VC/g-C3N4 photocatalyst preparation method

A photocatalyst, g-c3n4 technology, applied in the field of photocatalysis, can solve the problems of photocatalytic performance degradation and achieve the effect of improving hydrogen production efficiency, low production cost and easy control of conditions

Inactive Publication Date: 2020-01-07
SHAANXI UNIV OF SCI & TECH
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  • Abstract
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Problems solved by technology

[0004] However, the rapid recombination of photogenerated electron-hole pairs greatly reduces its photocatalytic performance. Scientists continue to explore various modification methods to improve g-C 3 N 4 The efficiency of hydrogen production from photolysis of water, such as increasing defect vacancies to increase its active sites, so as to increase its hydrogen production [Junying Liu, Wenjian Fang, Zhidong Wei, et, al. Efficient photocatalytic hydrogen evolution on N-deficient g-C 3 N 4 Achieved by a molten salt post-treatment approach[J].Applied Catalysis B:Environmental,18July2018,0296-3373], or introduce other semiconductor materials to combine with it to reduce the bandgap width, so as to expand the absorption range of visible light to improve hydrogen production [Kelin He, Jun Xie, Zhuohong Yang, et, al. Earth-abundant WC nanoparticles as an active noble-metal-free co-catalyst for the highly boosted photocatalytic H 2 production over g-C 3 N 4 nanosheets under visiblelight[J].Catalysis Science&Technology,2017,7,1193]

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] 1) First, mix the mixture according to the mass ratio of dicyandiamide: ammonium bicarbonate: ammonium metavanadate=1:3:2;

[0029] 2) Grind the mixture for 60 minutes, pass through a 60-mesh sieve, put it into a porcelain boat, and heat it up from room temperature to 600°C for 3 hours in a tube furnace at a heating rate of 2°C / min;

[0030] 3) after calcination, cool naturally with the furnace, first ball mill at a speed of 200rpm for 5 hours, and then ball mill at a speed of 500rpm for 4 hours to obtain VC powder;

[0031] 4) According to the mass ratio of VC powder: citric acid: glucose: dicyandiamide=1:3:2:5, the mixture is obtained;

[0032] 5) Grind the above-mentioned mixture for 100 minutes, pass through a 60-mesh sieve, put it into a porcelain boat, and heat it up from room temperature to 450°C for 2 hours in a tube furnace at a heating rate of 2°C / min;

[0033] 6) After calcination, cool naturally with the furnace and ball mill for 4 hours at a speed of 400rp...

Embodiment 2

[0038] 1) First, mix the mixture according to the mass ratio of dicyandiamide: ammonium bicarbonate: ammonium metavanadate=1:4:3;

[0039] 2) Grind the mixture for 70 minutes, pass through a 50-mesh sieve, put it into a porcelain boat, and heat it up from room temperature to 500°C for 2 hours in a tube furnace at a heating rate of 2°C / min;

[0040] 3) after calcination, cool naturally with the furnace, first ball mill at a speed of 200rpm for 5 hours, and then ball mill at a speed of 500rpm for 4 hours to obtain VC powder;

[0041] 4) According to the mass ratio of VC powder: citric acid: glucose: dicyandiamide = 1:2:2:3, the mixture is obtained;

[0042] 5) Grind the above-mentioned mixture for 70 minutes, pass through a 50-mesh sieve, put it into a porcelain boat, and heat it up from room temperature to 500°C for 3 hours in a tube furnace at a heating rate of 5°C / min;

[0043] 6) After calcination, cool naturally with the furnace and then ball mill for 6 hours at a speed of...

Embodiment 3

[0045] 1) First, mix the mixture according to the mass ratio of dicyandiamide: ammonium bicarbonate: ammonium metavanadate=1:3:5;

[0046] 2) Grind the mixture for 65 minutes, pass through a 40-mesh sieve, put it into a porcelain boat, and heat it up from room temperature to 800°C for 2 hours in a tube furnace at a heating rate of 5°C / min;

[0047] 3) after calcination, cool naturally with the furnace, first ball mill at a speed of 300 rpm for 4 hours, and then ball mill at a speed of 600 rpm for 4 hours to obtain VC powder;

[0048] 4) According to the mass ratio of VC powder: citric acid: glucose: dicyandiamide=2:2:4:6, the mixture is obtained;

[0049] 5) Grind the above mixture for 90 minutes, pass through a 40-mesh sieve, put it into a porcelain boat, and heat it up from room temperature to 600°C for 4 hours in a tube furnace at a heating rate of 10°C / min;

[0050] 6) After calcination, cool naturally with the furnace and ball mill for 4 hours at a speed of 600rpm to obt...

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Abstract

The invention relates to a VC/g-C3N4 photocatalyst preparation method, which comprises: uniformly mixing and grinding dicyandiamide, ammonium bicarbonate and ammonium metavanadate, calcining in a tubular furnace, and carrying out ball milling to obtain VC powder; mixing and grinding the VC powder, citric acid, glucose and dicyandiamide, and calcining in a tubular furnace; and after calcining, carrying out ball milling to obtain the VC/g-C3N4 photocatalyst. According to the invention, raw materials are calcined by a tubular furnace to form a g-C3N4 matrix, and VC is uniformly attached to the matrix to form a nano-scale photocatalytic phase VC/g-C3N4 composite material; the preparation process is simple, the conditions are easy to control, the production cost is low, and the method is suitable for industrial production; and the introduced VC cocatalyst can be used for increasingactive sites during photocatalytic hydrogen production and improving the hydrogen production efficiency.

Description

technical field [0001] The invention belongs to the technical field of photocatalysis, in particular to a VC / g-C 3 N 4 Preparation method of photocatalyst. Background technique [0002] In response to the increasingly serious challenges of energy shortage and environmental pollution, the development of renewable energy and clean energy has always been the unremitting pursuit of the scientific and technological circles, and the generation of photocatalytic technology is just in line with this concept of sustainable development. The research and development of high-performance photocatalytic materials has always been an urgent topic for researchers to explore. [0003] At present, various types of photocatalysts have been developed. Since the research group of Professor Wang Xinchen of Fuzhou University confirmed that g-C 3 N 4 Since non-metallic semiconductors can catalyze water to produce hydrogen under light [Wang, X.; Maeda, K.; Thomas, A.; Takanabe, K.; Xin, G.; Carls...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/24B01J35/10C01B3/04
CPCB01J27/24B01J35/10B01J35/004C01B3/042C01B2203/0277C01B2203/1041Y02E60/36
Inventor 黄剑锋肖婷冯亮亮曹丽云冯永强赵亚娟李嘉胤牛梦凡
Owner SHAANXI UNIV OF SCI & TECH
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