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Preparation method for multi-hole carbon nitride photocatalytic material doped with sulphur

A catalytic material, sulfur-doped technology, applied in chemical instruments and methods, physical/chemical process catalysts, hydrogen production, etc., can solve the problems of low photocatalytic activity, harsh synthesis conditions, cumbersome synthesis steps, etc., and achieve repeatability Good, short time-consuming, simplified reaction system effect

Inactive Publication Date: 2014-06-18
JILIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] After searching, it was found that Liu et al. published in J.Am.Chem.Soc. magazine (2010, No. 132, pp. 11642-11648) in H 2 Heating g-C at 450°C in S atmosphere 3 N 4 Synthesis of sulfur-doped g-C 3 N 4 , but the synthesis conditions are relatively harsh; Hong et al. used thiourea as a reactant in J.Mater.Chem. magazine (2012, No. 22, No. 15006-15012), SiO 2 Nanoparticles as hard templates to fabricate mesoporous g-C 3 N 4 , the synthesis steps are cumbersome; Ge et al. in Mater.Res.Bull. Magazine (2013, Issue 48, Page 3919-3925) calcined cyanamide and thiourea under nitrogen to synthesize massive sulfur-doped g-C 3 N 4 , due to the smaller specific surface area, the photocatalytic activity is lower

Method used

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  • Preparation method for multi-hole carbon nitride photocatalytic material doped with sulphur
  • Preparation method for multi-hole carbon nitride photocatalytic material doped with sulphur
  • Preparation method for multi-hole carbon nitride photocatalytic material doped with sulphur

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Effect test

Embodiment 1

[0026] Add 0.5mmol melamine and 0.5mmol cyanuric acid to 60mL deionized water, stir and disperse for 15min, then pour into a polytetrafluoroethylene reaction bottle, put the polytetrafluoroethylene reaction bottle into a constant temperature drying oven, heat at 100°C for 3h , and then cooled naturally to room temperature. The resulting suspension was filtered with a medium-speed filter paper with a pore size of 40 microns, washed three times with deionized water, and dried in a constant temperature drying oven at 60°C for 5 hours to obtain a yellow supramolecular polymer. The above solid was placed in a nitrogen atmosphere and calcined at 550° C. for 2 h (the heating rate was 15° C. / min) to obtain a solid powder of sulfur-doped porous carbon nitride photocatalytic material.

[0027] Some structural studies were carried out on the materials prepared by the above method. figure 1 Shown is the SEM picture of the supramolecular polymer precursor. It shows that the obtained supr...

Embodiment 2

[0029] Same as Example 1, except that the volume of deionized water was changed to 100 mL. The obtained sulfur-doped porous carbon nitride photocatalytic material has a specific surface area of ​​29 m 2 / g, the hydrogen production rate is 4.75mmol / (g*h), which is 7.6 and 4.75 times that of the products obtained by calcining melamine or thiocyanic acid under the same conditions, respectively.

Embodiment 3

[0031] Same as Example 1, except that the amount of thiocyanuric acid was changed to 0.4 mmol. The obtained sulfur-doped porous carbon nitride photocatalytic material has a specific surface area of ​​25 m 2 / g, the hydrogen production rate is 4mmol / (g*h), which is 6.4 and 4 times that of the products obtained by calcining melamine or thiocyanic acid under the same conditions, respectively.

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Abstract

The invention discloses a preparation method for a multi-hole carbon nitride photocatalytic material doped with sulphur, belonging to the technical field of synthesis of photocatalytic materials. The preparation method comprises the following steps of preparing a super-molecule polymer through simple hydro-thermal treatment by taking melamine and trithiocyanuric acid as a raw material and taking water as a solvent, and burning in an inert atmosphere so as to obtain a three-dimensional network sulphur-doped multi-hole carbon nitride photocatalytic material. The preparation method provided by the invention has the advantages that simplicity and easiness in preparation are achieved, a method for burning a super-molecule polymer is adopted, any template agent and a surface active agent do not need to be added, a reaction system is simplified, the cost is low, the pollution of a reagent is slight, the reaction repeatability is good, a preparation condition is mild, the time consumption of a synthetic process is short, and the requirement on equipment is high; the multi-hole carbon nitride photocatalytic material doped with sulphur has excellent catalytic activity in a catalyzing hydrogen production reaction, and the hydrogen production rate of the material is 8.3 times and 5.2times that of a product obtained by burning melamine and trithiocyanuric acid under the same condition.

Description

technical field [0001] The invention belongs to the technical field of photocatalytic material synthesis, and in particular relates to a preparation method of a sulfur-doped porous carbon nitride photocatalytic material. Background technique [0002] Human society is facing severe environmental and energy problems, and it is urgent to find solutions. Photocatalytic materials may become a breakthrough to solve these two problems. However, most photocatalytic materials only respond to ultraviolet light, which seriously restricts the use of sunlight. Therefore, it is of great significance to develop photocatalytic materials with visible light response. [0003] Carbon Nitride (g-C 3 N 4 ) is a photocatalytic material with visible light response, which has received extensive attention since its advent. Due to its excellent chemical stability and unique electronic band structure, non-toxic, metal-free and responsive to visible light, carbon nitride is widely used in photocatal...

Claims

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Application Information

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IPC IPC(8): B01J27/24B01J35/10C01B3/02
Inventor 李国栋冯亮亮邹永存刘一蒲
Owner JILIN UNIV
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