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Method for preparing nano-crystalline photocatalysis titanium dioxide fiber

A technology of crystalline photocatalytic titanium dioxide and titanium hydroxide, which is applied in fiber treatment, textiles and papermaking, artificial filaments made of inorganic raw materials, etc., and can solve the problem of complex spinning solution preparation process, high cost of raw materials, and difficulty in meeting the requirements of dynamic continuous water treatment and other problems, to achieve the effect of spinnability, less burning out and good spinnability

Inactive Publication Date: 2010-09-15
NANJING UNIV OF SCI & TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

These three patented technologies all have the problems of complicated spinning solution preparation process and high raw material cost
[0007] There are also domestic researchers who use potassium titanate or sodium titanate whiskers as raw materials to prepare titanium dioxide fibers with layered structure and high activity through pickling or hydrothermal reaction, but the fiber length is only on the order of microns, which is difficult to meet Dynamic Continuous Water Treatment Requirements

Method used

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  • Method for preparing nano-crystalline photocatalysis titanium dioxide fiber
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  • Method for preparing nano-crystalline photocatalysis titanium dioxide fiber

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preparation example Construction

[0015] The preparation method of the nanocrystalline photocatalyzed titanium dioxide fiber of the present invention adopts titanium hydroxide, aqueous hydrogen peroxide solution, organic acid, and silica sol as raw materials to synthesize polytitanium sol spinning solution, obtains polytitanium gel fiber through centrifugal spinning, and then passes water Nanocrystalline photocatalytic titania fibers obtained by steam activation heat treatment.

[0016] Among them, the process of synthesizing polytitanium sol spinning solution is: according to titanium hydroxide: titanium hydroxide, hydrogen peroxide, organic acid are mixed together according to the molar ratio of 1: 2 ~ 4: 0.7 ~ 1.5, stirring and 5 ℃~25℃, react for 24h~72h, and obtain an orange-yellow transparent solution. According to the final composition of nanocrystalline photocatalyzed titanium dioxide fiber, TiO 2 : SiO 2 = 1mol: 0.1-0.2mol ratio, the conversion amount takes the corresponding volume of silica sol and a...

Embodiment 1

[0024] (1) Synthetic polytitanium sol spinning solution

[0025] According to the ratio of titanium hydroxide: hydrogen peroxide: lactic acid = 1mol: 2mol: 0.7mol, weigh 98g of titanium hydroxide, add concentration of 30% hydrogen peroxide aqueous solution 205mL, lactic acid 52ml, stir and react for 24h at 10°C , to obtain an orange-yellow transparent solution, according to the TiO in the final composition of the fiber 2 : SiO 2 =1mol:0.1mol ratio, measure SiO 2 Add 60ml of silica sol with a content of 10% to the solution obtained above, and age the resulting mixed solution at room temperature for 72 hours, then distill under reduced pressure at 70°C until a polytitanium sol with a viscosity of 30Pa·s is obtained for spinning liquid.

[0026] (2) centrifugal spinning

[0027] The polytitanium sol spinning solution is injected into the centrifugal spinning disc, and the spinning solution is thrown out from a small hole with a diameter of 0.5mm under the action of centrifuga...

Embodiment 2

[0031] As described in Example 1, the difference is that titanium hydroxide in step (1): the ratio of hydrogen peroxide=1mol: 2mol is changed to 1mol: 4mol, and the concentration of aqueous hydrogen peroxide is changed to 60% by 30%, React for 72h under the condition of stirring and 10°C, according to the TiO in the final composition of the fiber 2 : SiO 2 =1mol:0.2mol ratio, measure SiO 2 40ml of silica sol with a content of 30%, and the resulting mixed solution was statically aged at room temperature for 120h.

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Abstract

The invention discloses a method for preparing a nano-crystalline photocatalysis titanium dioxide fiber, which comprises the following steps of: synthesizing a poly-titanium sol spinning fluid by using titanium hydroxide, aqueous solution of hydrogen peroxide, organic acid and a sol as raw materials; performing centrifugal thread throwing to obtain a poly-titanium gelatinous fiber; and performing steam activation heat treatment on the poly-titanium gelatinous fiber to obtain the nano-crystalline photocatalysis titanium dioxide fiber. Compared with the prior art, the preparation of the spinning fluid is innovative and has obvious advantages, the titanium hydroxide, the hydrogen peroxide, the organic acid and the sol are used as the raw materials, and the poly-titanium sol spinning fluid can be prepared through direct reaction and concentration, so a synthetic process is greatly simplified without rigorous reaction conditions and complicated reaction equipment, and no pollution problems exist.

Description

technical field [0001] The invention belongs to the field of functional fiber materials, in particular to a method for preparing nanocrystalline photocatalytic titanium dioxide fibers. Background technique [0002] Titanium dioxide (TiO 2 ) Photocatalytic oxidation technology can generate strong oxidizing free radicals under ultraviolet light irradiation, and quickly and non-selectively oxidize and decompose various toxic organic pollutants in water until they are completely mineralized into CO 2 and H 2 O, and can quickly kill bacteria and viruses in water without causing secondary pollution, ensuring water quality safety and low cost, and is regarded as a very potential water treatment technology, especially in difficult organisms It has broad application prospects in degrading toxic organic wastewater treatment and advanced purification treatment of drinking water. [0003] At present, the traditional application forms of titanium dioxide photocatalysts in water treatm...

Claims

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Application Information

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IPC IPC(8): D01F9/08D01D5/18D01D10/02
Inventor 刘和义裴石光刘金强葛立豪
Owner NANJING UNIV OF SCI & TECH
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