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a cu 2 Preparation method of o/zno composite photocatalyst

A catalyst and composite light technology, applied in metal/metal oxide/metal hydroxide catalysts, physical/chemical process catalysts, chemical instruments and methods, etc., can solve the problem of low utilization of sunlight, reduced photocatalytic activity, Weak absorption and other problems, to achieve the effect of good photocatalytic effect, high recycling rate and short reaction time

Active Publication Date: 2021-07-23
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] ZnO has good photosensitivity and chemical stability, and has a broad application prospect as a photocatalytic material, but it also has two major defects: (1) ZnO material has a wide band gap, and usually can only absorb sunlight in the region of sunlight. In the ultraviolet region, the absorption in the visible region is very weak, and the utilization rate of sunlight is not high
(2) The photogenerated carriers generated by ZnO photocatalytic materials are easily coupled after being stimulated by light, which reduces the photocatalytic activity
[0004] Cuprous oxide, as a P-type semiconductor with a band gap of 2.2 eV, has been used in photolysis of water to produce hydrogen and photocatalytic degradation of pollutants due to the separation of electrons and holes in the visible light range and its non-toxic properties. Important applications, but the electrons and holes of cuprous oxide are very easy to recombine

Method used

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  • a cu <sub>2</sub> Preparation method of o/zno composite photocatalyst
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  • a cu <sub>2</sub> Preparation method of o/zno composite photocatalyst

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Embodiment 1

[0031] Embodiment 1: a kind of Cu 2 The preparation method of O / ZnO composite photocatalyst, concrete steps are as follows:

[0032] (1) Dissolve copper salt and zinc salt in water to obtain a mixed salt solution; the copper salt is Cu(NO 3 ) 2 , the zinc salt is Zn(NO 3 ) 2 , the molar ratio of copper in the copper salt and zinc in the zinc salt is 1:1, and the concentration of zinc ions in the mixed salt solution is 0.10mol / L;

[0033] (2) Under stirring conditions, drop the precipitant solution (alkaline solution) into the mixed salt solution in step (1) to react until the pH value is 7~7.5 to obtain a reaction system. The reaction system is ultrasonically treated for 15 minutes, and stirred for 2 hours. ; Filter to obtain the copper-zinc hydroxide solid; Wherein the precipitant solution (alkaline solution) is a sodium hydroxide solution, and the concentration of the sodium hydroxide solution is 0.5120mol / L; the titration rate of the precipitant solution (alkaline solut...

Embodiment 2

[0038] Embodiment 2: a kind of Cu 2 The preparation method of O / ZnO composite photocatalyst, concrete steps are as follows:

[0039] (1) Dissolve copper salt and zinc salt in water to obtain a mixed salt solution; the copper salt is Cu(NO 3 ) 2 , the zinc salt is Zn(NO 3 ) 2, the molar ratio of copper in the copper salt and zinc in the zinc salt is 0.625:1, and the concentration of zinc ions in the mixed salt solution is 0.101mol / L;

[0040] (2) Under stirring conditions, add the precipitant solution (alkaline solution) drop by drop into the mixed salt solution in step (1) to react until the pH value is 7~7.5 to obtain a reaction system, and the reaction system is ultrasonically treated for 30 minutes, and then stirred 1.5 h; filter to obtain copper-zinc hydroxide precipitation; wherein the precipitant solution (alkaline solution) is ammonia water, the concentration of ammonia water is 0.5075mol / L; the titration rate of the precipitant solution (alkaline solution) is 2-4 d...

Embodiment 3

[0045] Embodiment 3: a kind of Cu 2 The preparation method of O / ZnO composite photocatalyst, concrete steps are as follows:

[0046] (1) Dissolve copper salt and zinc salt in water to obtain a mixed salt solution; the copper salt is Cu(CH 3 COO) 2 , the zinc salt is Zn(CH 3 COO) 2 , the mol ratio of copper in the copper salt and zinc in the zinc salt is 0.19047:1, and the concentration of zinc ions in the mixed salt solution is 0.1023 mol / L;

[0047] (2) Under stirring conditions, drop the precipitant solution (alkaline solution) dropwise into the mixed salt solution in step (1) to react until the pH value is 7~7.5 to obtain a reaction system. The reaction system is ultrasonically treated for 30 minutes, and stirred for 1.5 minutes. h; filter to obtain the copper-zinc hydroxide solid, wherein the precipitant solution (alkaline solution) is a sodium hydroxide solution, and the concentration of the sodium hydroxide solution is 0.5021mol / L; the titration rate of the precipita...

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Abstract

The present invention relates to a Cu 2 The invention discloses a method for preparing an O / ZnO composite photocatalyst, belonging to the technical field of photocatalysts. In the present invention, copper salt and zinc salt are dissolved in water to obtain a mixed salt solution; under stirring conditions, the precipitant solution is dropped dropwise into the mixed salt solution to react until the pH value is 7 to 7.5 to obtain a reaction system, and the reaction system is filtered to obtain copper Zinc hydroxide solid; add the reducing agent to the mineralizer solution to obtain a reduction-mineralization solution, add copper-zinc hydroxide solids to the reduction-mineralization solution, and react hydrothermally at a temperature of 120~160°C More than 12h, naturally cooled to room temperature, filtered to obtain Cu 2 O / ZnO solid; Cu was washed repeatedly with deionized water and absolute ethanol 2 O / ZnO solid to the pH value of the washing solution is 7~7.5, filtered to obtain Cu 2 O / ZnO powder, dry to get Cu 2 O / ZnO photocatalyst. The present invention Cu 2 The composite powder of the O / ZnO composite photocatalyst has small particles, high recycling rate, good dispersion, high photocatalytic efficiency, simple synthesis method, easy operation, short reaction time and low cost.

Description

technical field [0001] The present invention relates to a Cu 2 The invention discloses a method for preparing an O / ZnO composite photocatalyst, belonging to the technical field of photocatalysts. Background technique [0002] Wastewater discharged from production and life contains a large amount of difficult-to-degrade or toxic pollutants. It has brought serious pollution to the environment. Using semiconductor photocatalytic materials to treat sewage can directly use solar energy in the process of photocatalytic degradation, with low cost, wide application range and no secondary pollution. Semiconductor photocatalytic materials have significant advantages in the field of wastewater treatment. Currently, the most common semiconducting catalytic materials include TiO 2 , ZnO, etc. Under certain conditions, the catalytic effect of ZnO is better than that of TiO 2 , at the same time, it absorbs sunlight in a slightly wider range and has a higher photon quantum efficiency. ...

Claims

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Application Information

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IPC IPC(8): B01J23/80
CPCB01J23/80B01J35/394B01J35/39
Inventor 王开军张佳瑞胡劲王玉天
Owner KUNMING UNIV OF SCI & TECH
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