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A preparation method for self-assembly of one-dimensional nanorods to form chestnut shell-like three-dimensional titanium dioxide hollow microspheres with hierarchical structure

A hierarchical structure, titanium dioxide technology, applied in titanium dioxide, chemical instruments and methods, titanium oxide/hydroxide, etc., can solve the problems of complex preparation process, harsh operating conditions, unsuitable for industrialized large-scale production, etc. It is not easy to agglomerate, and the effect of enhancing the utilization rate of light

Active Publication Date: 2018-11-30
SHANDONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, hollow TiO such as 2 The preparation process is often complicated, involving multi-step reactions, and the operating conditions are harsh, which is not suitable for large-scale industrial production, and the obtained products are not self-assembled by one-dimensional materials, so there is still a lot of room for improvement in their photocatalytic activity.

Method used

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  • A preparation method for self-assembly of one-dimensional nanorods to form chestnut shell-like three-dimensional titanium dioxide hollow microspheres with hierarchical structure
  • A preparation method for self-assembly of one-dimensional nanorods to form chestnut shell-like three-dimensional titanium dioxide hollow microspheres with hierarchical structure
  • A preparation method for self-assembly of one-dimensional nanorods to form chestnut shell-like three-dimensional titanium dioxide hollow microspheres with hierarchical structure

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] A method for preparing chestnut-shell-shaped three-dimensional titanium dioxide hollow microspheres with a hierarchical structure formed by self-assembly of one-dimensional nanorods, comprising the following steps:

[0048] (1) Add n-butyl titanate to acetone at a stirring rate of 500 rpm to obtain solution A, the molar ratio of n-butyl titanate to acetone is 1:20;

[0049] (2) Add 37wt% concentrated hydrochloric acid to the above solution A at a stirring rate of 500 rpm, and continue stirring for 10 minutes to obtain solution B, the molar ratio of hydrochloric acid to titanium precursor is 5:1;

[0050] (3) Transfer solution B to a hydrothermal reactor, react at 150°C for 8 hours, and the filling ratio of the hydrothermal reactor is 60%;

[0051] (4) After the reaction is completed, the obtained solid is separated, washed three times with deionized water and ethanol, and dried at 80° C. for 12 hours;

[0052] (5) After the dried sample was calcined at 500° C. for 2 h,...

Embodiment 2

[0084] A method for preparing chestnut-shell-shaped three-dimensional titanium dioxide hollow microspheres with a hierarchical structure formed by self-assembly of one-dimensional nanorods, comprising the following steps:

[0085] (1) Add n-butyl titanate to acetone at a stirring rate of 1000 rpm to obtain solution A, and the molar ratio of n-butyl titanate to acetone is 1:20.

[0086] (2) At a stirring rate of 500 rpm, add 37 wt% concentrated hydrochloric acid to the above solution A, and continue stirring for 10 minutes to obtain solution B; the molar ratio of hydrochloric acid to titanium precursor is 5:1

[0087] (3) The solution B was transferred to a hydrothermal reactor, and reacted at 180° C. for 8 hours, and the filling ratio of the hydrothermal reactor was 70%.

[0088] (4) After the reaction, the obtained solid was separated, washed three times with deionized water and ethanol, and dried at 105° C. for 8 hours.

[0089] (5) After the dried sample was calcined at 40...

Embodiment 3

[0092] A method for preparing chestnut-shell-shaped three-dimensional titanium dioxide hollow microspheres with a hierarchical structure formed by self-assembly of one-dimensional nanorods, comprising the following steps:

[0093] (1) Add n-butyl titanate to acetone at a stirring rate of 1000 rpm to obtain solution A, the molar ratio of n-butyl titanate to acetone is 1:10;

[0094] (2) Add 37wt% concentrated hydrochloric acid to the above solution A at a stirring rate of 1000 rpm, and continue stirring for 10 minutes to obtain solution B, the molar ratio of hydrochloric acid to titanium precursor is 8:1;

[0095] (3) Transfer solution B to a hydrothermal reactor, react at 120°C for 24 hours, and the filling ratio of the hydrothermal reactor is 60%;

[0096] (4) After the reaction is completed, the obtained solid is separated, washed three times with deionized water and ethanol, and dried at 80° C. for 12 hours;

[0097] (5) After the dried sample was calcined at 400° C. for 4...

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Abstract

The invention relates to a preparing method of chestnut-shell-shaped three-dimensional titanium dioxide hollow microspheres formed through one-dimensional nanorod self-assembly and having a hierarchy structure. Acetone is condensed to produce water, butyl titanate is promoted to hydrolyze, the hydrolysis speed and the morphology are controlled by adding hydrochloric acid, three-dimensional titanium dioxide hollow microspheres are prepared by means of solvothermal and then cleaned and dried, and the chestnut-shell-shaped three-dimensional titanium dioxide hollow microspheres are prepared. The material has good recyclability besides efficient photocatalytic degradation capacity for pollutants and can be recycled many times, and the preparation process is simple and has broad application prospect in the water treatment field.

Description

technical field [0001] The invention relates to a method for preparing chestnut-shell-shaped three-dimensional titanium dioxide hollow microspheres formed by self-assembly of one-dimensional nanorods and having a hierarchical structure, and belongs to the field of preparation of environmentally friendly functional nanomaterials. Background technique [0002] Since 1792 by Japanese scientists A.Fujishima and K.Honda in the n-type semiconductor TiO 2 After the photoelectrocatalytic decomposition of water was found on the electrode, TiO 2 Due to its good chemical and physical stability, non-toxicity, low cost, and environmental friendliness, it is widely used in photocatalysis, solar fuel cells, photocatalytic hydrogen production and other fields. [0003] However, TiO 2 There are also many deficiencies, such as: TiO 2 The electron-hole recombination rate is very fast. It has been reported that the electron-hole recombination is between several p seconds, and the recombinati...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J21/06C01G23/053C02F1/30
CPCB01J21/063B01J35/004B01J35/023B01J35/08C01G23/053C01P2004/34C01P2004/61C02F1/30C02F2305/10
Inventor 孙翔徐世平高原岳敏岳钦艳高宝玉
Owner SHANDONG UNIV
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