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Cobalt titanate@nickel oxide core-shell photocatalytic material as well as preparation method and application thereof

A photocatalytic material, cobalt titanate technology, applied in the field of photocatalysis, can solve problems such as no related reports, and achieve good cycle stability, high-efficiency degradation, and large photoresponse range

Active Publication Date: 2020-02-21
QILU UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] At present, there is no relevant report on the construction of a cobalt titanate@nickel oxide hierarchical core-shell photocatalytic material

Method used

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  • Cobalt titanate@nickel oxide core-shell photocatalytic material as well as preparation method and application thereof
  • Cobalt titanate@nickel oxide core-shell photocatalytic material as well as preparation method and application thereof
  • Cobalt titanate@nickel oxide core-shell photocatalytic material as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] A kind of cobalt titanate@nickel oxide (CoTiO 3 @NiO) The preparation method of hierarchical core-shell photocatalytic material, comprises steps as follows:

[0043] (1) Preparation of spinnable precursor sol: Dissolve 0.747 g of cobalt acetate in 8 mL of methanol at room temperature and stir until dissolved; then add 1.02 g of tetra-n-butyl titanate to the above solution, and then add 4 mL of acetic acid was stirred at room temperature for 2 h to obtain a clear solution A; 0.75 g of polyvinylpyrrolidone (PVP) was dissolved in the above solution A and stirred at room temperature for 6 h to obtain the desired spinnable precursor sol.

[0044] (2) Preparation of cobalt titanate submicron ribbons

[0045]Transfer the spinnable precursor sol obtained in step (1) to a 20 mL plastic syringe connected to a stainless steel needle; the stainless steel needle with an inner diameter of 1 mm is connected to a 20 kV power supply; at 25 °C, the air relative humidity is 25% Under co...

Embodiment 2

[0050] A kind of cobalt titanate@nickel oxide (CoTiO 3 @NiO) The preparation method of hierarchical core-shell photocatalytic material, comprises steps as follows:

[0051] (1) Preparation of spinnable precursor sol: Dissolve 0.747 g of cobalt acetate in 8 mL of methanol at room temperature and stir until dissolved; then add 1.02 g of tetra-n-butyl titanate to the above solution, and then add 4 mL of acetic acid was stirred at room temperature for 2 h to obtain a clear solution A; 0.75 g of polyvinylpyrrolidone (PVP) was dissolved in the above solution A and stirred at room temperature for 6 h to obtain the desired spinnable precursor sol.

[0052] (2) Preparation of cobalt titanate submicron ribbons

[0053] Transfer the spinnable precursor sol obtained in step (1) to a 20 mL plastic syringe connected to a stainless steel needle; the stainless steel needle with an inner diameter of 1 mm is connected to a 20 kV power supply; at 25 °C, the air relative humidity is 25% Under c...

Embodiment 3

[0058] A kind of cobalt titanate@nickel oxide (CoTiO 3 @NiO) The preparation method of hierarchical core-shell photocatalytic material, comprises steps as follows:

[0059] (1) Preparation of spinnable precursor sol: Dissolve 0.747 g of cobalt acetate in 8 mL of methanol at room temperature and stir until dissolved; then add 1.02 g of tetra-n-butyl titanate to the above solution, and then add 4 mL of acetic acid was stirred at room temperature for 2 h to obtain a clear solution A; 0.75 g of polyvinylpyrrolidone (PVP) was dissolved in the above solution A and stirred at room temperature for 6 h to obtain the desired spinnable precursor sol.

[0060] (2) Preparation of cobalt titanate submicron ribbons

[0061] Transfer the spinnable precursor sol obtained in step (1) to a 20 mL plastic syringe connected to a stainless steel needle; the stainless steel needle with an inner diameter of 1 mm is connected to a 20 kV power supply; at 25 °C, the air relative humidity is 25% Under c...

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Abstract

The invention discloses a cobalt titanate@nickel oxide graded core-shell photocatalytic material as well as a preparation method and application thereof. The cobalt titanate@nickel oxide graded core-shell photocatalytic material is formed by uniformly growing ultrathin nickel oxide nanosheets on a cobalt titanate sub-micron band. The preparation method comprises the following steps: firstly, obtaining cobalt titanate precursor fiber by utilizing electrostatic spinning technology, and calcining to obtain the cobalt titanate sub-micron band; and carrying out oil bath reaction on the obtained cobalt titanate sub-micron band in an aqueous solution containing nickel acetate, hexamethylenetetramine and sodium citrate, and calcining to obtain the cobalt titanate@nickel oxide graded core-shell photocatalytic material. The obtained cobalt titanate@nickel oxide graded core-shell photocatalytic material has a large specific surface area, and can provide more active sites for photocatalytic reaction. Meanwhile, the photocatalyst has the advantages of being large in photoresponse range, high in photo-induced electron-hole separation efficiency, high in photocatalysis capacity, good in cyclingstability and the like, tetracycline can be efficiently degraded, and the application prospect in the aspect of photocatalytic degradation of antibiotics is promising.

Description

technical field [0001] The invention belongs to the technical field of photocatalysis, and relates to a cobalt titanate@nickel oxide core-shell photocatalytic material, a preparation method thereof, and an application in catalytic degradation of antibiotics under simulated sunlight conditions. Background technique [0002] Semiconductor photocatalysts have attracted widespread attention for their advantages of energy saving, environmental protection, and no secondary pollution. Their application in the degradation of antibiotics is of great significance to solving water environmental pollution. [0003] Cobalt titanate is a classic perovskite oxide, which is widely used in the field of photocatalysis because of its narrow band gap, suitable electronic band structure and strong visible light absorption ability. However, cobalt titanate has the disadvantages of high recombination rate of photogenerated electron-hole pairs, few photocatalytic active sites, and low catalytic eff...

Claims

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Application Information

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IPC IPC(8): B01J23/755B01J35/10C02F1/30C02F101/38
CPCB01J23/755C02F1/30C02F2305/10C02F2101/38B01J35/397B01J35/61B01J35/39Y02W10/37
Inventor 郭恩言杨倩卢启芳魏明志沈建兴
Owner QILU UNIV OF TECH
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