Precipitating-hydrothermal preparation with high visible light catalytic activity nano CdxZn1-xS photocatalyst

A cdxzn1-xs, photocatalyst technology, applied in the direction of catalyst activation/preparation, physical/chemical process catalysts, chemical instruments and methods, etc., can solve the problems of unstable photocatalyst performance, limited popularization and use, and difficult control of production process, etc. Achieve the effects of improving solar energy utilization efficiency, high visible light catalytic activity, and simple preparation process

Inactive Publication Date: 2008-09-03
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Obviously, the disadvantages of poor dispersion uniformity of the system, the need to isolate oxygen, high temperature crystallization, toxic reagents or complex synthesis equipment make the Cd prepared by these methods x Z

Method used

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  • Precipitating-hydrothermal preparation with high visible light catalytic activity nano CdxZn1-xS photocatalyst
  • Precipitating-hydrothermal preparation with high visible light catalytic activity nano CdxZn1-xS photocatalyst

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Gradually drop the mixed solution containing 0.0075mol cadmium nitrate and 0.0425mol zinc nitrate into the solution containing 0.06mol sodium sulfide, keep the total volume of the solution at about 80ml, the temperature of the mixed solution is 10°C, and after stirring for 1.5h, the nano Powder precursor precipitation;

[0024] Precipitate the above-mentioned nano-powder precursor into the reactor, heat it up to 180°C at a rate of 1°C / min for hydrothermal reaction, stop heating after 24 hours of reaction, take it out after the reactor is naturally cooled to room temperature, and use deionized water Washed with absolute ethanol for 3 times, put it into a vacuum oven and dried at 80°C, and obtained nano-Cd that formed a solid solution x Zn 1-x S photocatalyst.

[0025] The nano-Cd x Zn 1-x S photocatalyst is composed of Cd 0.15 Zn 0.85 A solid solution of S. We set 10ml of 20mg / L methyl orange solution as the object of organic matter catalysis, took 20mg of the pow...

Embodiment 2

[0028] The mixed solution containing 0.005mol cadmium nitrate and 0.045mol zinc nitrate was gradually dropped into the solution containing 0.06mol sodium sulfide, so that the total volume of the solution was kept at about 80ml, the temperature of the mixed solution was 40°C, and after stirring for 2.5h, the nano Powder precursor precipitation;

[0029] Precipitate the above-mentioned nano-powder precursor into the reactor, heat it up to 200°C at a rate of 5°C / min for hydrothermal reaction, stop heating after 20 hours of reaction, take it out after the reactor is naturally cooled to room temperature, and use deionized water Washed with absolute ethanol for 3 times, put it into a vacuum oven and dried at 80°C, and obtained nano-Cd that formed a solid solution x Zn 1-x S photocatalyst. The photocatalytic performance was tested under the same experimental conditions as in Example 1.

[0030] Compared with P25 (Degussa), a photocatalytic effect similar to that of Example 1 was o...

Embodiment 3

[0032] Gradually drop the mixed solution containing 0.00625mol cadmium nitrate and 0.01875mol zinc nitrate into the solution containing 0.025mol sodium sulfide, keep the total volume of the solution at about 80ml, the temperature of the mixed solution is 15°C, and after stirring for 3 hours, nano powder is obtained body precursor precipitation;

[0033] Precipitate the above-mentioned nano-powder precursor into the reactor, heat it up to 240°C at a rate of 2°C / min for hydrothermal reaction, stop heating after 12 hours of reaction, take it out after the reactor is naturally cooled to room temperature, and use deionized water Washed with absolute ethanol for 3 times, put it into a vacuum drying oven and dried at 50 °C, and obtained nano-Cd that formed a solid solution x Zn 1-x S photocatalyst. The photocatalytic performance was tested under the same experimental conditions as in Example 1.

[0034] Compared with P25 (Degussa), a photocatalytic effect similar to that of Exampl...

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Abstract

The invention discloses a deposition-hydrothermal method for preparing a nano-sized CdxZn<1-x>S photocatalyst with high visible-light photocatalytic activity. The method includes the following steps: 1) adding dropwise a mixed solution of cadmium nitrate and zinc nitrate into a sodium sulfide solution, stirring at a medium rate for 0.5-3 hours, maintaining the temperature at 10-40 DEG C to obtain a nano-sized powdery precursor precipitate; 2) placing the nano-sized powdery precursor precipitate in a reaction vessel, raising the temperate at a rate of 1-5 DEG C/min up to 150-240 DEG C, maintaining the temperature, allowing hydrothermal reactions for 12-24 hours, stopping the hydrothermal reactions, naturally cooling down to room temperature, taking out the reaction products, washing with the deionized water and the anhydrous alcohol for 3-4 times, drying at 50-80 DEG C in a vacuum drying oven to obtain a solid solution of nano-sized CdxZn<1-x>S photocatalyst. The production method is carried out in water phase with easy operation and low cost. The product has uniform distribution of particle size, the forbidden band width and optical properties thereof are controlled by changing components, and the product has high visible-light photocatalytic activity and good prospects in industrial application.

Description

technical field [0001] The present invention relates to a kind of nanometer Cd that forms solid solution x Zn 1-x Precipitation-hydrothermal preparation method of S photocatalyst, the powder has high visible light catalytic activity. Background technique [0002] In recent decades, due to the increasingly serious environmental pollution and energy crisis, people have conducted extensive research to explore new and practical environmental protection treatment technologies. Semiconductor photocatalysis technology provides an opportunity to solve this problem, among which titanium dioxide is more researched. Due to TiO 2 The band gap is large (Eg≈3.0-3.2ev), its absorption spectrum is in the near ultraviolet region (λ<400nm), and the utilization rate of sunlight is low. It is necessary to develop a new type of photocatalyst. [0003] Semiconductor nanoparticles have attracted great attention recently, especially the study of the second group of binary chalcogenide compou...

Claims

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Application Information

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IPC IPC(8): B01J27/047B01J37/00
Inventor 王智宇祖胜男樊先平钱国栋
Owner ZHEJIANG UNIV
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