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Z-type photocatalyst, preparation method and application thereof

A technology of photocatalyst and sulfide salt, applied in the field of photocatalysis, can solve the problems of large cadmium sulfide particle size, reduced reduction ability, poor uniformity, etc., and achieve the effect of simple and easy control, good crystallinity and low cost

Active Publication Date: 2019-07-05
TCL CORPORATION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The purpose of the present invention is to provide a Z-type photocatalyst and its preparation method, aiming to solve the problems that the cadmium sulfide prepared by the existing method has a large particle size and poor uniformity, and the oxidation and reduction ability are reduced after compounding with carbon nitride.

Method used

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  • Z-type photocatalyst, preparation method and application thereof
  • Z-type photocatalyst, preparation method and application thereof
  • Z-type photocatalyst, preparation method and application thereof

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preparation example Construction

[0040] In one embodiment, the preparation method of the Z-type photocatalyst at least includes the following steps:

[0041] S01. In C 3 N 4 Carry out coating treatment of carbon source in suspension liquid, prepare C 3 N 4 - carbon source;

[0042] S02. In an inert atmosphere, first charge the C 3 N 4 -Add mercapto acid and cadmium salt in the carbon source, then add sulfide salt thereinto, prepare C 3 N 4 - carbon source - CdS;

[0043] S03. Put the C 3 N 4 - Carbon source - CdS is calcined to convert the carbon source into a carbon layer to obtain a Z-type photocatalyst.

[0044] The technical solution of the present invention will be explained in detail below.

[0045] In step S01, C 3 N 4 of the suspension, involving C 3 N 4 The crystal form can be α-phase (α-C 3 N 4 ), β phase (β-C 3 N 4 ), cubic phase, quasi-cubic phase, graphite-like phase (g-C 3 N 4 ) in any one or several.

[0046] In step S01, C 3 N 4 The coating of the surface carbon source ...

Embodiment 1

[0083] A preparation method of Z-type photocatalyst, comprising the following steps:

[0084] S11. Take 5g of urea and put it into a 100mL porcelain crucible, cover it, and calcinate it at 500°C for 4h. After cooling to room temperature, grind the product finely in an agate mortar to obtain light yellow g-C 3 N 4 solid powder.

[0085] S12. Take 0.2000g g-C 3 N 4 , uniformly dispersed in 50mL ethanol solution, and ultrasonically dispersed for 2 hours to obtain g-C 3 N 4 Add 50 mg of dopamine hydrochloride to the suspension, and stir it magnetically for 6 hours. The suspension changes from milky white to brown, and g-C 3 N 4 - PDA suspension.

[0086] S13. To the g-C obtained in step S12 3 N 4 - Nitrogen gas was passed through the PDA suspension, 1 mL of thioglycolic acid was quickly added dropwise, stirred for 1 h, 5 mL of cadmium nitrate aqueous solution with a concentration of 1 mmol / L was slowly added, stirred for 10 min, and then 5 mL of a sodium sulfide aqueous s...

Embodiment 2

[0089] A preparation method of Z-type photocatalyst, comprising the following steps:

[0090] S21. Take 20g of melamine and put it into a 100mL porcelain crucible, cover it, and calcinate it at 600°C for 2h. After cooling to room temperature, grind the product finely in an agate mortar to obtain light yellow g-C 3 N 4 solid powder.

[0091] S22. Take 0.3000g g-C 3 N 4 , uniformly dispersed in 200mL methanol solution, and ultrasonically dispersed for 1h to obtain g-C 3 N 4 Add 200 mg of dopamine hydrochloride to the suspension, and stir it magnetically for 24 hours. The suspension changes from milky white to brown, and g-C 3 N 4 - PDA suspension.

[0092] S23. To the g-C obtained in step S22 3 N 4 - Nitrogen gas was passed through the PDA suspension, 5mL of thioglycolic acid was quickly added dropwise, stirred for 2h, 5mL of cadmium nitrate aqueous solution with a concentration of 1mmol / L was slowly added, stirred for 10min, then 5mL of a concentration of 50mmol / L sodi...

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Abstract

Relating to the field of photocatalysis technology, the invention specifically provides a Z-type photocatalyst, a preparation method and application thereof. The Z-type photocatalyst is a composite material, and includes C3N4, a carbon layer coated on the surface of C3N4 and a CdS quantum dot layer coated on the surface of the carbon layer. The preparation method includes: conducting coating treatment on a carbon source in a suspension of C3N4 to prepare a C3N4-carbon source; in an inert atmosphere, firstly adding mercapto acid and a cadmium salt into the C3N4-carbon source, then adding a sulfide salt to prepare C3N4-carbon source-CdS; and subjecting the C3N4-carbon source-CdS to calcinations treatment to convert the carbon source into a carbon layer, thus obtaining the Z-type photocatalyst. The Z-type photocatalyst provided by the invention has good performance of photodegradation of organic pollutants and photocatalytic hydrogen production.

Description

technical field [0001] The invention belongs to the technical field of photocatalysis, and in particular relates to a Z-type photocatalyst and its preparation method and application. Background technique [0002] While the rapid development of industry is continuously improving the living standards of human beings, it also causes more and more serious energy crisis and environmental pollution problems to human beings. These energy crisis and environmental pollution problems urgently need scientific and reasonable solutions. [0003] In 1972, titanium dioxide (TiO 2 ) stepped onto the stage of history, and its appearance marked that human beings only rely on the sun, water and TiO 2 The preparation of hydrogen can be realized; and with the deepening of research, scientists have discovered that TiO 2 It can not only produce hydrogen, but also degrade organic pollutants. In the subsequent research process, many materials such as bismuth vanadate, carbon nitride, and cadmium...

Claims

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Application Information

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IPC IPC(8): B01J27/24B01J35/02B01J37/08
CPCB01J27/24B01J37/084B01J35/39B01J35/50
Inventor 霍蕊
Owner TCL CORPORATION
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