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A kind of graphene/copper oxide/titanium dioxide composite material and preparation method thereof for photogenerated cathodic protection

A technology for photogenerated cathodic protection and composite materials, applied in the field of graphene/copper oxide/titanium dioxide composite materials and their preparation, can solve the problems of easy recombination of electrons and holes, large forbidden band width, and low utilization rate of visible light, etc. Reduced reaction time, improved dispersion, and prevention of sheet curling and stacking

Active Publication Date: 2020-10-09
CHANGZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] Among many semiconductor materials, titanium dioxide has the characteristics of non-toxicity and stability, so it has always been a research hotspot in the field of optoelectronics, but its band gap is large, the utilization rate of visible light is not high, and the electrons generated by excitation -Hole pairs are prone to recombination, so they need to be modified to improve their photoresponse range and electron separation efficiency

Method used

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  • A kind of graphene/copper oxide/titanium dioxide composite material and preparation method thereof for photogenerated cathodic protection
  • A kind of graphene/copper oxide/titanium dioxide composite material and preparation method thereof for photogenerated cathodic protection
  • A kind of graphene/copper oxide/titanium dioxide composite material and preparation method thereof for photogenerated cathodic protection

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] (1) Add 7.03g of copper nitrate and 2.33g of urea to 15mL of the dispersion containing 30mg of graphite oxide, stir well and put it into a hydrothermal kettle, and move the hydrothermal kettle to a microwave reactor. Under the microwave hydrothermal reaction for 30 minutes, after cooling to room temperature, suction filtration, the filter cake was washed and dried at 60°C, and calcined at 400°C for 2 hours in a nitrogen atmosphere to obtain a graphene / copper oxide composite material;

[0019] (2) under stirring state, in titanium tetrachloride solution (5mL, 2.5mol / L), the sodium hydroxide solution of 2.5mol / L is added dropwise, until the pH of mixed solution is 6, obtains titanium dioxide hydrate precursor, Add water to a total volume of 60mL, then add 1g of the graphene / copper oxide composite material obtained in step (1), stir for 2h, then transfer the mixed system into a hydrothermal kettle, and move the hydrothermal kettle to a microwave oven. Microwave hydrotherma...

Embodiment 2

[0021] (1) Add 7.49g of copper acetate and 2.50g of urea to 15mL of the dispersion containing 15mg of graphite oxide, stir well and put it into a hydrothermal kettle, and move the hydrothermal kettle to a microwave reactor. Under the microwave hydrothermal reaction for 60 minutes, after cooling to room temperature, suction filtration, the filter cake was washed and dried at 70°C, and calcined at 300°C for 3 hours in a nitrogen atmosphere to obtain a graphene / copper oxide composite material;

[0022] (2) Under stirring state, in titanium tetrachloride solution (5mL, 2mol / L), add the sodium hydroxide solution of 3mol / L dropwise, until the pH of mixed solution is 5, obtain titanium dioxide hydrate precursor, add water to The total volume is 60mL, then add 1.6g of the graphene / copper oxide composite material obtained in step (1), stir for 3h, then transfer the mixed system into the hydrothermal kettle, and move the hydrothermal kettle to microwave reaction Microwave hydrothermal r...

Embodiment 3

[0024] (1) Add 4.49g of copper sulfate and 1.50g of urea to 15mL of the dispersion containing 45mg of graphite oxide, stir well and put it into a hydrothermal kettle, and move the hydrothermal kettle to a microwave reactor. Under the microwave hydrothermal reaction for 10 minutes, after cooling to room temperature, suction filtration, the filter cake was washed and dried at 80°C, and calcined at 500°C for 1 hour in a nitrogen atmosphere to obtain a graphene / copper oxide composite material;

[0025] (2) Under stirring state, in titanium tetrachloride solution (5mL, 3mol / L), add the sodium hydroxide solution of 2mol / L dropwise, until the pH of mixed solution is 7, obtain titanium dioxide hydrate precursor, add water to The total volume is 60mL, then add 0.6g of the graphene / copper oxide composite material obtained in step (1), stir for 1h, then transfer the mixed system into the hydrothermal kettle, and move the hydrothermal kettle to microwave reaction Microwave hydrothermal re...

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Abstract

The invention belongs to the field of anti-corrosion nano material preparation and particularly relates to a graphene, copper oxide and titanium dioxide composite material for photoproduction cathodeprotection and a preparation method of the composite material. Under illumination, electrons on the copper oxide and titanium dioxide in the composite material can be stimulated and transferred to a stainless steel electrode, the electron density on the stainless steel electrode is increased, the electric potential is lowered, and thus stainless steel is effectively protected; and after the illumination stops, the electrons stored in the copper oxide are released and transferred to the stainless steel electrode, and thus a certain anti-corrosion effect on metal can also be achieved in a dark environment.

Description

technical field [0001] The invention belongs to the field of preparation of anti-corrosion nanometer materials, in particular to a graphene / copper oxide / titanium dioxide composite material for photogenerated cathodic protection and a preparation method thereof. Background technique [0002] Metal materials are inseparable from our daily life, but they are often accompanied by corrosion during use, which causes environmental pollution, waste of resources, seriously endangers people's work and life, and also has a certain impact on the national economy. Therefore, it is necessary to Take certain measures to protect the metal. At present, the methods of metal anticorrosion mainly include sacrificial anode method, impressed current method, photocathode protection method and so on. Among them, photogenerated cathodic protection is a new type of anti-corrosion technology developed in recent years, which has the advantages of not sacrificing the anode, not consuming electric energ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23F13/12
CPCC23F13/12
Inventor 刘文杰杜涛左士祥姚超李霞章汝钱洵
Owner CHANGZHOU UNIV
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