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Preparation of core/shell structural polystyrene/titanium dioxide composite photo catalyst

A technology of titanium dioxide and polystyrene, which is applied in the field of preparation of composite photocatalysts to achieve high catalytic activity and good suspension

Inactive Publication Date: 2009-09-23
DONGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Water vapor is used to promote the hydrolysis of butyl titanate dissolved in ethanol, and a core / shell structure zinc oxide / titanium dioxide photocatalyst (Zhang Qinghong, Gao Lian, Fan Wugang, China Invention Application No. 200710039531.1) can be prepared, in which titanium dioxide does not need to be calcined. Anatase phase, but not involved in the use of polymers as supports for core / shell structures

Method used

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  • Preparation of core/shell structural polystyrene/titanium dioxide composite photo catalyst
  • Preparation of core/shell structural polystyrene/titanium dioxide composite photo catalyst
  • Preparation of core/shell structural polystyrene/titanium dioxide composite photo catalyst

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Add 0.16 mL of butyl titanate to 8 mL of absolute ethanol, stir for 2 minutes, add 0.1 g of polystyrene microspheres prepared by soap-free emulsion polymerization to the lower alcohol after anhydrous, ultrasonicate and stir for 3 minutes each. Pour the polystyrene-containing anhydrous alcohol solution into the crucible and place it on top of a sealable container. The bottom of the sealable container is prefilled with 3 mL of distilled water. After sealing the container, put it into an oven, start heating to 150°C, the heating rate is 10-20°C / min, and keep it warm for 10 hours after the temperature reaches the set temperature. Cool down to room temperature naturally after the heat preservation, open the airtight container, take out the crucible, pour out the powder, wash with distilled water and absolute alcohol three times respectively, and dry in vacuum at 60°C for 8 hours. The powder was calcined at 500°C for 2h to obtain hollow titanium dioxide microspheres. figure...

Embodiment 2

[0030]Add 0.16 mL of butyl titanate to 8 mL of absolute ethanol, stir for 2 minutes, add 0.1 g of polystyrene microspheres prepared by soap-free emulsion polymerization to the lower alcohol after anhydrous, ultrasonicate and stir for 3 minutes each. Pour the polystyrene-containing anhydrous alcohol solution into the crucible and place it on top of a sealable container. The bottom of the sealable container is prefilled with 5 mL of distilled water. After sealing the container, put it into an oven, start heating to 140°C, the heating rate is 10-20°C / min, and keep it warm for 12 hours after the temperature reaches the set temperature. Cool down to room temperature naturally after the heat preservation, open the airtight container, take out the crucible, pour out the powder, wash with distilled water and absolute alcohol three times respectively, and dry in vacuum at 60°C for 8 hours. figure 2 The field emission scanning electron micrograph of polystyrene / titanium dioxide is giv...

Embodiment 3

[0032] Add 0.1 mL of butyl titanate to 8 mL of absolute ethanol, stir for 2 minutes, add 0.1 g of polystyrene microspheres prepared by soap-free emulsion polymerization to the lower alcohol after anhydrous, ultrasonicate and stir for 3 minutes each. Pour the polystyrene-containing anhydrous alcohol solution into the crucible and place it on top of a sealable container. The bottom of the sealable container is prefilled with 10 mL of distilled water. After sealing the container, put it into an oven, raise the temperature to 180°C, the heating rate is 10-20°C / min, and keep it warm for 8 hours after the temperature reaches the set temperature. Cool down to room temperature naturally after heat preservation, open the airtight container, take out the crucible, pour out the powder, wash with distilled water and absolute alcohol three times respectively, and dry at 90°C for 24 hours. image 3 The transmission electron micrographs of polystyrene / titanium dioxide composite photocatalys...

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Abstract

The invention relates to preparation of core / shell structural polystyrene / titanium dioxide composite photo catalyst, comprising the steps of: (1) dissolving titanium alkoxide in absolute lower alcohol to be prepared into aqueous alcohol solution of titanium alkoxide with the concentration of titanium alkoxide in the lower alcohol being 0.004-0.100mL / Ml; (2) adding polystyrene microballs into the aqueous alcohol solution of titanium alkoxide to experience ultra-sound and stirring to obtain a uniform mixture; (3) placing a crucible holding, the polystyrene microballs and the aqueous alcohol solution of titanium alkoxide in a closed container, heating the closed container to 70-200 DEG C for heat treatment and preserving temperature for 1-96 hours; washing and drying to obtain the core / shell structural polystyrene / titanium dioxide composite photo catalyst. The photo catalyst prepared by the invention maintains the characteristic of high catalytic activity of titanium dioxide nano crystal grain, and has the photo catalytic activity similar to the photo catalytic activity of nano titanium dioxide prepared by gas phase method in the majority of photo catalysis reactions.

Description

technical field [0001] The invention belongs to the field of preparation of composite photocatalysts, in particular to the preparation of polystyrene / titanium dioxide composite photocatalysts with a core / shell structure. Background technique [0002] Nano-titanium dioxide is a common photocatalyst, which has attracted widespread attention because of its good chemical stability, high oxidation activity, non-toxicity to the human body, low cost and wide application range. However, because nanocrystals are easy to agglomerate, nano-titanium dioxide is often agglomerated into larger particles. Due to the absorption and scattering of light by surface titanium dioxide, the light inside the particles is not sufficient. Therefore, the light-harvesting efficiency of larger particles of titanium dioxide is low. Large particles are easy to settle under the action of gravity and have poor suspension in the liquid phase, which also limits the practical application of titanium dioxide pho...

Claims

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Application Information

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IPC IPC(8): B01J21/06B01J31/06B01J35/02B01J37/04B01J37/08
Inventor 张青红石福志朱美芳王宏志李耀刚
Owner DONGHUA UNIV
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