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Preparation method of graphene-titanium dioxide compound photocatalyst

A titanium dioxide and photocatalyst technology, applied in physical/chemical process catalysts, chemical instruments and methods, chemical/physical processes, etc., can solve the problems of reducing the photocatalytic performance of titanium dioxide, reducing the photocatalytic performance, and low photocatalytic efficiency, etc. The effect of good photocatalytic performance, good cycle performance, good photocatalytic performance

Inactive Publication Date: 2016-08-17
NANCHANG HANGKONG UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to its inherent defects, its application in reality is limited.
Titanium dioxide is a wide bandgap semiconductor (3.0ev, anatase 3.2ev), which can only absorb ultraviolet light, and the energy of ultraviolet light accounts for only 4% of the energy of sunlight, and the utilization rate of titanium dioxide for sunlight is very low; at the same time, Ultraviolet light excites the semiconductor to generate photogenerated electron-hole pairs. The photogenerated electrons and holes interact with the organic pollutants attached to titanium dioxide and degrade them into inorganic small molecules. However, the recombination rate of photogenerated electrons and holes is much higher than that of The rate at which organic matter occurs, which greatly reduces the photocatalytic performance of titanium dioxide
[0006] At present, there are some methods for the preparation of graphene-titania composites, but most of them have low photocatalytic efficiency and poor repeatability.
For example, in the method reported in the patent (CN102350335A), the graphene-titania composite is obtained by mixing titanium dioxide nanomaterials and graphene oxide dispersion liquid and stilling, but the product titanium dioxide is easy to agglomerate and agglomerates, and is not well dispersed on the graphene sheet
Literature (Zhang H, Lv X, Li .JACS Nano 2010,4:380-386) reported that graphene was mixed with P25 (80% anatase, 20% rutile) and obtained graphene-P25 through hydrothermal reaction. composite approach, but found that P25 was poorly dispersed on graphene, resulting in poor photocatalytic performance
The patent (CN103123869A) reported a method for preparing graphene-titania composites by hydrothermal method using graphene oxide dispersion and titanium dioxide nanomaterials, but it showed poor cycle performance, and the photocatalytic performance decreased significantly after repeated use for 3 times. many

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] In the mixture of 500mg graphite powder and 2.0g sodium nitrate, add 18ml of concentrated sulfuric acid with a mass concentration of 98%, and stir the reaction at a temperature lower than 5°C for 1h; then within 0.5h, slowly add 3.0g potassium permanganate powder, react for 1.5h at a temperature lower than 5°C; raise the temperature of the above reaction system to 35°C, keep it warm for 1h, add 40ml of deionized water to the reactor after the heat preservation, and then raise the temperature to 100°C , kept warm for 15min; then the reaction product was cooled to room temperature, diluted with 70 milliliters of deionized water, and then 10 milliliters of hydrogen peroxide solution with a mass concentration of 35% was added thereto; then the reaction product was filtered, and the obtained filter cake was first Wash three times with 400 ml of hydrochloric acid with a mass concentration of 5%, and then wash three times with deionized water, and finally use a dialysis bag to ...

Embodiment 2

[0031]10 ml of a 1 mg / l graphene dispersion was prepared using the graphene oxide of Example 1.

[0032] Hexadecyltrimethylammonium bromide 5.8g was dissolved in 10 milliliters of n-pentanol and 60 milliliters of n-hexane, then 10 milliliters of graphene dispersion (1mg / ml) was supersonicated for 20 minutes with an ultrasonic cleaner to form a uniform dispersion , add to the above suspension while stirring within 30 minutes; when the solution becomes a golden emulsion, add 1.524 ml of titanium dioxide, and then keep stirring the solution, when the liquid becomes a transparent microemulsion, pour it into a high-pressure reactor , placed in an oven at 200 degrees Celsius for 6 hours; take out the reactant, place the reaction product in a rotary evaporator to remove organic reagents, then repeatedly use water and ethanol to remove surfactants and other impurities, and finally place the sample at 80 degrees Celsius to dry for 2 hours.

Embodiment 3

[0034] 20 ml (1 mg / l) of the graphene dispersion was prepared using the graphene oxide of Example 1.

[0035] Hexadecyltrimethylammonium bromide 11.6g was dissolved in 20 milliliters of n-pentanol and 120 milliliters of n-hexane, then 20 milliliters of graphene water dispersion liquid (1mg / ml) was supersonicated for 20 minutes with an ultrasonic cleaner to form a uniform dispersion solution, add it to the above suspension while stirring within 30 minutes; when the solution becomes a golden emulsion, add 3.048 ml of titanium dioxide, and then keep stirring the solution, when the liquid becomes a transparent microemulsion, pour it into the high-pressure reactor , placed in an oven at 200 degrees Celsius for 6 hours; take out the reactants, place the reaction product on a rotary evaporator to remove organic reagents, wash repeatedly with water and ethanol to remove surfactants and other impurities, and place the final sample at 80 degrees Celsius to dry for 2 hours.

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Abstract

The invention provides a preparation method of a graphene-titanium dioxide compound photocatalyst. The graphene-titanium dioxide compound photocatalyst is prepared by taking titanium trichloride, n-hexane, n-pentyl alcohol, hexadecyl trimethyl ammonium bromide and graphene oxide as raw materials through a hydrothermal-process reaction. The preparation method is simple in synthesis process, convenient to operate, low in cost and environment-friendly; and a prepared graphene-titanium dioxide compound has a good photocatalytic property and can be repeatedly used for a plurality of times, and the capability of degrading organic pollutants is higher than that of similar photocatalysts.

Description

technical field [0001] The invention relates to a preparation method of a graphene-titanium dioxide composite photocatalyst, specifically belonging to the technical field of photocatalysts. Background technique [0002] With the continuous progress and development of human technology and life, human pollution and damage to the world are becoming more and more serious. Solid pollutants can be seen everywhere on the road, and various toxic and harmful liquid pollutants flowing in rivers. , The gas pollutants that often explode in the air remind us all the time that environmental pollution has reached a very serious level, and we need to join hands to deal with pollution immediately. At present, the treatment method for water pollution is still relatively simple, and there is no product that is more commonly used and has high cost performance. As a physical adsorption method, the ordinary activated carbon adsorption method cannot solve most toxic and harmful pollution, and is ...

Claims

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Application Information

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IPC IPC(8): B01J21/18
CPCB01J21/18B01J35/39
Inventor 谢宇宋健华刘玉应方晶凌云
Owner NANCHANG HANGKONG UNIVERSITY
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