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Preparation method and application of cubic-structure CuCr2O4 visible light photocatalyst

A cubic structure and photocatalyst technology, which is applied in the direction of light water/sewage treatment, energy wastewater treatment, etc., can solve the problem of slow catalytic rate of photocatalysts, and achieve the effects of uniform shape, wide visible light response range, and high purity

Inactive Publication Date: 2014-11-12
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the morphology of the material is closely related to its corresponding physical and chemical properties. The traditional spherical structure CuCr 2 o 4 The catalytic rate of photocatalysts is relatively slow, and the catalytic activity needs to be further improved. Therefore, the preparation of special structure CuCr 2 o 4 The simple method and improving its catalytic activity have become one of the research hotspots in this field

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  • Preparation method and application of cubic-structure CuCr2O4 visible light photocatalyst
  • Preparation method and application of cubic-structure CuCr2O4 visible light photocatalyst
  • Preparation method and application of cubic-structure CuCr2O4 visible light photocatalyst

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Embodiment 1

[0037] A cubic CuCr 2 o 4 The preparation method of visible light photocatalyst comprises the following steps:

[0038] (1) Dissolve 5mmol copper nitrate and 10mmol chromium nitrate in 50mL deionized water, stir for 20min to obtain a mixed solution, then add 5mol / L sodium hydroxide solution to it to adjust the pH value of the mixed solution to 10.3;

[0039] (2) heating the solution obtained in step (1) to 70° C., and stirring at this temperature for 4 hours to obtain a suspension;

[0040] (3) Transfer the suspension prepared in step (2) to a reaction kettle (purchased from Guangzhou Yuhua Instrument Co., Ltd., model: KH-100), and perform a hydrothermal reaction at 180° C. for 11 hours. After the reaction, Natural cooling to room temperature;

[0041] (4) Centrifuge the product of step (3) at a centrifugation rate of 9000r / min for 12min. The precipitate obtained after centrifugation is washed with deionized water until neutral, then washed with absolute ethanol for 3 times...

Embodiment 2

[0045] A cubic CuCr 2 o 4 The preparation method of visible light photocatalyst comprises the following steps:

[0046] (1) Dissolve 2.5mmol copper nitrate and 5.5mmol chromium nitrate in 50mL deionized water, stir for 15min to obtain a mixed solution, then add 4mol / L sodium hydroxide solution to it to adjust the pH value of the mixed solution to 11;

[0047] (2) heating the solution obtained in step (1) to 80°C, and stirring at this temperature for 3.5h to obtain a suspension;

[0048] (3) Transfer the suspension prepared in step (2) to a reaction kettle, perform a hydrothermal reaction at 160° C. for 13 hours, and cool to room temperature naturally after the reaction;

[0049] (4) Centrifuge the product of step (3) at a centrifugation rate of 10000r / min for 10min. The precipitate obtained after centrifugation is washed with deionized water until neutral, then washed with absolute ethanol for 3 times, and heated at 90°C Drying for 4 hours, and grinding to obtain the precur...

Embodiment 3

[0053] A cubic CuCr 2 o 4 The preparation method of visible light photocatalyst comprises the following steps:

[0054] (1) Dissolve 5mmol copper nitrate and 9mmol chromium nitrate in 50mL deionized water, stir for 20min to obtain a mixed solution, then add 6mol / L sodium hydroxide solution to it to adjust the pH value of the mixed solution to 10;

[0055] (2) heating the solution obtained in step (1) to 75° C., and stirring at this temperature for 3 h to obtain a suspension;

[0056] (3) Transfer the suspension prepared in step (2) to a reaction kettle, perform a hydrothermal reaction at 200° C. for 9 hours, and naturally cool to room temperature after the reaction;

[0057] (4) Centrifuge the product of step (3) at a centrifugation rate of 8000r / min for 15min. The precipitate obtained after centrifugation is washed with deionized water until neutral, then washed with absolute ethanol for 3 times, at 70°C Drying for 6 hours, and grinding to obtain the precursor;

[0058] (...

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Abstract

The invention discloses a preparation method and application of a cubic-structure CuCr2O4 visible light photocatalyst. The preparation method includes the steps that cupric nitrate and chromic nitrate are dissolved in deionized water, sodium hydroxide is added to adjust the pH value of the solution, the solution is heated to a certain temperature and evenly stirred at the temperature to obtain a suspension, the suspension is moved to an autoclave for being subjected to hydrothermal reaction, after the reaction is finished, a reaction product is centrifuged, washed, dried and grinded to obtain a precursor, and the precursor is calcinated at a certain temperature for certain time to obtain the cubic-structure CuCr2O4 visible light photocatalyst. The cubic-structure CuCr2O4 visible light photocatalyst of a square crystalline phase is prepared by adopting the hydrothermal synthesis method, the preparation technology is simple and low in cost, the preparation process is free of pollutant discharge, the prepared photocatalyst is high in photocatalytic activity and capable of being effectively used for degrading organic dyestuff pollutants in waste water.

Description

technical field [0001] The invention belongs to the technical field of preparation of photocatalytic materials, in particular to a cubic structure CuCr 2 o 4 Preparation method and application of visible light photocatalyst. Background technique [0002] With the rapid development of science and technology and industry, the problem of environmental pollution faced by human beings has become increasingly prominent, and environmental protection has attracted more and more attention from people. Photocatalytic technology has played an important role in environmental protection, and the use of semiconductor materials as photocatalysts to degrade organic pollutants in the atmosphere and water is a very promising technology. Most of the current photocatalysis revolves around TiO 2 unfolded, but due to the TiO 2 It has a wide band gap, only absorbs in the ultraviolet region, and its quantum efficiency is low, thus limiting its application in the field of photocatalysis to a lar...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/86C02F1/30
CPCY02W10/37
Inventor 袁文辉刘晓霞李莉
Owner SOUTH CHINA UNIV OF TECH
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