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Dual-template preparation method of mesoporous TiO2 sphere

A dual-template, mesoporous technology, applied in chemical instruments and methods, alkali metal oxides/hydroxides, inorganic chemistry, etc., can solve problems such as difficult separation, poor adsorption and photocatalytic performance, and achieve simple preparation and high adsorption performance and good photocatalytic performance

Inactive Publication Date: 2014-02-12
TAIZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to prepare the TiO that the traditional method existing for prior art exists 2 Dense, poor adsorption and photocatalytic properties, and difficult to separate after treatment, providing a mesoporous TiO 2 The double template preparation method of sphere, this method is easy to prepare, the prepared TiO 2 With a mesoporous structure, it has the advantages of good adsorption performance and photocatalytic performance

Method used

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  • Dual-template preparation method of mesoporous TiO2 sphere
  • Dual-template preparation method of mesoporous TiO2 sphere
  • Dual-template preparation method of mesoporous TiO2 sphere

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preparation example Construction

[0024] The mesoporous TiO provided by the embodiment of the present invention 2 The double template preparation method of sphere, this preparation method comprises the following steps:

[0025] Step 1, preparing chitosan acetic acid solution and polyvinyl alcohol aqueous solution respectively;

[0026] Step 2, mixing the above two solutions according to a certain ratio under mechanical stirring at 70±1°C to form a mixed solution;

[0027] Step 3, use a syringe to drop the mixed solution into a sodium hydroxide solution with a molar concentration of 0.5M, and instantly form chitosan / PVA hydrogel microspheres with a particle size of 2-3mm;

[0028] Step 4, standing overnight, after being completely solidified, soaking in double distilled water, ethanol, and isopropanol for 30 minutes, and filtering to obtain swollen porous microspheres;

[0029] Step five, soak the chitosan / PVA hydrogel microspheres in the titanium isopropoxide solution for 48 hours at room temperature, the ti...

Embodiment 1

[0048] Dissolve 2g of chitosan powder in 500ml of 5% acetic acid aqueous solution to obtain chitosan acetic acid solution; dissolve 2g of polyvinyl alcohol powder in 50ml of double distilled water, and dissolve under mechanical stirring at 70±1°C, An aqueous solution of polyvinyl alcohol was obtained. The above-mentioned chitosan acetic acid solution and polyvinyl alcohol aqueous solution are mixed according to the volume ratio of 1:1 under mechanical stirring at 70±1° C. to form a mixed solution. Use a syringe with an internal diameter of 0.8mm to drop the mixed solution into 500ml of sodium hydroxide solution with a molar concentration of 0.5M, and instantly form chitosan / PVA hydrogel microspheres with a particle size of 2-3mm; Place overnight, after being completely solidified, soak in double distilled water, ethanol, and isopropanol for 30 minutes, and filter to obtain swollen porous microspheres; at room temperature, chitosan / PVA hydrogel microspheres After soaking in the ...

Embodiment 2

[0050] The difference from Example 1 is that the calcination temperature is 400°C, and the calcined material is marked as TS-400, TiO 2 The pore diameter of the ball is 10.11nm, and the pore volume is 0.376cm 3 / g, indicating that the prepared TiO of TS-400 2 The ball is a mesoporous material.

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Abstract

The invention discloses a dual-template preparation method of a mesoporous TiO2 sphere. The preparation method comprises the steps of respectively preparing a chitosan acetic acid solution and a polyvinyl alcohol water solution; mixing the two solutions in a certain proportion to form a mixed solution; dropwise adding the mixed solution into a sodium hydroxide solution through an injector to form a chitosan / polyvinyl acetate (PVA) hydrogel microsphere instantaneously; standing overnight, completely curing, respectively soaking the microsphere in double-distilled water, ethanol and isopropyl alcohol for 30min, and filtering to obtain a swelled porous microsphere; soaking the microsphere in a titanium isopropylate solution for 48 hours; soaking the chitosan / PVA microsphere loaded with the titanium isopropylate in excessive water for 24 hours, and washing the obtained microsphere to remove titanium hydroxide deposited on the surface of the porous chitosan / PVA polymer; drying the obtained microsphere to constant weight; and calcining a obtained sample to obtain the mesoporous TiO2 sphere. The method is simple and convenient to prepare, and the prepared TiO2 which is of a mesoporous structure has good adsorbability and photocatalysis.

Description

technical field [0001] The present invention relates to a kind of mesoporous TiO 2 A dual-template preparation method for spheres. Background technique [0002] Industrial wastewater often contains a wide variety of organic pollutants, many of which are difficult to biodegrade and can remain in the environment for a long time. Today, with the rapid development of green environmental protection, the photodegradation catalytic wastewater treatment technology with simple operation, low cost, strong oxidation ability and no secondary pollution has attracted much attention. The development of new water treatment materials and new processes for the comprehensive treatment of water pollutants and the control of toxic organic pollutants have become one of the key issues to be solved in the environmental field. [0003] As early as the 1970s, Japanese scholars Fuiishima and Honda discovered the use of titanium dioxide (TiO 2 ) semiconductor single crystal electrode can be photocat...

Claims

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Application Information

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IPC IPC(8): C01G23/08B01J20/06B01J20/28B01J21/06B01J35/10
Inventor 朱华跃付永前蒋茹姚俊孔庆娜张湛洋
Owner TAIZHOU UNIV
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