Preparation method of titanium dioxide/graphene composite photocatalyst

A graphene composite, photocatalyst technology, applied in physical/chemical process catalysts, chemical instruments and methods, chemical/physical processes and other directions, can solve the problems of large particle size of titanium dioxide, low photocatalytic efficiency, etc., and achieves a simple and efficient preparation method. Environmental protection, avoid cumbersome, and enhance the effect of absorption

Inactive Publication Date: 2012-07-11
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The present invention aims to solve the technical problems of large particle size and low photocatalytic efficiency of titanium dioxide in the compound prepared by the existing method for preparing titanium dioxide / graphene composite, and provides a preparation method of titanium dioxide / graphene composite photocatalyst

Method used

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  • Preparation method of titanium dioxide/graphene composite photocatalyst
  • Preparation method of titanium dioxide/graphene composite photocatalyst
  • Preparation method of titanium dioxide/graphene composite photocatalyst

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specific Embodiment approach 1

[0021] Specific embodiment one: the preparation method of a kind of titanium dioxide / graphene composite photocatalyst of the present embodiment is carried out according to the following steps:

[0022] 1. The mass ratio of tetrabutyl titanate to graphite oxide is 1: (0.001-0.03), the volume ratio of tetrabutyl titanate to concentrated acid is 15: (0.5-2), and the ratio of tetrabutyl titanate to graphite oxide is 1: (0.001-0.03). The volume ratio of ionized water is 15: (1~3) get tetrabutyl titanate, graphite oxide, concentrated acid and deionized water; Wherein the concentrated acid is the hydrochloric acid or the mass percent of 36%~38% by mass percent Nitric acid with a content of 65% to 68%;

[0023] 2. Dissolve the graphite oxide weighed in step 1 in an organic solvent, and perform ultrasonic dispersion treatment for 1 to 3 hours to obtain a graphene oxide dispersion;

[0024] 3. Add the tetrabutyl titanate measured in step 1 to the graphene oxide dispersion prepared in s...

specific Embodiment approach 2

[0027] Embodiment 2: This embodiment is different from Embodiment 1 in that the organic solvent described in step 2 is isopropanol or ethanol. Others are the same as in the first embodiment.

specific Embodiment approach 3

[0028] Specific embodiment three: the difference between this embodiment and specific embodiment one or two is that the mass ratio of tetrabutyl titanate and graphite oxide in step one is 1: (0.005~0.02), the ratio of tetrabutyl titanate and concentrated acid The volume ratio is 15:(1-1.5), and the volume ratio between tetrabutyl titanate and deionized water is 15:(1.5-2.5). Others are the same as in the first or second embodiment.

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Abstract

The invention relates to a preparation method of a titanium dioxide/graphene composite photocatalyst. The invention is to solve the technical problems that titanium dioxide in a titanium dioxide/graphene compound prepared by the traditional method has a large particle size and low photocatalytic efficiency. The preparation method comprises the following steps that: tetrabutyl titanate is added to a graphene oxide dispersion solution, a concentrated acid is added to adjust the acidity after ultrasonic dispersion, and then deionized water is added to continue to carry out ultrasonic treatment to obtain sol; and then the sol is transferred to a hydrothermal reaction kettle to be subjected to hydrothermal reaction, and then is washed and dried to obtain the titanium dioxide/graphene composite photocatalyst. The particle size of the titanium dioxide in the composite photocatalyst provided by the invention is 5 to 10nm, and the composite photocatalyst can be used for visible light catalytic degradation of methyl orange, and the catalytic efficiency can reach 75% within 2 hours. The titanium dioxide/graphene composite material provided by the invention can be used as a photocatalytic material, a solar cell material and a lithium ion battery cathode material.

Description

technical field [0001] The invention relates to a preparation method of a titanium dioxide composite photocatalyst. Background technique [0002] The current preparation of titanium dioxide / graphene (TiO 2 / RGO) composite photocatalyst methods, most of which are to prepare titanium dioxide first, then add graphite oxide to react to obtain titanium dioxide / graphene composites, or prepare titanium dioxide / graphite oxide composites first, and then use toxic hydrazine hydrate, etc. A reducing agent is used for reduction to obtain a titanium dioxide / graphene composite. That is, most of the current methods for preparing titanium dioxide / graphene composites are prepared step by step, and toxic hydrazine hydrate, etc. will be used as reducing agents, and the absorption band edges of the prepared composites will not appear red. Therefore, the visible light in sunlight cannot be effectively used, and only 5% of the ultraviolet light can be used for photocatalysis, and the photocatal...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J21/18
Inventor 李宣东刘晓红文爱花王炎吕祖舜韩喜江
Owner HARBIN INST OF TECH
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