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Preparation method of oxygen-vacancy-enriched multivalent cobalt in-situ doped ZnO flower-like microsphere composite photocatalyst

An in-situ doping and multi-valence technology, applied in metal/metal oxide/metal hydroxide catalysts, chemical instruments and methods, physical/chemical process catalysts, etc., can solve the problem of reducing band gap energy and photogenerated current carrying Problems such as sub-separation did not play a key role, to achieve the effect of improving degradation efficiency

Pending Publication Date: 2022-02-11
TIANJIN POLYTECHNIC UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the above examples of metal ion doping ZnO, the goal is only to modify ZnO to reduce the band gap energy, and it does not play a key role in the separation of photogenerated carriers.

Method used

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  • Preparation method of oxygen-vacancy-enriched multivalent cobalt in-situ doped ZnO flower-like microsphere composite photocatalyst
  • Preparation method of oxygen-vacancy-enriched multivalent cobalt in-situ doped ZnO flower-like microsphere composite photocatalyst
  • Preparation method of oxygen-vacancy-enriched multivalent cobalt in-situ doped ZnO flower-like microsphere composite photocatalyst

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Effect test

Embodiment 1

[0048] A method for preparing a composite photocatalyst doped with ZnO flower-like microspheres in-situ with multivalent state cobalt rich in oxygen vacancies, comprising the following steps:

[0049] First, 0.44 g of zinc acetate dihydrate, 0.025 g of cobalt acetate tetrahydrate, 0.24 g of urea and 1 g of sodium lauryl sulfate were dissolved in 80 mL of deionized water, and the above solution was magnetically stirred until the solution became clear. Transfer the resulting solution to a 100mL autoclave and react at 160°C for 12 hours. After cooling down to room temperature, the mixture solution was centrifuged with deionized water, washed three times, and dried in a vacuum oven at 40°C for 72 hours. . The above product was ground with a mortar and placed in a tube furnace. Under a nitrogen atmosphere, the temperature was raised to 400°C at 10°C / min and kept for 6 hours. Finally, the oxygen-rich multivalent state cobalt in-situ doped ZnO flower was obtained. microsphere compos...

Embodiment 2

[0051] A kind of preparation method of oxygen-rich vacancy multivalent state cobalt in-situ doped ZnO flower-shaped microsphere composite photocatalyst, the difference with embodiment 1 is: the weak base selected in the step (1) is pyridine, and all the other conditions are different Change.

Embodiment 3

[0053] A kind of preparation method of oxygen-rich vacancy multivalent cobalt in-situ doped ZnO flower-shaped microsphere composite photocatalyst, the difference from Example 1 is: the weak base selected in step (1) is triethylamine, the rest Conditions remain the same.

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Abstract

The invention belongs to the field of nano material preparation and environmental protection, and discloses a preparation method of an oxygen-vacancy-enriched multivalent cobalt in-situ doped ZnO flower-like microsphere composite photocatalyst. The preparation method comprises the following steps: (1) dissolving cobalt acetate, zinc acetate, organic weak base and a template agent in deionized water, placing the solution in a reaction kettle which is 1.25-2 times of the total volume of the solution, and reacting for several hours at high temperature to prepare a catalyst precursor; (2) cleaning the catalyst precursor with deionized water, centrifugally collecting a solid product, and drying in a vacuum drying oven at 40 DEG C for 72 hours; and (3) calcining the dried catalyst precursor at a high temperature in a tubular muffle furnace at a certain heating rate in a nitrogen environment for several hours to obtain the oxygen-vacancy-enriched multivalent cobalt in-situ doped ZnO flower-like microsphere composite photocatalyst. The photocatalyst is regular in morphology, uniform in size and high in stability, has high photocatalytic activity under visible light, and has good practical value and application prospects.

Description

technical field [0001] The invention relates to the field of preparation of semiconductor photocatalytic materials, more specifically, to a preparation method of multivalent cobalt in-situ doped ZnO flower-shaped microsphere composite photocatalyst and the composite photocatalyst prepared therefrom, and its application Photocatalytic degradation of organic pollutants under visible light. Background technique [0002] As an advanced oxidation process (AOP), photocatalysis has great application potential in the fields of sewage treatment, catalytic nitrogen fixation, sterilization and antibacterial, etc. The core of the photocatalytic reaction is a semiconductor photocatalyst, which can generate reductive photogenerated electrons (e - ) and holes with oxidation capacity (h + ), accompanied by the generation of superoxide anion radicals (·O 2 - ), hydroxyl radicals (·OH) and other reactive oxygen species to achieve catalytic degradation or sterilization of organic pollutant...

Claims

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Application Information

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IPC IPC(8): B01J23/80B01J35/08C02F1/30C02F1/72C02F101/30C02F101/38
CPCB01J23/80C02F1/30C02F1/725C02F2101/30C02F2101/40C02F2101/38B01J35/51B01J35/39
Inventor 常娜谢锋王海涛贾彦军邵伟赵晓旭张昊郭建峰
Owner TIANJIN POLYTECHNIC UNIV
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