Method for preparing Ag/g-C3N4 catalyst

A g-c3n4, catalyst technology, applied in physical/chemical process catalysts, chemical instruments and methods, hydrogen production, etc., can solve problems such as influence and reduce photocatalytic efficiency, and achieve simple process, good repeatability, and yield. high effect

Inactive Publication Date: 2016-01-06
JIANGSU UNIV
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Problems solved by technology

[0003] In recent years, a carbon material with a graphene-like structure, carbon nitride (g-C 3 N 4 ) Semiconductor materials have been extensively studied and reported in the field of photocatalytic water splitting to produce hydrogen; g-C 3 N 4 As a carbon-based material, it not only has the characteristics of wide source of preparation raw materials, low price, simple preparation method and easy industrialization, but also can be excited by visible light because of its forbidden band width of 2.7 eV, and can absorb visible light to decompose water to produce hydrogen; However, for a one-component photocatalyst, g-C 3 N 4 There are also many shortcomings that affect the improvement of its photocatalytic performance, especially the high electron-hole recombination rate, which seriously reduces its photocatalytic efficiency. 3 N 4 Photocatalytic performance, improving its electron-hole separation rate has always been the focus of research in this field

Method used

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  • Method for preparing Ag/g-C3N4 catalyst
  • Method for preparing Ag/g-C3N4 catalyst
  • Method for preparing Ag/g-C3N4 catalyst

Examples

Experimental program
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Effect test

Embodiment 1

[0028] A. Weigh 10 g of urea and dissolve it in 40 ml of distilled water and ultrasonicate for 20 minutes to obtain solution A.

[0029] B. Heat the obtained solution A in a water bath at 90°C with constant stirring until it evaporates to dryness quickly, and then put it into an oven at 60°C to dry to obtain sample B.

[0030] C. Put sample B in a round crucible, cover the crucible and place it horizontally in the muffle furnace, ensuring that the initial temperature of the muffle furnace is less than 80 degrees Celsius.

[0031] D. Raise the temperature of the muffle furnace to 550°C at a rate of 2.3°C per minute, and keep it at this temperature for 4 hours to obtain sample C.

[0032] E. Naturally cool to room temperature, wash sample C with deionized water and absolute ethanol three times respectively, and then dry in an oven at 60°C for 12 hours to obtain pure g-C 3 N 4 .

Embodiment 2

[0034] A. Weigh 10 g of urea and dissolve it in 40 ml of distilled water and ultrasonicate for 20 minutes to obtain solution A.

[0035] B. Add 0.03gAgNO 3 Added to solution A, and stirred in the air for 20min to obtain solution B.

[0036] C. Heat the obtained solution B in a water bath at 90°C with constant stirring until it evaporates to dryness quickly, and then dry it in an oven at 60°C to obtain sample C.

[0037] D. Put sample C in a circular crucible, cover the crucible and place it horizontally in the muffle furnace to ensure that the initial temperature of the muffle furnace is less than 80 degrees Celsius.

[0038] E. Raise the temperature of the muffle furnace to 550°C at a rate of 2.3°C per minute, and keep it at this temperature for 4 hours to obtain sample D.

[0039] F. Naturally cool to room temperature, wash sample D with deionized water and absolute ethanol 3 times respectively, and then dry in a 60°C oven for 12h to obtain Ag quantum dot-modified g-C 3 N...

Embodiment 3

[0041] A. Weigh 10 g of urea and dissolve it in 40 ml of distilled water and ultrasonicate for 20 minutes to obtain solution A.

[0042] B. Add 0.08gAgNO 3 Added to solution A, and stirred in the air for 20min to obtain solution B.

[0043]C. Heat the obtained solution B in a water bath at 90°C with constant stirring until it evaporates to dryness quickly, and then dry it in an oven at 60°C to obtain sample C.

[0044] D. Put sample C in a circular crucible, cover the crucible and place it horizontally in the muffle furnace to ensure that the initial temperature of the muffle furnace is less than 80 degrees Celsius.

[0045] E. Raise the temperature of the muffle furnace to 550°C at a rate of 2.3°C per minute, and keep it at this temperature for 4 hours to obtain sample D.

[0046] 、 Naturally cooled to room temperature, sample D was washed three times with deionized water and absolute ethanol, and then dried in an oven at 60°C for 12 h to obtain Ag quantum dot-modified g-C...

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Abstract

The invention relates to a carbon-based material g/C3N4, and particularly relates to a method for synthesizing a g/C3N4 composite material modified by Ag quantum dots through in-situ synthesis. The method is characterized by comprising the following steps of weighing urea, dissolving in distilled water, and performing ultrasonic treatment, so as to obtain a solution A; adding quantitative AgNO3 to the solution A, and stirring in the air, so as to obtain a solution B; heating the obtained solution B in water bath, continuously stirring to dry, and then drying, so as to obtain a sample C; putting the sample C into a muffle, guaranteeing the initial temperature of the muffle to be less than 80 DEG C so as to obtain porous g-C3N4, heating the muffle to 550 DEG C, and keeping the temperature for 4 hours, so as to obtain a sample D; naturally cooling to room temperature, washing and drying the sample D, so as to obtain the g-C3N4 modified by the Ag quantum dots, which can be used for hydrogen generating reaction by water photolysis.

Description

technical field [0001] The present invention relates to carbon-based materials g-C 3 N 4 , specifically refers to the synthesis of Ag quantum dot-modified g-C3N4 composite materials by in-situ growth method for photo-splitting water to hydrogen production. Background technique [0002] Since the 21st century, the excessive use of fossil energy has led to a global energy crisis and environmental crisis, so the development and utilization of green energy has become one of the most important challenges facing mankind; Hydrogen production by photo-splitting water under the action of photo-splitting water is recognized as the key to meet the challenge. This technology can realize the conversion of solar energy to chemical energy, and the pollution-free combustion process makes hydrogen have incomparable advantages in green energy; due to photo-splitting water The performance of the catalyst is directly affected by the photogenerated charge transfer, band gap structure and stabi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/24C01B3/04
CPCY02E60/36
Inventor 施伟东陈天俊胡泊李春发樊明山宋澄杰
Owner JIANGSU UNIV
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