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Polyaniline-modified mesoporous single-crystal titania microspheres, preparation method and application thereof

A titanium dioxide, polyaniline technology, applied in chemical instruments and methods, chemical/physical processes, physical/chemical process catalysts, etc., can solve the problems of reducing the utilization rate of light energy, the recombination rate of photogenerated electrons and holes, etc. Catalysis efficiency, increase the utilization rate of light energy, reduce the effect of load rate

Active Publication Date: 2018-10-26
HUNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there are two obvious deficiencies in titanium dioxide, that is, the material can only absorb ultraviolet light due to its wide energy band, and this part of light only accounts for 4% to 5% of the entire sunlight, which greatly reduces the light energy. Utilization efficiency, and the recombination rate of photogenerated electrons and holes is high

Method used

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  • Polyaniline-modified mesoporous single-crystal titania microspheres, preparation method and application thereof
  • Polyaniline-modified mesoporous single-crystal titania microspheres, preparation method and application thereof
  • Polyaniline-modified mesoporous single-crystal titania microspheres, preparation method and application thereof

Examples

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Embodiment 1

[0039] A kind of polyaniline modified mesoporous single crystal titanium dioxide microsphere of the present invention, such as figure 1 shown. The polyaniline-modified mesoporous single-crystal titanium dioxide microspheres include polyaniline and mesoporous single-crystal titanium dioxide microspheres, and the polyaniline is adsorbed on the surface of the mesoporous single-crystal titanium dioxide microspheres through the oxidative polymerization of aniline.

[0040] In this embodiment, the mesoporous single crystal titanium dioxide microspheres are composed of single crystal titanium dioxide with a porous structure, and the single crystal titanium dioxide with a porous structure is anatase crystal titanium dioxide. The polyaniline-modified mesoporous single-crystal titanium dioxide microspheres have a bimodal pore structure, and the pore sizes are distributed at 12nm and 34nm.

[0041] A method for preparing the polyaniline-modified mesoporous single-crystal titanium dioxid...

Embodiment 2

[0058] An application of the mesoporous single crystal titanium dioxide microspheres modified by polyaniline of the present invention in photocatalytic degradation of dyes comprises the following steps:

[0059] Take 50 mg of the polyaniline-modified mesoporous single-crystal titanium dioxide microspheres prepared in Example 1, add them to 50 mL, 10 mg / L methylene blue solution, and react under magnetic stirring for 1 h under dark conditions to achieve adsorption equilibrium, and then perform light source irradiation , the light source system uses a 300 W xenon lamp (wavelength greater than 400 nm) equipped with a UV cut filter, and a sample is taken every 15 minutes for a duration of 150 minutes. Finally, the obtained sample was centrifuged, and the supernatant was taken to measure the concentration with an ultraviolet-visible spectrophotometer.

[0060] Processing the above experimental results, the results are as follows Figure 4 shown by Figure 4 It can be seen that un...

Embodiment 3

[0062] An application of the mesoporous single crystal titanium dioxide microspheres modified by polyaniline of the present invention in photocatalytic degradation of dyes comprises the following steps:

[0063] Take 50 mg of polyaniline-modified mesoporous single-crystal titanium dioxide microspheres prepared in Example 1, add them to 50 mL, 10 mg / L rhodamine B solution, and magnetically stir the reaction for 1 h under dark conditions, so as to reach adsorption equilibrium, and then carry out The light source is irradiated. The light source system adopts a 300W xenon lamp (wavelength greater than 400nm) equipped with a UV cut-off filter. A sample is taken every 15 minutes for 120 minutes. Finally, the obtained sample was centrifuged, and the supernatant was taken to measure the concentration with an ultraviolet-visible spectrophotometer.

[0064] Processing the above experimental results, the results are as follows Figure 5 shown by Figure 5 It can be seen that under the ...

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Abstract

The invention discloses a polyaniline-modified mesoporous single-crystal titanium dioxide microsphere and its preparation method and application. The polyaniline-modified mesoporous single-crystal titanium dioxide microsphere includes polyaniline and mesoporous single-crystal titanium dioxide microspheres. Polyaniline Adsorbed on the surface of mesoporous single crystal titanium dioxide microspheres through the oxidative polymerization of aniline. The preparation method is as follows: ultrasonically disperse mesoporous single crystal titanium dioxide microspheres into a hydrochloric acid solution, add aniline, stir, add a mixture of ammonium persulfate and hydrochloric acid solution, stir, and obtain polyaniline-modified mesoporous single crystal titanium dioxide microspheres. The invention also provides the application of polyaniline-modified mesoporous single crystal titanium dioxide microspheres in photocatalytic degradation of dyes. The polyaniline-modified mesoporous single crystal titanium dioxide microspheres of the present invention have the advantages of simple preparation process, stable photocatalytic performance, good photocatalytic effect, high visible light utilization rate, and can catalyze various dye pollutants.

Description

technical field [0001] The invention belongs to the technical field of mesoporous material catalysts, and in particular relates to a polyaniline-modified mesoporous single-crystal titanium dioxide microsphere and a preparation method and application thereof. Background technique [0002] Dye pollution widely exists in various dye wastewater, which has caused serious harm to the ecological environment and public health. Moreover, most dyes have complex molecular components and are slow to degrade in natural water bodies. Because of this, the control of dye pollution has received extensive attention. The existing methods for removing dyes in wastewater mainly include: adsorption, flocculation, photocatalytic degradation, membrane separation, etc. Among them, photocatalytic degradation is widely used in the removal of dye wastewater because it can utilize the abundant solar energy on the earth. . Among them, the research on photocatalyst is an important link in the photocatal...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J31/38C02F1/30C02F101/30
CPCC02F1/30B01J31/069B01J31/38C02F2101/308C02F2305/10B01J35/51B01J35/69B01J35/647B01J35/39Y02W10/37
Inventor 汤琳邓垚成曾光明王佳佳王敬敬刘雅妮魏雪
Owner HUNAN UNIV
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