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Method for preparing g-C3N4/CdS composite catalyst through photodeposition

A g-c3n4, optical deposition technology, applied in physical/chemical process catalysts, chemical instruments and methods, catalyst activation/preparation, etc., can solve the problems of difficult design and synthesis, less particle size research, etc., and achieve excellent visible light response. properties, the preparation method is simple and convenient, and the effect of excellent photolysis water hydrogen production performance

Inactive Publication Date: 2019-08-02
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But how to fine-tune the CdS in g-C 3 N 4 At the same time, controlling the particle size of CdS with a simple scheme is rarely studied and it is difficult to design and synthesize

Method used

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  • Method for preparing g-C3N4/CdS composite catalyst through photodeposition
  • Method for preparing g-C3N4/CdS composite catalyst through photodeposition
  • Method for preparing g-C3N4/CdS composite catalyst through photodeposition

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] In this example, g-C was prepared by photodeposition 3 N 4 The method steps of / CdS composite photocatalyst are as follows:

[0038] (1) Body g-C 3 N 4 preparation of

[0039]Weigh 10g of melamine and place it in a crucible, transfer it to a muffle furnace, raise the temperature to 550°C at a heating rate of 2.3°C / min, and keep it for 4h to obtain the bulk g-C 3 N 4 ;

[0040] (2)g-C 3 N 4 Preparation of nanosheets

[0041] With the body g-C obtained in step (1) 3 N 4 The powder was placed in a crucible, and in a muffle furnace, the temperature was raised to 500°C at a rate of 5°C / min and kept for 2 hours to prepare g-C 3 N 4 Nanosheets;

[0042] (3) g-C 3 N 4 / Synthesis of CdS

[0043] With the g-C obtained in step (2) 3 N 4 Add 200mg of nanosheets to 200ml of absolute ethanol, and disperse evenly by ultrasonic to obtain g-C 3 N 4 Mixture, followed by g-C 3 N 4 1.23g of cadmium nitrate and 64mg of precipitated sulfur were respectively added to the...

Embodiment 2

[0056] The g-C prepared in the present embodiment 1 3 N 4 / CdS composite photocatalyst CS-T, carry out X-ray powder diffraction, and g-C among the embodiment 1 simultaneously 3 N 4 X-ray diffraction with pure CdS. The obtained XRD diffraction pattern is compared, such as Figure 6 Shown, the crystal diffraction peaks of CS-4 and g-C 3 N 4 Corresponding to the crystal diffraction peak of CdS, no impurity peaks appear, indicating that g-C 3 N 4 Both form a good composite catalyst with CdS.

Embodiment 3

[0058] The g-C prepared in the present embodiment 1 3 N 4 / CdS composite photocatalyst CS-T conducts experiments on photolysis of water to produce hydrogen, and tests its photocatalytic hydrogen production performance. The specific method is as follows:

[0059] Weigh 20mg of CS-T, ultrasonically disperse it into 90ml of water, add 10ml of lactic acid as a sacrificial agent solution, put it into a photochemical reaction instrument, vacuumize for half an hour, turn on the light (300W Xe lamp wavelength > 420nm) for hydrogen production test , and regularly passed through gas chromatography (MS-5A molecular sieve, TCD, N 2 as the carrier gas) to measure the production of hydrogen gas.

[0060] Such as Figure 7 As shown in a, the amount of hydrogen produced increases significantly with the prolongation of the photodeposition preparation time, and the hydrogen production reaches the highest when the photodeposition preparation time is 4 hours. When the light time was prolonged...

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Abstract

The invention discloses a method for preparing g-C3N4 / CdS composite catalyst through photodeposition. The method comprises the following steps: synthesizing a g-C3N4 nano-sheet through a tripolycyanamide polymerization, irradiating a mixed solution containing sulfur source, cadmium source and g-C3N4 after eliminating the oxygen through light irradiation, and selectively depositing CdS on the surface of the g-C3N4. By utilizing the reducing capacity of the g-C3N4 photo-induced electron, the CdS is formed in situ at a reducing site of the g-C3N4; the precise regulation and control on the location of the CdS on the g-C3N4 lamella is realized. The g-C3N4 / CdS prepared according to the invention shows excellent photolysis water-making hydrogen performance and circular use performance.

Description

technical field [0001] The invention belongs to the technical field of hydrogen production by photocatalytic decomposition of water, and specifically relates to a g-C 3 N 4 / CdS heterojunction composite photocatalyst method. Background technique [0002] It is a hot topic of current scientific research to seek new methods to solve the environmental pollution caused by the consumption of traditional energy sources. Since the pioneering work of Honda-Fujishima, attention has been paid to semiconductor photocatalysts in the past few decades. Semiconductor photocatalytic water splitting is one of the attractive ways for clean energy production. In order to efficiently utilize solar energy, photocatalysts with excellent visible light activity, high charge separation efficiency, and excellent photostability are highly desirable. [0003] Recently, graphitic carbon nitride (g-C 3 N 4 ) have attracted much attention as a novel visible-light photocatalyst due to their facile sy...

Claims

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Application Information

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IPC IPC(8): B01J27/24B01J37/34B01J37/03C01B3/04
CPCB01J27/24B01J37/344B01J37/035C01B3/042B01J35/23B01J35/399B01J35/39Y02E60/36
Inventor 陈宝梁陈雷
Owner ZHEJIANG UNIV
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