In-situ transformation preparation method of efficient C3N4-CdS composite photocatalytic material

A composite photocatalysis, c3n4-cds technology, applied in chemical instruments and methods, physical/chemical process catalysts, chemical/physical processes, etc., to achieve the effects of enhanced photocatalytic hydrogen production performance, good interfacial interaction, and uniform particle size

Inactive Publication Date: 2015-05-20
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, to the best of our knowledge, there is no study on the use of a simple and efficient in situ transformation method to synthesize uniformly loaded C on the surface 3 N 4 CdS Photocatalytic Materials to Enhance CdS Photocatalytic Activity Reported

Method used

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  • In-situ transformation preparation method of efficient C3N4-CdS composite photocatalytic material
  • In-situ transformation preparation method of efficient C3N4-CdS composite photocatalytic material
  • In-situ transformation preparation method of efficient C3N4-CdS composite photocatalytic material

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Experimental program
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Effect test

Embodiment 1

[0027] Efficient C 3 N 4 -CdS composite photocatalytic material in-situ conversion preparation process is as follows: 1) Disperse melamine in deionized water to form a uniform solution, wherein the concentration of melamine is 0.002g / mL; 2) Disperse 0.2g cadmium sulfide powder uniformly ) in 9mL melamine solution prepared in 85°C constant temperature water bath for 2h, so that melamine is evenly adsorbed on the surface of cadmium sulfide powder; Dry at a constant temperature of 80°C in the box to completely evaporate the water and finally obtain melamine-modified cadmium sulfide powder; 4) place the cadmium sulfide powder evenly loaded with melamine on the surface obtained in step 3) in a tube furnace, and in a nitrogen atmosphere Calcined at 550°C for 0.5h to obtain C 3 N 4 The content is 1wt% of C 3 N 4 -CdS composite photocatalytic material.

[0028] figure 1 C in Example 1 3 N 4 -Schematic diagram of the in situ conversion preparation process of CdS photocatalytic...

Embodiment 2

[0036] In order to examine the effect of melamine concentration on C 3 N 4 -Influence of photocatalytic performance of CdS photocatalyst, in addition to different concentration of melamine, other reaction conditions such as water bath reaction temperature (85°C), stirring time (2h), drying temperature (80°C), calcination temperature (550°C), calcination time (0.5h) etc. are all identical with embodiment 1. The results showed that: when the concentration of melamine was 0.0001g / mL, the obtained C 3 N 4 C in -CdS photocatalyst 3 N 4 The content is low, and the photocatalytic hydrogen production performance is not significantly improved, and its performance is 2310 μmol h -1 g -1 ; When the concentration of melamine was 0.0005, 0.002 and 0.05g / mL, the obtained C 3 N 4 The photocatalytic performance of -CdS photocatalyst is significantly improved, all at 5000-5500μmol h -1 g -1 ; When the concentration of melamine solution was 0.1g / mL, because the melamine solid could no...

Embodiment 3

[0038] To test the effect of water bath temperature on C 3 N 4 -Influence of photocatalytic performance of CdS photocatalyst, in addition to different water bath temperature, other reaction conditions such as melamine concentration (0.002g / mL), stirring time (2h), drying temperature (80°C), calcination temperature (550°C), calcination Time (0.5h) etc. are all identical with embodiment 1. The results show that: when the water bath temperature of the melamine solution is 30°C, the melamine solid cannot be dissolved basically, so the evenly distributed C on the surface cannot be obtained. 3 N 4 -CdS photocatalyst; when the water bath temperature of the melamine solution is 60, 85 and 100°C, a uniform melamine solution can be obtained, and thus a uniform distribution of C on the surface can be obtained 3 N 4 -CdS photocatalyst. Therefore, in C 3 N 4 - During the preparation of the CdS photocatalyst, the optimum temperature of the water bath is 60-100°C.

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Abstract

The invention relates to an in-situ transformation preparation method of an efficient C3N4-CdS composite photocatalytic material. The in-situ transformation preparation method comprises the following steps that (1) tripolycyanamide is dispersed in deionized water to form a uniform solution; (2) cadmium sulfide powder is uniformly dispersed in the tripolycyanamide solution uniformly, the cadmium sulfide powder and the tripolycyanamide solution mixed fully to achieve that tripolycyanamide is uniformly absorbed on the surface of the cadmium sulfide powder; (3) liquid obtained in Step 2 is transferred to a blast drying oven to be dried, and tripolycyanamide modified cadmium sulfide powder is obtained; and (4) the tripolycyanamide modified cadmium sulfide powder is put in a tube furnace and calcined, and the efficient C3N4-CdS composite photocatalytic material is obtained. The in-situ transformation preparation method has the benefits of being simple efficient and green when being used for synthesizing the photocatalytic material with the surface uniformly loaded with C3N4-CdS; interface transmission and sharp separation of photon-generated carriers are further facilitated; and the photocatalysis performance is further improved. In addition, the synthetic method is simple to operate, and requirements on equipment are low.

Description

technical field [0001] The present invention relates to highly efficient C 3 N 4 -In-situ conversion preparation method of CdS composite photocatalytic material. Background technique [0002] In recent years, due to the increasingly serious problems such as global energy shortage, photocatalytic materials have broad application prospects in photocatalytic water splitting to produce hydrogen. As we all know, CdS is one of the most important semiconductor photocatalytic materials. Its forbidden band width is about 2.4eV, and it can respond to visible light. (-0.51V, vs. SHE), can successfully reduce the free hydrogen ions in water to generate hydrogen, so it can play a good role in solving energy problems. However, due to the low quantum efficiency of single-component CdS, photogenerated electrons and holes are easily recombined, which greatly limits the efficiency of its photocatalytic performance. Many researchers have improved the hydrogen production performance and sta...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/24
Inventor 余火根陈丰云陈峰余家国
Owner WUHAN UNIV OF TECH
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