Method of preparing nano titanium dioxide crystallization induced by nano microcrystalline cellulose

A technology of nano-titanium dioxide and nano-crystallite, which is applied in the direction of titanium dioxide, chemical instruments and methods, titanium oxide/hydroxide, etc., to achieve the effects of regular shape, cheap raw materials, and shortened reaction time

Inactive Publication Date: 2007-02-07
GUANGZHOU INST OF GEOCHEMISTRY - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Taking advantage of the special properties of nano-microcrystalline cellulose and using nano-microcrystalline cellulose as a crystallization inducer, square and needle-shaped nano-titanium dioxide with controllable morphology can be prepared under low temperature conditions. No reports have been seen so far.

Method used

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  • Method of preparing nano titanium dioxide crystallization induced by nano microcrystalline cellulose
  • Method of preparing nano titanium dioxide crystallization induced by nano microcrystalline cellulose

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Experimental program
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Effect test

Embodiment 1

[0025] Step 1: Preparation of nanocrystalline cellulose

[0026] According to the method in Chinese invention patent No. 00117261, a kind of nano-microcrystalline cellulose and its preparation method, that is, natural cellulose is used, pre-treated with alkali, dimethyl sulfoxide, and quaternary ammonium salt, and then hydrolyzed with strong acid and ultrasonically oscillated. Prepare nano-microcrystalline cellulose;

[0027] Step 2: Preparation of Nano Titanium Dioxide

[0028] First in 100 grams of water, add 0.03 gram of nano-microcrystalline cellulose prepared in step 1, prepare a weight percentage concentration of 0.03% nano-microcrystalline cellulose aqueous dispersion, and then after ultrasonic treatment, add nano-crystalline cellulose to the nano-crystalline cellulose aqueous dispersion 0.5 milliliters (0.86 grams) of titanium tetrachloride was added dropwise, that is, the weight ratio of dry nano-microcrystalline cellulose and titanium tetrachloride was 1: 28.8, then...

Embodiment 2

[0032] Step 1: Preparation of nanocrystalline cellulose

[0033] Prepared according to the method in Chinese Invention Patent No. 00117261, a kind of nano-microcrystalline cellulose and its preparation method;

[0034] Step 2: Preparation of Nano Titanium Dioxide

[0035] First in 100 grams of water, add 0.06 gram of nano-microcrystalline cellulose prepared in step 1, prepare a weight percentage concentration of 0.06% nano-microcrystalline cellulose aqueous dispersion, and then after ultrasonic treatment, add nano-microcrystalline cellulose to the nano-microcrystalline cellulose aqueous dispersion 1.5 milliliters (2.59 grams) of titanium tetrachloride was added dropwise in the solution, that is, the weight ratio of dry nanocrystalline cellulose and titanium tetrachloride was 1: 43.2, and then stirred and reacted at 120° C., and the reaction time was 5.5 hours;

[0036] Step 3: Post-processing

[0037] After filtering, washing, and vacuum drying, a square nanometer titanium d...

Embodiment 3

[0039] Step 1: Preparation of nanocrystalline cellulose

[0040] Prepared according to the method in Chinese Invention Patent No. 00117261, a kind of nano-microcrystalline cellulose and its preparation method;

[0041] Step 2: Preparation of Nano Titanium Dioxide

[0042] First in 100 grams of water, add 0.1 gram of nanocrystalline cellulose prepared in step 1, prepare a weight percentage concentration of 0.1% nanocrystalline cellulose aqueous dispersion, add 0.2 gram of polyethylene glycol (molecular weight is 200), make it The weight percent concentration relative to water reaches 0.2%, and after ultrasonic treatment, 1 milliliter (1.726 grams) of titanium tetrachloride is added dropwise in the nano-microcrystalline cellulose aqueous dispersion, promptly press dry nano-microcrystalline cellulose and tetrachloride The weight ratio of titanium chloride is 1: 17.3, then stirred and reacted at 90° C., and the reaction time is 4 hours;

[0043] Step 3: Post-processing

[0044]...

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Abstract

This invention relates to a preparation method for square and needle-like nano-titanium dioxide with nanometer microcrystalline cellulose as crystallization inducer. The method comprises preparing nanometer microcrystalline cellulose dispersing solution with concentration of 0.01-5 wt.%, adding additive, ultrasonic-treating, adding titanium tetrachloride into the dispersing solution, wherein the weight ratio of nanometer microcrystalline cellulose to titanium tetrachloride is 1:1-1:150, stirring at 20- 120DEG C for 2-15 hours, and regulating these conditions to obtain square, needle-like nano-titanium dioxide. The invention has the advantages of cheap raw materials, simple process, easy operation, good repeatability, mild reaction conditions, low temperature, short response time, and no torrefaction. Through regulating conditions, the morphology of titanium dioxide can be controlled, achieving regular size distribution and morphology. The nano-titanium dioxide can be widely used in photoelectric materials, decorative materials, and the environmental catalytic materials.

Description

technical field [0001] The invention relates to a preparation method of nano-titanium dioxide, in particular to a method for preparing square and needle-shaped nano-titanium dioxide with controllable morphology by inducing crystallization of nano-microcrystalline cellulose. Background technique [0002] Due to its stable chemical properties, acid and alkali corrosion resistance, non-toxicity, excellent photocatalytic activity and super hydrophilicity, titanium dioxide can be widely used in antibacterial deodorization, air purification, sewage treatment, antifouling and antifog, automotive topcoat, cosmetics and other fields. However, the traditional nano-TiO2 preparation methods mainly include gas-phase method, hydrothermal method, solvothermal method, and sol-gel method. The gas phase method requires high reaction temperature; the hydrothermal method requires high pressure, high equipment requirements, and high energy consumption; the solvothermal m...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G23/047B01J21/06
Inventor 丁恩勇周艳
Owner GUANGZHOU INST OF GEOCHEMISTRY - CHINESE ACAD OF SCI
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