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Preparation method for hollow hemispherical titanium dioxide

A technology of titanium dioxide and hollow hemispheres, which is applied in the direction of titanium dioxide, chemical instruments and methods, titanium oxide/hydroxide, etc., can solve the problems of limited application, difficult to further increase specific surface area, and difficult to completely remove, and achieve low equipment requirements , Suitable for large-scale production, outstanding photocatalytic performance

Active Publication Date: 2016-11-09
SHAANXI UNIV OF SCI & TECH
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  • Abstract
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  • Application Information

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Problems solved by technology

Chinese Invention Bulletin Patent CN103816887A discloses a mesoporous hollow nano-titanium dioxide sphere doped with gadolinium ions. Its unique structure improves the utilization rate of photons and holes, and has excellent photocatalytic performance. Silicon is difficult to completely remove in actual production, which limits its application. In addition, this invention prepares a spherical titanium dioxide, and the specific surface area is difficult to further increase
Chinese patent CN1442367A discloses a method for producing rutile nano-titanium dioxide and the resulting nano-titanium dioxide, which has a high application prospect and has good control over the particle size of the product, but it obtains rutile-type titanium dioxide, and Not suitable for application in the field of photocatalysis

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  • Preparation method for hollow hemispherical titanium dioxide
  • Preparation method for hollow hemispherical titanium dioxide
  • Preparation method for hollow hemispherical titanium dioxide

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Embodiment 1

[0023] This embodiment includes the following steps:

[0024] Step 1: Take 6 mL of styrene as the monomer and 0.5 mL of methacrylic acid as the comonomer, raise the temperature to 75 ° C in the aqueous solution, add 0.1273 g of potassium persulfate initiator, and react for 8 hours to obtain a milky white solution. After washing and centrifuging, the obtained Polystyrene nano microsphere powder.

[0025] Step 2: Add 0.3g polystyrene nanosphere powder and 0.5mL ammonia water into 100mL ethanol / acetonitrile mixed solution, the volume ratio of ethanol / acetonitrile is 3:1, stir for 10min, and mark it as reaction solution 1; add 0.5mL Add 20 mL of ethanol / acetonitrile mixed solution of butyl titanate, the volume ratio of ethanol / acetonitrile is 3:1, stir until it dissolves and mark it as reaction solution 2; then add reaction solution 2 dropwise to reaction solution 1, 30 drops / min, after the completion of the reaction, stir for 5 hours, centrifuge, wash and dry to obtain titanium...

Embodiment 2

[0029] This embodiment includes the following steps:

[0030] Step 1: Take 6 mL of styrene as the monomer and 0.5 mL of methacrylic acid as the comonomer, raise the temperature to 75°C in an aqueous solution, and react with 0.1273 g of potassium persulfate initiator for 8 hours to obtain a milky white solution. After washing and centrifuging, polystyrene nanosphere powder is obtained;

[0031] Step 2: Add 0.3g polystyrene and 0.5mL ammonia water to 100mL (3:1 volume ratio) ethanol / acetonitrile mixed solution, stir for 10min, and mark it as reaction solution 1; add 1mL butyl titanate to 20mL (3:1 1 volume ratio) the mixed solution of ethanol / acetonitrile, stir until it dissolves, and mark it as reaction solution 2; then add the reaction solution 2 dropwise to the reaction solution 1, 30 drops / min, stir the reaction for 5 hours after completion, centrifuge, wash and dry Finally, titanium dioxide-coated polystyrene core-shell microspheres were obtained.

[0032] Step 3: Put the...

Embodiment 3

[0035] This embodiment includes the following steps:

[0036] Step 1: Take 7mL styrene as monomer, 0.4mL methacrylic acid as comonomer, heat up to 75°C in aqueous solution, react with 0.1273g potassium persulfate initiator, and react for 8 hours to obtain a milky white solution; after washing and centrifuging, poly Styrene nano microsphere powder.

[0037] Step 2: Add 0.3g polystyrene and 0.5mL ammonia water to 100mL (3:1 volume ratio) ethanol / acetonitrile mixed solution, stir for 10min, and mark it as reaction solution 1; add 1.5mL butyl titanate to 20mL (3:1 : 1 volume ratio) the mixed solution of ethanol / acetonitrile, stir until it dissolves and mark it as reaction solution 2; then add reaction solution 2 dropwise in reaction solution 1, 30 drops / min, stir and react for 5h after completion, centrifuge cleaning and drying After drying, titanium dioxide-coated polystyrene core-shell microspheres were obtained.

[0038] Step 3: Put the titanium dioxide-coated polystyrene cor...

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Abstract

The invention provides a preparation method for hollow hemispherical titanium dioxide. The preparation method comprises the following steps: with a nanometer polystyrene sphere synthesized by using a soap-free emulsion polymerization method as a template, coating the surface of the polystyrene microsphere with a titanium dioxide shell layer by using a mixed solvent method; carrying out centrifugal cleaning and drying so as to obtain a titanium dioxide-coated polystyrene core-shell microsphere; subjecting the titanium dioxide-coated polystyrene core-shell microsphere to high-temperature calcination so as to allow polystyrene to be fused and decomposed, wherein the shell part of titanium dioxide collapses to form a semispherical structure and the hollow hemispherical titanium dioxide with excellent photocatalysis performance is obtained. The method provided by the invention can realize controllable adjustment of the size and thickness of titanium dioxide hemispheres, and is simple to operate and easy to realize large-scale production; and the prepared hollow hemispherical titanium dioxide has the characteristics of a large specific surface area, low density and excellent photocatalysis performance.

Description

technical field [0001] The invention relates to the technical field of preparation of nano photocatalytic materials, in particular to a preparation method of hollow hemispherical titanium dioxide. Background technique [0002] In 1972, Fujishima and Honda first introduced TiO 2 Electrodes are used to split water. Since then, TiO 2 The potential in photocatalysis, solar energy conversion, gas sensor, etc. has made it widely studied. TiO 2 The photocatalytic activity of ions mainly depends on its morphology and macrostructure. Currently, researchers synthesize a variety of TiO 2 Nanostructures, such as nanorods, nanowires, nanotubes, and hollow sphere structures. Among them, the hollow sphere structure has attracted extensive attention due to its low density, large surface area, and good photocatalytic performance. Synthetic TiO 2 The most commonly used method for hollow spheres is the template method, using organic particles as a template, attaching titanium dioxide t...

Claims

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Application Information

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IPC IPC(8): C01G23/053B01J21/06
CPCC01G23/053B01J21/063C01P2004/62C01P2004/04C01P2004/03C01P2004/34C01P2002/82B01J35/39
Inventor 王芬苟紫娟王磊林莹王毅
Owner SHAANXI UNIV OF SCI & TECH
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