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Water-soluble nano-titania with adjustable particle size

A nano-titanium dioxide, water-soluble technology, applied in the direction of titanium dioxide, titanium oxide/hydroxide, nanotechnology for materials and surface science, etc., can solve the problem of easy coagulation and sedimentation of nano-titanium dioxide, achieve particle size controllable, The effect of mild reaction conditions and easy control of the reaction process

Inactive Publication Date: 2017-08-15
SICHUAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In order to solve the problem that nano-titanium dioxide is prone to coagulation in water environment in the prior art, the present invention uses a solvothermal method to graft polymers on the surface of nano-titanium dioxide particles, and adjusts the particle size of titanium dioxide by adding titanium tetrachloride. Nano titanium dioxide can be uniformly and stably dispersed in water, has good photocatalytic performance and adjustable particle size

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] Add 3 g of tetrabutyl titanate to 6 g of polyethylene glycol with a molecular weight of 400 heated at 40 °C, and stir at high speed for 10 minutes to obtain a viscous mixture; add 1.179 g of concentrated hydrochloric acid to the above viscous mixture, and continue stirring 20 min; add 1.73g of titanium tetrachloride and stir for 20 min, then transfer to a high-pressure reactor, seal it and place it in an oven at 180°C for 5 h of reaction. Wash with absolute ethanol, centrifuge at 10,000 r / min, repeat the washing operation once, and dry in vacuum to obtain water-soluble nano-titanium dioxide grafted with polyethylene glycol 400 on the surface.

Embodiment 2

[0017] Add 3 g of tetraethyl titanate to 5 g of polytetrahydrofuran with a molecular weight of 2000 heated and melted at 80 °C, and stir at high speed for 30 min to obtain a viscous mixture; add 0.943 g of concentrated hydrochloric acid to the above viscous mixture, and continue stirring 60 min; add 5.19 g of titanium tetrachloride and stir for 40 min, then transfer to a high-pressure reactor, seal it and place it in an oven at 150 °C for 5 h. Wash with absolute ethanol, centrifuge at 6000 r / min, repeat the washing operation twice, and dry in vacuum to obtain water-soluble nano-titanium dioxide with polytetrahydrofuran 2000 grafted on the surface.

Embodiment 3

[0019] Add 3.5 g of tetraisopropyl titanate to 6 g of polypropylene glycol with a molecular weight of 2000 heated at 60 °C, stir at high speed for 20 min to obtain a viscous mixture; add 1.41 g of concentrated hydrochloric acid to the above viscous mixture, and continue stirring 30 min; add 3.46 g of titanium tetrachloride and stir for 30 min, then transfer to a high-pressure reactor, seal it and place it in an oven at 180 °C for 5 h. Wash with water and ethanol, centrifuge at 8000 r / min, repeat the washing operation once, and dry in vacuum to obtain water-soluble nano-titanium dioxide grafted with polypropylene glycol 2000 on the surface.

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Abstract

The invention provides water-soluble nano-titania with an adjustable particle size. A crystal structure of water-soluble nano-titania is an anatase type, the particle size range is 1nm-100m. Water-soluble nano-titania is prepared by the steps of adding a titanium precursor into a heated and fused polymer, stirring to obtain a sticky mixture, adding concentrated hydrochloric acid, continuing to stir for 20-60 minutes, adding titanium tetrachloride, continuing to stir for 20-40 minutes, finally, transferring the product into a high-pressure reaction kettle, and reacting at 140-180 DEG C for 4-8 hours, washing the product with absolute ethanol, carrying out centrifuging, and drying, so as to obtain water-soluble nano-titania with a surface grafted with the polymer. By adjusting the addition amount of water-soluble nano-titania, the particle size of water-soluble nano-titania can be adjusted and controlled, a preparation method of water-soluble nano-titania is simple and feasible, the preparation process is easy to control, and the problem that nano-titania is very easy to be polymerized and coagulated in a water environment in the prior art can be effectively solved; water-soluble nano-titania has potential market application prospects in the field of printing and dyeing wastewater treatment.

Description

technical field [0001] The invention relates to the research field of modification of titanium dioxide, in particular to a water-soluble nano-sized titanium dioxide with uniform crystal form, good photocatalytic performance and uniform and stable existence in water environment with adjustable particle size. Background technique [0002] Titanium dioxide is a non-toxic, cheap and stable semiconductor photocatalytic material, which has broad application prospects in solar cells, hydrogen production by photolysis of water, and environmental pollutant treatment. Titanium dioxide has three crystal forms in nature: rutile type, anatase type and brookite type. It is generally believed that the photocatalytic performance of anatase type titanium dioxide is the best. However, nano-titanium dioxide with controllable particle size, uniform and stable existence in water, and good photocatalytic performance has been rarely reported. The reason is mainly that nano-titanium dioxide, which...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G83/00C01G23/053B82Y30/00B82Y40/00
Inventor 穆畅道雷金凤张美洲吕永博王绅
Owner SICHUAN UNIV
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