Preparation method for sulfur-doped carbon nitride used for production of H2 from water splitting under visible light

A technology of sulfur doping and carbon nitride, which is applied in chemical instruments and methods, inorganic chemistry, hydrogen production, etc., can solve the problems of inability to meet the requirements of trace lead determination, long preparation time and high price, and achieve Green and pollution-free output, high accuracy and easy operation

Active Publication Date: 2018-09-28
WUHAN INSTITUTE OF TECHNOLOGY
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  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Water quality Pb ​​is stipulated in the current national environmental standard detection method 2+ The determination of dithizone spectrophotometry and atomic absorption method, the detection limit is 10ug / L, but the Pb in environmental water samples 2+ The content of Pb is low, and these methods cannot meet the determination requirements of trace lead. Therefore, it is very necessary to construct a fast and sensitive Pb 2+ detection method
[0003] However, the present preparation has visible light catalytic decomposition of water to produce H 2 g-C 3 N 4 However, the general yield is very low, and the time required for preparation is long, the method is complicated, and the price is expensive, which limits its practical application.

Method used

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  • Preparation method for sulfur-doped carbon nitride used for production of H2 from water splitting under visible light
  • Preparation method for sulfur-doped carbon nitride used for production of H2 from water splitting under visible light
  • Preparation method for sulfur-doped carbon nitride used for production of H2 from water splitting under visible light

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Experimental program
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Embodiment 1

[0023] Ammonium sulfate with 5mL 0.1molL -1 h 2 SO 4 Dissolve, add melamine with a molar ratio of 1:1, stir evenly, heat to nearly dry, and then calcinate in a muffle furnace at 550°C at a heating rate of 7.5°C / min for 4 hours, then cool naturally to room temperature to obtain S-g-C 3 N 4(1) Denoted as A, its yield is 30%, while bulk g-C 3 N 4 The yield is generally only 40%. figure 1 Its TEM, AFM and XRD patterns. It can be clearly seen from the TEM image that S-g-C 3 N 4 It is in the shape of thin flakes, and the thickness of the flakes can be clearly seen in the AFM figure to be 2.5nm. The specific surface area of ​​the product measured by a specific surface area meter is 189m 2 / g. It can be seen from the XRD pattern that S-g-C 3 N 4 The characteristic peak of the (100) crystal plane formed by the 3-s-triazine structural unit constituting the plane at 13.1° disappeared, and the characteristic peak of the (002) crystal plane at 27.5° was caused by the graphite la...

Embodiment 2

[0025] Only change the ratio of ammonium sulfate to melamine to 1:1.5, 0.5:1, and the rest of the steps are the same as in Example 1. get S-g-C 3 N 4(1.5)and S-g-C 3 N 4(0.5) , denoted as B and C, respectively.

Embodiment 3

[0027] Only change the heating rate to 15°C / min, and the rest of the steps are the same as in Example 1 to obtain 15°C-S-g-C 3 N 4(1) , 420nm visible light for three hours to produce H 2 Quantity and production H 2 The rates are: 726 μmol and 4841 μmol h -1 g -1 .

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Abstract

The invention relates to the technical field of nano photocatalytic materials, and particularly discloses a preparation method for sulfur-doped carbon nitride (S-g-C3N4) used for production of H2 by water splitting under visible light. The method comprises the following steps: 1) weighing an appropriate amount of an ammonium salt, putting the weighed ammonium salt into a container, adding a diluteacid into the container to dissolve the ammonium salt, adding a certain ratio of melamine into the container, performing uniform mixing, and performing heating until the mixed solution is nearly dried; and 2) performing calcination for 3-6 h at temperature of 500-600 DEG C in an air atmosphere, and performing natural cooling to room temperature to obtain the high-efficiency sulfur-doped carbon nitride used for the production of the H2 by the water splitting under the visible light. The method disclosed by the invention has the advantages that a one-step heat polymerization method is adopted,the reaction is simple, rapid and easy to operate, the reaction process is green and pollution-free and has a high yield, and the method is suitable for a practical application.

Description

technical field [0001] The invention relates to the technical field of nanometer photocatalytic materials, and specifically discloses a method for decomposing aquatic H with visible light. 2 Sulfur-doped carbon nitride (S-g-C 3 N 4 ) preparation method. Background technique [0002] h 2 As a green, renewable and clean energy, it is considered to be an ideal fuel for the future. Currently more than 90% of H 2 It is obtained by steam reforming of methane and water-gas shift, and its preparation process requires a large amount of fossil energy. Therefore, the conversion of solar energy to produce H 2 It is of great significance and is a very challenging research work. Splitting water under visible light produces H 2 It is an important new energy utilization research hotspot today. Compared with thermal catalysis, photocatalysis has obvious advantages in energy saving, environmental protection and cost reduction, but the photocatalysis efficiency is still very low at pres...

Claims

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Application Information

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Patent Type & AuthorityApplications(China)
IPC IPC(8): B01J27/24C01B3/04G01N27/02G01N27/26
CPCG01N27/02G01N27/26C01B3/042B01J27/24C01B2203/1041B01J35/33B01J35/39Y02E60/36
Inventor邹菁曹媛毛冬鹏江吉周
OwnerWUHAN INSTITUTE OF TECHNOLOGY