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Heterojunction photocatalyst and preparation method thereof

A photocatalyst and heterojunction technology, applied in chemical instruments and methods, physical/chemical process catalysts, inorganic chemistry, etc., can solve the problems of photocatalytic hydrogen production efficiency and photocatalytic stability, few catalytic active centers, redox Poor ability and other problems, to achieve the effect of improving efficiency and photocatalytic stability, good redox ability, accelerating separation and transfer

Pending Publication Date: 2021-08-24
HUAIBEI NORMAL UNIVERSITY
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] Aiming at the problems of the prior art, the present invention provides an in-situ grown ternary composite photocatalyst and its preparation method and application, so as to solve the problem that the photocatalyst prepared by the current preparation method has few catalytic active centers, H 2 Low generation rate, poor redox ability, photocatalytic hydrogen production efficiency and poor photocatalytic stability

Method used

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  • Heterojunction photocatalyst and preparation method thereof
  • Heterojunction photocatalyst and preparation method thereof

Examples

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preparation example Construction

[0034] Please refer to figure 1 , the present invention provides a W 18 o 49 / g -C 3 N 4 The preparation method of composite S-type heterojunction photocatalyst comprises the following steps:

[0035] S1 provides tungsten sources, organic compounds and absolute ethanol.

[0036] The tungsten source can be tungsten hexachloride, tungsten pentachloride or tungsten pentabromide. The organic compound can be urea, thiourea, cyanamide, dicyandiamide or melamine, or a mixture formed by any combination of urea, thiourea, cyanamide, dicyandiamide and melamine.

[0037] S2 calcining the organic compound to obtain g-C 3 N 4 Nanosheets.

[0038] Fully grind the organic compound, then transfer it to a crucible, place the organic compound together with the crucible in a muffle furnace for calcination, and obtain g-C 3 N 4 Nanosheets. Wherein, the calcination treatment process is: heating to 450-650° C. and keeping the temperature for 1-4 hours. Synthetic g-C 3 N 4 For porous c...

Embodiment 1

[0049] This embodiment provides a W 18 o 49 / g -C 3 N 4 The preparation method of the composite S-type heterojunction photocatalyst comprises the following steps: fully grinding 10 g of urea and 3 g of thiourea for 30 min, and then transferring them to a 30 mL crucible. After that, it was placed in a muffle furnace and heated to 550°C for 90 minutes and kept for 2 hours to obtain ultra-thin g-C 3 N 4 Nanosheets. Take 0.24g ultra-thin g-C 3 N 4 The nanosheets were placed in 20mL of absolute ethanol and peeled off with an ultrasonic probe for 0.5h to obtain g-C 3 N 4 suspension. Dissolve 0.06 g of tungsten hexachloride in absolute ethanol under stirring conditions, and stir for 30 minutes to obtain a tungsten hexachloride solution. Add tungsten hexachloride solution dropwise to g-C 3 N 4 suspension, heated at 180°C for 2h, and then dried by centrifugation to obtain W 18 o 49 / g -C 3 N 4 Composite S-type heterojunction photocatalyst.

[0050] The W prepared in th...

Embodiment 2

[0053] The difference between this example and Example 1 is that in the preparation method: 20g of dicyandiamide and 5g of thiourea are fully ground for 30min. Place it in a muffle furnace and heat it to 450°C for 90 minutes and keep it warm for 6 hours. Take 0.21g ultra-thin g-C 3 N 4 The nanosheets were placed in 20 mL of absolute ethanol and peeled off with an ultrasonic probe for 1 h. Dissolve 0.12g of tungsten pentabromide in absolute ethanol to obtain a tungsten pentabromide solution, and add the tungsten pentabromide solution dropwise to g-C 3 N 4 The suspension was heated at 200°C for 1h.

[0054] The W prepared in this example 18 o 49 / g -C 3 N 4 The composite S-type heterojunction photocatalyst was used in photocatalytic hydrogen production, and the hydrogen production was measured after a period of photocatalytic reaction. After testing, the W prepared in this example 18 o 49 / g -C 3 N 4 The hydrogen production rate of the composite S-type heterojunctio...

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Abstract

The invention discloses a W18O49 / g-C3N4 composite S type heterojunction photocatalyst and a preparation method thereof. The preparation method comprises the following steps of S1, providing a tungsten source, an organic compound and absolute ethyl alcohol, S2, calcining the organic compound to obtain the g-C3N4 nanosheet, S3, dispersing the g-C3N4 nanosheets in the absolute ethyl alcohol, and stripping through an ultrasonic probe to obtain a g-C3N4 suspension, S4, dispersing the tungsten source into the absolute ethyl alcohol to obtain a yellow solution, and S5, dropwise adding the yellow solution into the g-C3N4 suspension, and carrying out hydrothermal reaction treatment, so as to obtain the W18O49 / g-C3N4 composite S type heterojunction photocatalyst. The g-C3N4 nanosheet is of a porous structure. In the W18O49 / g-C3N4 composite S type heterojunction photocatalyst, the mass ratio of W18O49 to g-C3N4 is (2 to 5): 10. According to the preparation method disclosed by the invention, more catalytic activity centers can be provided, W18O49 is grown on g-C3N4 in situ so as to obtain an S-type heterojunction, a W18O49 / g-C3N4 composite system is endowed with better oxidation-reduction capability, and the photocatalytic hydrogen production efficiency and photocatalytic stability are improved.

Description

technical field [0001] The invention relates to the field of environmental protection and energy functional materials, in particular to a W 18 o 49 / g -C 3 N 4 Composite S-type heterojunction photocatalyst, also involving the W 18 o 49 / g -C 3 N 4 A method for preparing a composite S-type heterojunction photocatalyst. Background technique [0002] Today, the increasingly serious global energy shortage and environmental crisis are becoming a serious threat to the long-term development of human society. Our main energy source is fossil fuel, and its massive combustion has caused energy crisis and environmental pollution. Therefore, it is important for us to find clean energy It is imperative. Solar energy is an inexhaustible source of energy, and using photocatalytic technology to convert solar energy into clean energy is a feasible strategy. However, it is difficult for a single semiconductor photocatalyst to achieve high photocatalytic activity due to the high recom...

Claims

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Application Information

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IPC IPC(8): B01J27/24C01B3/04
CPCB01J27/24C01B3/042C01B2203/0277C01B2203/1041B01J35/39Y02E60/36
Inventor 代凯黄悦张金锋
Owner HUAIBEI NORMAL UNIVERSITY
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