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a cucro 2 Sol-gel preparation method of powder

A sol-gel and powder technology, which is applied in the field of photocatalysis, can solve the problems of unfavorable coordination between citric acid and chromium and copper ions, unfavorable dispersion of copper and chromium atoms, and uneven particle size distribution, so as to achieve good hydrogen production activity by splitting water, The effect of fine particles and good crystallization integrity

Active Publication Date: 2020-12-01
HEBEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The results show that the particle size of the prepared sample is not very small, and the particle size distribution is not uniform enough. The most important thing is that the sintering phenomenon of the final sample is relatively serious, which is obviously not conducive to its performance. Adjusting the value to alkaline is not conducive to the coordination of citric acid and chromium and copper ions, and even forms copper hydroxide and chromium hydroxide precipitation, which is not conducive to the dispersion of copper and chromium atoms, making the obtained sample particles unsatisfactory.

Method used

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  • a cucro <sub>2</sub> Sol-gel preparation method of powder
  • a cucro <sub>2</sub> Sol-gel preparation method of powder

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] (1) Weigh 4g copper nitrate trihydrate (0.016556mol) and 6.624g chromium nitrate nonahydrate (0.016556mol), put it into a tall beaker, add deionized water to make copper nitrate+chromium nitrate total mass concentration is 5% aqueous solution;

[0025] (2) Weigh citric acid according to the molar ratio of citric acid and (copper nitrate + chromium nitrate) at 1.7:1, add it to the solution obtained in the previous step, and add ethylene glycol which is equimolar to citric acid, and then stir 0.5h, forming a colorless and transparent solution;

[0026] (3) Transfer the solution obtained in (2) to a water bath at 85°C, and stir continuously for 5.5 hours until a viscous liquid is formed;

[0027] (4) The viscous liquid obtained in (3) was removed from the water bath and lowered to room temperature, then 8 mL of 10 mol / L ammonia water was added thereto, and stirred at room temperature for 0.5 h;

[0028] Wherein: the mol ratio that adds ammonia in step (4) and adds nitrat...

Embodiment 2

[0036] Take the same method as described in embodiment 1 step (1)~(7) to prepare CuCrO 2 powder, the difference is that the mol ratio of citric acid to (copper nitrate+chromium nitrate) is 1.2:1, and all the other preparation conditions are the same as in Example 1. The resulting CuCrO 2 The WO prepared by powder and embodiment 1 step (8) 3 Carry out composite, prepare composite catalyst, and test the photocatalytic hydrogen production activity of composite catalyst, the proportioning, preparation method and activity test method of composite catalyst are as described in embodiment 1 step (9), record the generation amount of hydrogen to be 1.6mL .

Embodiment 3

[0038] Take the same method as described in embodiment 1 step (1)~(7) to prepare CuCrO 2 powder, the difference is that the ratio of ethylene glycol to citric acid is 0.8:1, and the rest of the preparation conditions are the same as in Example 1. The resulting CuCrO 2 The WO prepared by powder and embodiment 1 step (8) 3 Carry out composite, prepare composite catalyst, and test the photocatalytic hydrogen production activity of composite catalyst, the proportioning, preparation method and activity test method of composite catalyst are as described in embodiment 1 step (9), record the generation amount of hydrogen to be 1.9mL .

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Abstract

The present invention is a CuCrO 2 Sol-gel preparation method of powder. The method includes the following steps: prepare a mixed solution with equal moles of copper nitrate and chromium nitrate; then add citric acid and ethylene glycol into it and stir to form a colorless and transparent solution; heat in a water bath at 75°C to 90°C for 4h to 6h. Form a viscous liquid; cool to room temperature, then add ammonia solution to it, and then transfer to a water bath of 75°C to 90°C to heat to turn it into a viscous substance; vacuum dry for 18h to 40h to obtain gray powder; transfer to a tube In the furnace, roast at 300-550℃ for 0.5h-1.5h, cool down, grind, and then roast at 800-950℃ for 1h-3h under nitrogen atmosphere to obtain CuCrO 2 powder. This invention obtains CuCrO with fine particles, good dispersion, good crystal integrity and relatively uniform particle size distribution. 2 powder.

Description

technical field [0001] The invention belongs to the technical field of photocatalysis, specifically a photocatalytic material CuCrO 2 Sol-gel preparation method of powder. Background technique [0002] Photocatalysis is one of the ideal ways to solve energy and environmental problems, and the development of photocatalyst is its key technology. A large number of experimental results in the past have shown that compared with single-conductivity photocatalysts, p-n composite catalysts have more application prospects. Correspondingly, the importance of finding and preparing p-type and n-type semiconductor materials with good performance is self-evident. Relative to the large number of n-type semiconductor substances that have been developed, there are relatively few substances with p-type conductivity characteristics. CuCrO 2 It has the characteristics of p-type conductivity, can absorb visible light, and has stable performance in strong acid and strong alkali aqueous solutio...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/86B01J35/02B01J37/03B01J35/00
CPCB01J23/868B01J37/036B01J35/40B01J35/39
Inventor 王桂赟田伟松张广林王延吉赵新强
Owner HEBEI UNIV OF TECH
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