a method for preparing a nanometer metal-loaded composite photocatalyst by irradiating a supercritical fluid with ultraviolet light. Background technique [0002] There are two ways to improve the photocatalytic activity of photocatalysts: first, by inhibiting the recombination of electrons and holes and improving the separation efficiency of photogenerated electrons and holes to improve the quantum efficiency of photocatalysts; second, by modifying the catalyst to absorb The wavelength moves to the long-wave direction, expanding the utilization efficiency of natural visible light. Previous studies have shown that the modification measure of metal particle surface deposition is an effective method to improve the activity of photocatalysts through the first route. The mechanism of metal surface deposition is that when the metal contacts the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/00B01J23/42B01J27/04
CPCB01J23/00B01J23/42B01J27/04B01J35/39
Inventor 高寒阳胡国新
Owner HANGZHOU DIANZI UNIV