Process for preparing oxidized graphene/titanium dioxide composite material with high visible-light activity at low temperature

A technology of titanium dioxide and composite materials, applied in chemical/physical processes, physical/chemical process catalysts, chemical instruments and methods, etc., can solve the problems of easy deactivation, low utilization rate of visible light, etc., and achieve convenient operation and good visible light catalytic degradation Performance, Absorption Enhanced Effect

Active Publication Date: 2013-07-24
TAIYUAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to solve the problems of low utilization rate of visible light and easy deactivation in the industrial application process of nano-titaniu

Method used

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  • Process for preparing oxidized graphene/titanium dioxide composite material with high visible-light activity at low temperature
  • Process for preparing oxidized graphene/titanium dioxide composite material with high visible-light activity at low temperature
  • Process for preparing oxidized graphene/titanium dioxide composite material with high visible-light activity at low temperature

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Experimental program
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Effect test

preparation Embodiment 1

[0028] A low-temperature preparation of a graphene oxide / titanium dioxide composite material with high visible light activity, comprising the steps of:

[0029] (1) The mass ratio of titanium precursor to graphite oxide is 1:0.05, the volume ratio of titanium precursor to deionized water is 1:15, and the volume ratio of titanium precursor to alcohol is 1:0.4, respectively Weigh / measure the precursor of titanium, graphite oxide, deionized water and alcohol;

[0030] (2) Disperse the graphite oxide weighed in step (1) in the deionized water measured in step (1), and perform ultrasonic stripping treatment for 35 min to obtain a graphene oxide aqueous dispersion;

[0031] (3) adding acid dropwise to the graphene oxide aqueous dispersion to adjust its pH value to 2 to obtain solution A;

[0032] (4) Dissolving the titanium precursor weighed in step (1) in the alcohol weighed in step (1), stirring evenly to obtain solution B;

[0033] (5) Under stirring, all solution B was added d...

preparation Embodiment 2

[0037] A low-temperature preparation of a graphene oxide / titanium dioxide composite material with high visible light activity, comprising the steps of:

[0038] (1) The mass ratio of titanium precursor to graphite oxide is 1:0.01, the volume ratio of titanium precursor to deionized water is 1:3, and the volume ratio of titanium precursor to alcohol is 1:0.9, respectively Weigh / measure the precursor of titanium, graphite oxide, deionized water and alcohol;

[0039] (2) Disperse the graphite oxide weighed in step (1) in the deionized water measured in step (1), and perform ultrasonic stripping treatment for 50 minutes to obtain a graphene oxide aqueous dispersion;

[0040] (3) adding acid dropwise to the graphene oxide aqueous dispersion to adjust its pH value to 3 to obtain solution A;

[0041] (4) Dissolving the titanium precursor weighed in step (1) in the alcohol weighed in step (1), stirring evenly to obtain solution B;

[0042] (5) Under stirring, add solution B dropwise...

preparation Embodiment 3

[0046] A low-temperature preparation of a graphene oxide / titanium dioxide composite material with high visible light activity, comprising the steps of:

[0047] (1) The mass ratio of titanium precursor to graphite oxide is 1:0.1, the volume ratio of titanium precursor to deionized water is 1:10, and the volume ratio of titanium precursor to alcohol is 1:1.5, respectively Weigh / measure the precursor of titanium, graphite oxide, deionized water and alcohol;

[0048] (2) Disperse the graphite oxide weighed in step (1) in the deionized water measured in step (1), and perform ultrasonic stripping treatment for 30 minutes to obtain a graphene oxide aqueous dispersion;

[0049] (3) Add acid dropwise to the graphene oxide aqueous dispersion, adjust its pH value to 1, and obtain solution A;

[0050] (4) Dissolving the titanium precursor weighed in step (1) in the alcohol weighed in step (1), stirring evenly to obtain solution B;

[0051] (5) Under stirring, add solution B dropwise to...

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Abstract

The invention discloses a process for preparing an oxidized graphene/titanium dioxide composite material with high visible-light activity at a low temperature, which aims to solve the problem that in the industrial application process of a nano titanium dioxide photo-catalytic oxidation technology, the visible light is low in utilization rate and easy to deactivate. According to the invention, by using the adjustability of the chemical doping diversities (varying with oxidation degrees) of oxygen-containing groups of oxidized graphene and the oxidation degree on the forbidden bandwidth of the oxidized graphene, the oxidized graphene/titanium dioxide composite material is prepared at a low temperature. The process disclosed by the invention is simple in whole synthetic process, convenient for operation, low in cost, and environment-friendly; and the prepared oxidized graphene/titanium dioxide composite material has high visible-light catalytic degradation activity, and the organic pollutant degradation capacity of the prepared oxidized graphene/titanium dioxide composite material is much higher than that of commercially-available photocatalysts at present.

Description

technical field [0001] The invention relates to the field of photocatalytic material preparation, in particular to a process for preparing a graphene oxide / titanium dioxide composite material with high visible light activity at low temperature. Background technique [0002] With the aggravation of environmental pollution and energy crisis, nano titanium dioxide (TiO 2 ) Photocatalytic oxidation technology has been widely used in various fields such as environment and energy. in TiO 2 In the process of photocatalytic degradation of organic pollutants, TiO 2 After the photocatalyst is excited by ultraviolet light, the separation of electrons and holes will occur, but most of the photogenerated electrons and holes will recombine before migrating to the surface of the catalyst, resulting in TiO 2 The photocatalytic efficiency decreases. For efficient charge transfer on the photocatalyst surface, the recombination of photogenerated electron-holes must be slowed down or elimin...

Claims

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Application Information

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IPC IPC(8): B01J21/18
Inventor 荆洁颖冯杰李文英于伟泳
Owner TAIYUAN UNIV OF TECH
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