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Preparation method of zinc oxide/polyaniline composite photocatalyst

A technology of polyaniline and zinc oxide, which is applied in the field of preparation of zinc oxide/polyaniline composite photocatalyst, can solve the problems of visible light responsiveness and poor stability, and achieve the effect of improving emulsifying ability

Inactive Publication Date: 2013-06-26
ANHUI UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to design and provide a preparation method of zinc oxide / polyaniline composite photocatalyst. The zinc oxide / polyaniline composite material prepared by the method of the present invention has photocatalytic properties of ultraviolet light and visible light, and solves the problem of nano-zinc oxide photocatalysis. Catalysts have poor responsiveness and stability to visible light

Method used

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  • Preparation method of zinc oxide/polyaniline composite photocatalyst
  • Preparation method of zinc oxide/polyaniline composite photocatalyst
  • Preparation method of zinc oxide/polyaniline composite photocatalyst

Examples

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Embodiment 1

[0026] Example 1: Preparation of granular nano-zinc oxide and rod-shaped nano-zinc oxide by direct precipitation

[0027] Weigh 0.02mol of zinc acetate and 0.04mol of sodium hydroxide and dissolve them in 100ml of ethanol respectively. Under magnetic stirring, quickly pour the dissolved NaOH ethanol solution into a round-bottomed flask containing a zinc acetate ethanol solution. After stirring at 25°C for 24 hours, centrifugation, washing with absolute ethanol and deionized water for several times in turn, and vacuum drying at room temperature to obtain a white powder, which was identified by X-ray powder diffraction as zinc oxide ( figure 1 a), identified by scanning electron microscopy as granular nano-ZnO with a particle size of about 30 nm ( figure 2 a).

[0028] Weigh 0.02mol of zinc acetate and 0.04mol of sodium hydroxide and dissolve them in 100ml of ethanol respectively. Under magnetic stirring, quickly pour the NaOH ethanol solution into the round-bottomed flask con...

Embodiment 2

[0029] Example 2: Preparation of spherical flower-shaped nano-ZnO with uniform morphology and size by hydrothermal method

[0030] Synthesis of spherical flower-shaped nano-zinc oxide controlled by hydrothermal method: Weigh 0.01mol of zinc acetate, dissolve it in 10ml of deionized water, add 20ml of pre-prepared 1M NaOH solution, and mix thoroughly. The obtained mixed solution was added into a polytetrafluoroethylene-lined high-pressure reaction kettle, and 8 ml of deionized water was added, and the hydrothermal reaction was carried out at 120 ° C for 12 hours, and naturally cooled to room temperature. It was washed three times with ionized water and absolute ethanol, and dried under vacuum to obtain a white powder. The product was identified as zinc oxide by X-ray powder diffraction (see figure 1 c), identified as spherical flower-like nano-ZnO by scanning electron microscopy, the thickness of the petal-like sheet is about 20 nm, and the diameter of the ball is about 2.0 μm ...

Embodiment 3

[0031] Example 3: Surface chemical modification of nano-zinc oxide

[0032] Add 0.5g of nano-zinc oxide to the round bottom flask, then add 0.1ml of silane coupling agent KH-42, 10ml of xylene, 0.5ml of H 2 O, stir evenly, reflux at 80°C for 3h, centrifuge, wash three times with deionized water and absolute ethanol in turn, and vacuum dry at 80°C for 12h to obtain nano-zinc oxide chemically modified by silane coupling agent.

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Abstract

The invention discloses a preparation method of zinc oxide / polyaniline composite photocatalyst. The preparation method of the zinc oxide / polyaniline composite photocatalyst comprises the following steps of: respectively preparing nanometer zinc oxide by adopting a direct precipitation method and a hydrothermal method; chemically modifying the surface of the obtained nanometer zinc oxide by silane coupling agent; and compounding the surface-modified nanometer zinc oxide with polyaniline (PANI) to obtain nanometer zinc oxide / polyaniline composite photocatalyst of different morphologies through an emulsion polymerization method. The preparation method disclosed by the invention is simple to operate; the prepared composite photocatalyst has high stability and longer service life for cyclic utilization; moreover, the photocatalytic activity and efficiency of the composite material are improved, the absorption and utilization of zinc oxide to the visible light are strengthened, the utilization rate of the photocatalyst to the sunshine is greatly improved, and the visible light catalytic degradation efficiency is higher, so that the nanometer zinc oxide photocatalyst has an extensive application prospect in organic substance wastewater treatment.

Description

technical field [0001] The invention belongs to the technical field of oxide semiconductor composite photocatalysts, and particularly relates to a preparation method of a zinc oxide / polyaniline composite photocatalyst. technical background [0002] In recent years, with the intensification of environmental pollution, controlling pollution, protecting the environment, and achieving sustainable development are major issues facing human society. As an efficient and green environmental treatment technology, semiconductor photocatalysis technology has broad application prospects. [0003] Zinc oxide (ZnO) is an important broadband semiconductor photocatalyst. As a new type of functional material, nano-zinc oxide has shown its good catalytic activity. The field of catalysis technology will have good application prospects. [0004] However, nano-zinc oxide is susceptible to photocorrosion, its forbidden band gap width is 3.4eV, the wavelength range of solar light absorption is nar...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J31/26C02F1/30
CPCY02W10/37
Inventor 李村吴振玉李奉杰朱维菊方敏
Owner ANHUI UNIVERSITY
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