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Method for preparing anatase porous TiO2 spheres, core-shell structure and hollow spheres

A core-shell structure, anatase technology, applied in the field of photocatalytic materials, can solve problems such as limitations and hinder the development of template-free preparation methods and industrial applications, and achieve the effects of low cost, improved operability, and narrow size distribution

Inactive Publication Date: 2012-10-17
INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This limits and hinders the development and industrial application of this template-free preparation method

Method used

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  • Method for preparing anatase porous TiO2 spheres, core-shell structure and hollow spheres
  • Method for preparing anatase porous TiO2 spheres, core-shell structure and hollow spheres
  • Method for preparing anatase porous TiO2 spheres, core-shell structure and hollow spheres

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] At room temperature, under the action of magnetic stirring, 2.0g (8mmol) Ti(SO 4 ) 2 Dissolve in deionized water to form a 60mL solution, add a certain amount of commercial analytical pure HNO to it 3 And dilute to 80mL with deionized water, so that the HNO 3 with Ti(SO 4 ) 2 The molar concentration ratio is 2:1. The above mixed solution was introduced into a polytetrafluoroethylene-lined reaction kettle with a capacity of 100 mL, and kept at 140° C. for 48 hours to obtain a deposit. Then, the resulting sediment was washed with deionized water to neutral pH and dried at 90 °C to obtain TiO 2 Powder, the sample is marked as A.

[0047] The surface morphology and structural characteristics of the sample were observed by using the S-4800 scanning electron microscope of Hitachi, Japan and the 2100 transmission electron microscope of JEOL. The results are as follows: figure 1 (a) and figure 1 As shown in (b), the results show that the obtained TiO 2 It is a solid ba...

Embodiment 2

[0051] At room temperature, under the action of magnetic stirring, 1.0g (4mmol) Ti(SO 4 ) 2 Dissolve in deionized water to form a 60mL solution, add a certain amount of commercial analytical pure HNO to it 3 And dilute to 80mL with deionized water, so that the HNO 3 with Ti(SO 4 ) 2 The molar concentration ratio was 30:1. The above mixed solution was introduced into a polytetrafluoroethylene-lined reaction kettle with a capacity of 100 mL, and kept at 180° C. for 2 hours to obtain a deposit. Then, the resulting sediment was washed with deionized water to neutral pH, and dried at 90 °C to obtain TiO 2 Powder, the sample is marked as B.

[0052] The surface morphology and structural characteristics of the sample: such as figure 2 (a) and (b) are the SEM and TEM images of sample B, respectively, and the obtained TiO 2 It is a core-shell structure, the shell is relatively thin, and the core is relatively large. The XRD analysis results show that all the diffraction peaks...

Embodiment 3

[0054] The difference from the preparation method of Example 2 is that the holding time is 5 hours, and the obtained sample is marked as C.

[0055] The surface morphology and structural characteristics of the sample: such as figure 2 (c) and (d) are the SEM and TEM images of sample C, respectively, and the obtained TiO 2 It is also a core-shell structure, and the difference from sample B obtained in Example 2 is that the shell is relatively thick and the core is relatively small. The size range of the core-shell structure of samples B and C is between 0.5-2 μm. The XRD analysis results show that all the diffraction peaks of the obtained samples belong to the anatase phase, and the grain size of the samples calculated by the Scherrer formula is shown in Table 1. The specific surface area and pore volume data of the samples are shown in Table 1.

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Abstract

The invention belongs to the photocatalytic material field, concretely relates to a method for preparing anatase porous TiO2 spheres, a core-shell structure and hollow spheres. The method comprises the following steps: dissolving titanium salt in water, then adding a HNO3 solution and carrying out a constant temperature reaction in a reaction vessel to obtain sediments; washing by deionized water until pH value presents neutrality, and drying to obtain the TiO2 powder. The invention is characterized in that TiO2 is replaced HF for taking as a corrosive agent, the method is a fluorine-free preparation process, the TiO2 with solid spheres, the core-shell structure and hollow spheres can be prepared by controlling reaction conditions, thereby the dangerousness of the preparation process can be substantially reduced, the maneuverability is enhanced, so that the method is suitable for requirements of large-scale production and industrial application, and possesses good application prospect.

Description

technical field [0001] The invention belongs to the field of photocatalytic materials, in particular to a method for preparing anatase porous titanium oxide balls, core-shell structures and hollow balls. Background technique [0002] TiO 2 It is a photocatalytic material that has been widely studied and applied. It is non-toxic, harmless, and has very stable chemical properties. It has very good application prospects in the fields of photocatalytic degradation of organic matter, photocatalytic sterilization, water splitting to hydrogen production, and dye-sensitized solar cells. TiO 2 The morphology and structure are important factors affecting its photocatalytic performance. Among many different shapes and structures, hollow spheres and core-shell structures are due to their unique properties (such as: low density, high surface / volume ratio, good Permeability, high light-harvesting ability) has attracted much attention. [0003] Common methods for preparing hollow struc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G23/053B01J21/06
Inventor 刘扬李琦高世安尚建库
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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