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Potassium titanate-hepta-copper tetrasulfide composite material and preparation method and application thereof

A composite material, potassium titanate technology, applied in the field of materials, can solve the problems of weak reducibility, inhibition of carbon dioxide photocatalytic activity, etc., and achieve the effect of convenient operation, good application potential and good stability

Active Publication Date: 2021-12-24
WUHAN INSTITUTE OF TECHNOLOGY +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, because of its lower conduction band potential, the photogenerated electrons generated by photoexcitation exhibit weak reducibility, which also inhibits the photocatalytic activity of carbon dioxide.

Method used

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  • Potassium titanate-hepta-copper tetrasulfide composite material and preparation method and application thereof
  • Potassium titanate-hepta-copper tetrasulfide composite material and preparation method and application thereof
  • Potassium titanate-hepta-copper tetrasulfide composite material and preparation method and application thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] A preparation method of potassium titanate-heptacopper tetrasulfide composite photocatalytic material, comprising the steps of:

[0032] Synthesis of potassium titanate nanowires: Add 2mmol of titanium dioxide and 10mL of KOH solution (8mmol / L) into 20mL of water and ultrasonically dissolve to obtain a homogeneous mixed solution; the above mixed solution is subjected to hydrothermal reaction at 180°C for 12h After the reaction is completed, the potassium titanate nanowires are obtained by centrifugal washing and drying;

[0033] Synthesis of potassium titanate-copper heptasulfide nanocomposites: Add 0.07-0.55 mmol of potassium titanate nanowires and 0.04 mmol of cadmium acetate dihydrate into 20 mL of ethanol, raise the temperature to 80 °C, and then add 0.04 mmol of thio Acetamide (dissolved in 5mL ethanol) was refluxed and stirred at 80°C for 4h, then added 0.08mmol cuprous chloride (dissolved in 5mL ethanol) and continued to refluxed for 2h, washed by centrifugation ...

Embodiment 2

[0040] Synthesis of potassium titanate-copper heptasulfide nanocomposites: Add 0.55 mmol of potassium titanate nanowires and 0.04 mmol of cadmium acetate dihydrate to 20 mL of ethanol, raise the temperature to 90 ° C, and then add 0.08 mmol of thioacetamide (dissolved in 5mL ethanol) at 90°C for 2h under reflux, then added 0.08mmol cuprous chloride (dissolved in 5mL ethanol) and continued to reflux for 2h, washed by centrifugation and dried to obtain potassium titanate-heptacopper tetrasulfide composite material ;

[0041] The prepared photocatalyst was used for photocatalytic reduction of CO 2 , the results show that CH 4 The formation rate is 1.86 μmol g -1 h -1 , the CO generation rate is 0.34 μmol g -1 h -1 .

Embodiment 3

[0043] Synthesis of potassium titanate-copper heptasulfide nanocomposites: Add 0.41 mmol of potassium titanate nanowires and 0.08 mmol of cadmium acetate dihydrate to 20 mL of ethanol, heat up to 100 ° C, and then add 0.04 mmol of thioacetamide (dissolved in 5mL ethanol) at 100°C for 2h under reflux, then added 0.16mmol cuprous chloride (dissolved in 5mL ethanol) and continued to reflux for 2h, washed by centrifugation and dried to obtain potassium titanate-heptacopper tetrasulfide composite material ;

[0044] The prepared photocatalyst was used for photocatalytic reduction of CO 2 , the results show that CH 4 The formation rate is 2.40 μmol g -1 h -1 , the CO generation rate is 0.15 μmol g -1 h -1 .

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Abstract

The invention discloses a potassium titanate-hepta-copper tetrasulfide composite material which is formed by loading orthorhombic blue chalcocite type hepta-copper tetrasulfide nanoparticles with the particle size of 10-30 nm on the surface of a potassium titanate nanowire. The preparation method comprises the following steps: adding a certain amount of titanium dioxide and a potassium hydroxide solution into water, uniformly mixing, carrying out a hydrothermal reaction, and carrying out centrifugal washing and drying after the hydrothermal reaction is ended, so as to obtain the potassium titanate nanowire; adding the obtained potassium titanate nanowire and a certain amount of cadmium acetate dihydrate into ethanol, adding thioacetamide under the condition of heating and stirring to react for a period of time, then adding cuprous chloride to react, and then carrying out centrifugal washing and drying to obtain a potassium titanate-hepta-copper tetrasulfide composite material. According to the invention, small-sized copper tetrasulfide particles are distributed on the potassium titanate nanowire, the load of the copper tetrasulfide is beneficial to effective separation of photo-induced electrons and holes, and the reduction performance of the photo-induced electrons is fully exerted to realize effective photo-reduction of carbon dioxide to generate methane and carbon monoxide.

Description

technical field [0001] The invention belongs to the technical field of materials, and in particular relates to a potassium titanate-copper heptasulfide composite material and a preparation method and application thereof. Background technique [0002] In recent years, the application of solar energy technology has been regarded as a potential way to solve energy and environmental problems. Photocatalytic technology is widely used in carbon dioxide reduction and degradation of organic pollutants. Among them, carbon dioxide photoreduction can suppress the deterioration of the greenhouse effect caused by excessive carbon dioxide emissions on the one hand, and on the other hand provide hydrocarbon fuels that can meet energy demand. However, due to the high dissociation energy (~750kJ / mol) of the C=O bond, a high energy input is required to achieve CO 2 The conversion to hydrocarbon fuels, therefore carbon dioxide photoreduction has low efficiency, and the search for photocataly...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/04B01J35/06B01J37/30C07C1/12C07C9/04C01B32/40
CPCB01J27/04B01J37/30C07C1/12C01B32/40B01J35/39B01J35/58B01J35/40C07C9/04
Inventor 程刚杨戈邱佩陈章静熊金艳
Owner WUHAN INSTITUTE OF TECHNOLOGY
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