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Preparation of Z-type BiVO4-Au/g-C3N4 photocatalytic material and application of material to photocatalytic reduction of CO2

A photocatalytic material and photocatalytic technology, applied in the field of composite materials and photocatalysis, can solve the problems of small specific surface area, easy and fast recombination of photogenerated electron-holes, low visible light utilization efficiency, etc., to optimize the reduction performance and increase the yield.

Inactive Publication Date: 2017-06-13
SOUTHEAST UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] g-C 3 N 4 Although it has good physical and chemical stability and an energy band structure with a suitable bandgap width (2.7eV), there are also shortcomings such as photogenerated electron-hole rapid recombination, small specific surface area, and low visible light utilization efficiency.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] 1. Preparation of photocatalytic materials

[0027] (1) Weigh 0.005mol of Bi(NO 3 )·5H 2 O and 0.005mol of NH 4 VO 3 respectively dissolved in 2mol / L HNO 3 and 2mol / L NaOH solution to obtain solutions A and B, then add B solution dropwise to A to form a yellow suspension, then adjust the pH of the solution to 7 with NaOH solution, stir for 30min, and then transfer the suspension to a high-pressure hydrothermal kettle In the reaction at 180°C for 10h. After it was cooled to room temperature, it was taken out and centrifuged, washed three times with deionized water and ethanol solution, and dried in vacuum at 60 °C for 8 h to obtain BiVO 4 catalyst.

[0028] (2) Weigh 5g of urea into a covered crucible, transfer it to a temperature-programmed muffle furnace, raise the temperature to 550°C at a heating rate of 4°C / min, and calcine at a constant temperature for 4h. After cooling, grind to obtain g-C 3 N 4 Powder; in g-C 3 N 4 Quality score W (Au) = 0.5% chloroaur...

Embodiment 2

[0033] 1. Preparation of photocatalytic materials

[0034] (1) Weigh 0.005mol of Bi(NO 3 )·5H 2 O and 0.005mol of NH 4 VO 3 respectively dissolved in 2mol / L HNO 3 and 2mol / L NaOH solution to obtain solutions A and B, then add B solution dropwise to A to form a yellow suspension, then adjust the pH of the solution to 8 with NaOH solution, stir for 30min, and then transfer the suspension to a high-pressure hydrothermal kettle In the reaction at 180°C for 12h. After it was cooled to room temperature, it was taken out and centrifuged, washed three times with deionized water and ethanol solution, and dried in vacuum at 60 °C for 8 h to obtain BiVO 4 catalyst.

[0035] (2) Weigh 3g of urea into a covered crucible, transfer it to a temperature-programmed muffle furnace, raise the temperature to 550°C at a heating rate of 4°C / min, and calcine at a constant temperature for 4h. After cooling, grind to obtain g-C 3 N 4 Powder; in g-C 3 N 4 Quality score W (Au) = 1% chloroauric...

Embodiment 3

[0040] 1. Preparation of photocatalytic materials

[0041] (1) Weigh 0.005mol of Bi(NO 3 )·5H 2 O and 0.005mol of NH 4 VO 3 respectively dissolved in 2mol / L HNO 3 and 2mol / L NaOH solution to obtain solutions A and B, then add B solution dropwise to A to form a yellow suspension, then adjust the pH of the solution to 9 with NaOH solution, stir for 30min, and then transfer the suspension to a high-pressure hydrothermal kettle In the reaction at 180°C for 12h. After it was cooled to room temperature, it was taken out and centrifuged, washed 4 times with deionized water and ethanol solution, and dried in vacuum at 60 °C for 9 h to obtain BiVO 4 catalyst.

[0042] (2) Weigh 7g of urea into a covered crucible, transfer it to a temperature-programmed muffle furnace, raise the temperature to 550°C at a heating rate of 4°C / min, and calcine at a constant temperature for 4h. After cooling, grind to obtain g-C 3 N 4 Powder; in g-C 3 N 4 Quality score W (Au) =1.5% chloroauric ac...

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Abstract

The invention discloses preparation of a Z-type BiVO4-Au / g-C3N4 photocatalytic material and application of the material to photocatalytic reduction of CO2. The photocatalytic material comprises the following synthesis steps: preparing g-C3N4 and BiVO4 correspondingly through a thermal polymerization urea method and a hydrothermal method, loading Au on the g-C3N4 by using an Au precursor solution through a photodeposition method, and mixing and calcining the BiVO4 and Au / g-C3N4 to obtain the Z-type BiVO4-Au / g-C3N4 photocatalytic material. The photocatalytic material is applied to a suspension system of CO2 and H2O, and CO2 can be reduced to obtain a product CH3OH by taking 300-W xenon lamp as a light source. The photocatalytic material has a high visible light absorbing property and high photo-induced electron-hole separation efficiency and has important significance in solving the problems of energy and environment by converting CO2 into hydrocarbon energy.

Description

technical field [0001] The invention belongs to the technical field of composite materials and photocatalysis, and specifically relates to a Z-type BiVO 4 -Au / g-C 3 N 4 Preparation of photocatalytic materials and their photocatalytic reduction of CO 2 for CH 3 OH application. Background technique [0002] With the rapid development of modern industry today, the CO emitted by humans into the atmosphere 2 Increasing year by year, this will have a serious impact on human production and life. CO 2 The study of utilization is not only closely related to energy production, environmental protection and resource utilization, but also has great significance to the sustainable development of the national economy and human society. with CO 2 The synthesis of high value-added organic compounds as raw materials has become a CO 2 An important research direction of utilization. In recent years, the international photocatalytic reduction of CO 2 A lot of exploratory research has ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/24B01J23/68C07C29/159C07C31/04
CPCY02P20/52B01J27/24B01J23/682C07C29/159C07C31/04
Inventor 周建成舒位欣秦一玮刘明李乃旭魏凌飞
Owner SOUTHEAST UNIV
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