Titanium dioxide hollow nanospheres and preparation method thereof

A technology of titanium dioxide and hollow spheres, which is applied in the field of nanomaterials, can solve problems such as unsuitability for large-scale production, reduced photocatalytic activity, and complicated process flow, so as to inhibit the growth and condensation process, improve product purity, and have high photocatalytic activity. Effect

Inactive Publication Date: 2018-10-19
NORTHEASTERN UNIV
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  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

So far, although many types of titanium dioxide hollow nanospheres have been prepared by different methods, these methods have problems such as complex process flow, high production cost, environmental pollution, low product yield, poor repeatability, and not suitable for large-scale production. , the titanium dioxide nano hollow spheres prepared by these methods have problems such as low product purity, poor crystallinity, uncontrollable crystal form, coarse particle size, uneven particle size, poor monodispersity, large particle size, small specific surface area, etc., thus greatly Reduce photocatalytic activity

Method used

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  • Titanium dioxide hollow nanospheres and preparation method thereof
  • Titanium dioxide hollow nanospheres and preparation method thereof
  • Titanium dioxide hollow nanospheres and preparation method thereof

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Embodiment 1

[0076] Such as figure 1 As shown, embodiment 1 proposes a kind of preparation method of titanium dioxide nano hollow sphere, specifically comprises the following steps:

[0077] 1. SiO2 2 ball preparation

[0078] 1.1. Mix water, ethanol and ammonia water according to the volume ratio of 5:33:1 to prepare solvent liquid I;

[0079] 1.2. Slowly add 0.6ml tetraethyl orthosilicate to the above solvent solution I, stir at room temperature for 8 hours, carry out hydrolysis reaction, then wash with ethanol several times, and dry at 70°C to obtain dispersed SiO 2 ball.

[0080] 2. TiO2 2 Precursor coating

[0081] 2.1. Mix water and ethanol according to the volume ratio of 1:120 to prepare solvent solution II;

[0082] 2.2. Add 100 mg of highly substituted hydroxypropyl cellulose dropwise into the above solvent solution II. After fully dissolving, add 0.10g of SiO prepared in step 1 2 The balls were fully dissolved to obtain a uniform mixed solution, which was recorded as sol...

Embodiment 2

[0095] Embodiment 2 proposes a kind of preparation method of titanium dioxide nanometer hollow sphere, specifically comprises the following steps:

[0096] 1. SiO2 2 ball preparation

[0097] 1.1. Mix water, ethanol and ammonia water according to the volume ratio of 5:36:1 to prepare solvent liquid I;

[0098]1.2. Slowly add 1.0ml tetraethyl orthosilicate to the above solvent solution I, stir at room temperature for 5 hours, carry out hydrolysis reaction, then wash with ethanol several times, and dry at 50°C to obtain dispersed SiO 2 ball.

[0099] 2. TiO2 2 Precursor coating

[0100] 2.1. Mix water and ethanol according to the volume ratio of 1:180 to prepare solvent liquid II;

[0101] 2.2. Add 60 mg of highly substituted hydroxypropyl cellulose dropwise into the above solvent solution II. After fully dissolving, add 0.20g of SiO prepared in step 1 2 The balls were fully dissolved to obtain a uniform mixed solution, which was recorded as solution A;

[0102] 2.3. Mix...

Embodiment 3

[0112] Embodiment 3 proposes a kind of preparation method of titanium dioxide nanometer hollow sphere, specifically comprises the following steps:

[0113] 1. SiO2 2 ball preparation

[0114] 1.1. Mix water, ethanol and ammonia water according to the volume ratio of 5:33:1 to prepare solvent liquid I;

[0115] 1.2. Slowly add 1.5ml tetraethyl orthosilicate to the above solvent solution I, stir at room temperature for 12 hours, carry out hydrolysis reaction, then wash with ethanol several times, and dry at 60°C to obtain dispersed SiO 2 ball.

[0116] 2. TiO2 2 Precursor coating

[0117] 2.1. Mix water and ethanol according to the volume ratio of 1:230 to prepare solvent liquid II;

[0118] 2.2. Add 140 mg of highly substituted hydroxypropyl cellulose dropwise into the above solvent solution II. After fully dissolving, add 0.3g of SiO prepared in step 1 2 The balls were fully dissolved to obtain a uniform mixed solution, which was recorded as solution A;

[0119] 2.3. M...

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Abstract

The invention discloses a preparation method of titanium dioxide hollow nanospheres. The preparation method comprises the following steps: firstly, taking tetraethyl orthosilicate as a silicon sourceand preparing silicon dioxide microspheres by adopting a Stobe method; then cladding the surfaces of the silicon dioxide microspheres with a titanium dioxide precursor; then removing a silicon dioxideinner core by adopting strong alkali corrosion; finally, carrying out calcination and hydrothermal treatment to prepare anatase form titanium dioxide hollow nanospheres. The invention further discloses the titanium dioxide hollow nanospheres prepared by the preparation method provided by the invention. The method disclosed by the invention is simple to operate, low in production cost, small in process pollution, high in product yield, good in repeatability and suitable for large-scale production. A titanium dioxide nano-product prepared by the method has the advantages of high purity, good crystallization, controllable crystal form, fine particle granularity, uniform particles, good monodispersity, small particle size, large specific surface area and high photocatalytic activity.

Description

technical field [0001] The invention belongs to the field of nanometer materials, and relates to a preparation method of titanium dioxide nanometer hollow spheres and titanium dioxide nanometer hollow spheres prepared by the method. Background technique [0002] Due to its unique advantages in structure and photoelectrochemical properties, nanomaterials have become a research hotspot in the field of material science today. Nano-titanium dioxide has unique optical properties, high chemical stability, non-toxicity, low cost, high catalytic activity, and can completely contact with food and human body, so nano-titanium dioxide has potential development prospects in many fields. Especially in the field of photocatalysis, titanium dioxide semiconductor photocatalysts can be used to convert solar energy into electrical and chemical energy. Titanium dioxide semiconductor photocatalyst will generate photogenerated electrons and holes when it is illuminated. Photogenerated holes hav...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G23/08C01B33/18B82Y40/00B01J21/06
CPCC01G23/08B01J21/063B01J35/004B82Y40/00C01B33/18C01P2002/72C01P2002/80C01P2004/04C01P2004/34C01P2004/64C01P2006/12C01P2006/80
Inventor 付海涛弓梦丽杨晓红安希忠张浩李武发王文文吴镇湘
Owner NORTHEASTERN UNIV
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