Macro pore/meso pore TiO2 film with high double ordered structure and preparation method thereof

A macroporous and mesoporous technology, applied in the direction of titanium oxide/hydroxide, titanium dioxide, etc., can solve the problems of difficult access to reactants, easy recombination of photogenerated electrons and holes, and few photocatalytic reaction points, so as to promote effective The formation of ordered structure, shortening aging time, and improving the effect of order

Active Publication Date: 2012-07-04
INST OF PROCESS ENG CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

But the denser TiO 2 When the mesoporous thin film material participates in the photocatalytic reaction, due to the compactness of the film, the reaction mainly occurs on the surface of the film, while the mesoporous TiO inside the film 2 It is difficult to access the reactants, so that the photocatalytic efficiency cannot be further improved
macroporous TiO ...

Method used

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  • Macro pore/meso pore TiO2 film with high double ordered structure and preparation method thereof
  • Macro pore/meso pore TiO2 film with high double ordered structure and preparation method thereof
  • Macro pore/meso pore TiO2 film with high double ordered structure and preparation method thereof

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Experimental program
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Effect test

Embodiment 1

[0030] 80ml H 2 O, 10ml styrene, 0.146g sodium bicarbonate (dissolved in 10mlH 2 O), 0.6ml methacrylic acid, after mixing evenly, heat it in a water bath to 80°C, then quickly add 0.072g of initiator KPS (dissolved in 10mlH 2 O), after reacting for 4h, the temperature was raised to 90°C for another 1h, and the whole process was carried out under N 2 under protection. The product was centrifuged and washed three times with deionized water, and the obtained product was PS spheres with an average diameter of 300 nm.

[0031] After immersing the glass slide in a mixed solution of concentrated sulfuric acid and hydrogen peroxide (volume ratio 7:3) for 24 hours, they were ultrasonically cleaned with acetone and ethanol for 30 min, respectively. The cleaned glass slide is vertically immersed in a 0.3% aqueous solution of PS spheres by mass, and the suspension is evaporated to dryness at 55° C., and a uniform PS sphere colloidal crystal template can be obtained on the glass slide. ...

Embodiment 2

[0034] 80ml H 2 O, 10ml styrene, 0.146g sodium bicarbonate (dissolved in 10mlH 2 O), 0.6ml methacrylic acid, after mixing evenly, heat it in a water bath to 80°C, then quickly add 0.144g of initiator KPS (dissolved in 10mlH 2 O), after reacting for 4h, the temperature was raised to 90°C for another 1h, and the whole process was carried out under N 2 under protection. The product was centrifuged and washed three times with deionized water, and the obtained product was PS spheres with an average diameter of 240 nm.

[0035] After immersing the glass slide in a mixed solution of concentrated sulfuric acid and hydrogen peroxide (volume ratio 7:3) for 24 hours, they were ultrasonically cleaned with acetone and ethanol for 30 min, respectively. The cleaned glass slide is vertically immersed in a 0.3% aqueous solution of PS spheres by mass, and the suspension is evaporated to dryness at 55° C., and a uniform PS sphere colloidal crystal template can be obtained on the glass slide. ...

Embodiment 3

[0038] 80ml H 2 O, 10ml styrene, 0.146g sodium bicarbonate (dissolved in 10mlH 2 O), 0.6ml methacrylic acid, after mixing evenly, heat it in a water bath to 80°C, then quickly add 0.072g of initiator KPS (dissolved in 10mlH 2 O), after reacting for 4h, the temperature was raised to 90°C for another 1h, and the whole process was carried out under N 2 under protection. The product was centrifuged and washed three times with deionized water, and the obtained product was PS spheres with an average diameter of 300 nm.

[0039] After immersing the glass slide in a mixed solution of concentrated sulfuric acid and hydrogen peroxide (volume ratio 7:3) for 24 hours, they were ultrasonically cleaned with acetone and ethanol for 30 min, respectively. The cleaned glass slide is vertically immersed in a 0.3% aqueous solution of PS spheres by mass, and the suspension is evaporated to dryness at 55° C., and a uniform PS sphere colloidal crystal template can be obtained on the glass slide. ...

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Abstract

The invention provides a macro pore/meso pore TiO2 film with high double ordered structure and a preparation method thereof. The method comprises the following steps: preparing monodispersed polystyrene spheres; then arranging the polystyrene spheres on a glass slide to form a close-packed opal structure through evaporation, induction and self assembly, thus preparing a polystyrene sphere colloidal crystal template; placing the template in a Ti precursor sol and preparing a composite film by a soaking-pulling method; and finally removing organic matters through thermal treatment, thus obtaining the macro pore/meso pore TiO2 film. The macro pore/meso pore TiO2 film provided by the method has high double orderliness; by virtue of the control on the grain diameter and uniformity of the polystyrene spheres, the selection of surfactants and the control over soaking-pulling and thermal treatment conditions, the regulation and control over the size and orderliness of the macro pores and meso pores of the film are realized; and by virtue of the synergetic effect of the macro pores and the meso pores, the photocatalysis efficiency of materials is greatly improved. The method provided by the invention has the advantages of simplicity and convenience in operation, high controllability and wide application prospect.

Description

technical field [0001] The invention belongs to the technical field of functional materials, and in particular relates to a TiO with a multi-level ordered pore structure. 2 Thin films and methods for their preparation. Background technique [0002] TiO 2 It is an N-type semiconductor material that generates electrons and holes under the irradiation of ultraviolet light. It has a strong redox ability and has a wide range of applications in photocatalysis, gas sensors, and solar energy conversion. Due to the increasingly severe environmental pollution problems in recent years, photocatalytic degradation technology has attracted much attention. TiO 2 It has the advantages of high activity, chemical stability, light corrosion resistance, insoluble, non-toxic, cheap and easy to obtain, and can not only completely oxidize organic pollutants into CO 2 、H 2 O or other inorganic substances, and the photocatalytic reaction can be carried out at room temperature, so TiO 2 It is c...

Claims

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Application Information

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IPC IPC(8): C01G23/053C03C17/23
Inventor 王丹杜江赖小勇毛丹
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI
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