Method for preparing titanium dioxide/silicate mineral nano composites

A technology of nanocomposite materials and silicate minerals, applied in chemical instruments and methods, chemical/physical processes, light water/sewage treatment, etc., can solve the problem of easy aggregation of nano-titanium dioxide particles, low recycling value, and influence on photocatalysis Effect and other issues, to achieve the effect of low price, improve photocatalytic efficiency and save cost

Active Publication Date: 2012-07-18
CHANGZHOU UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The disadvantages of this method are: using dilute sulfuric acid to treat the original soil, the waste liquid produced will pollute the environment, and if it is treated separately, the cost will increase; the nano-titanium dioxide particles are easy to agglomerate after calcination, thus affecting the photocatalytic effect and the recyclin

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  • Method for preparing titanium dioxide/silicate mineral nano composites
  • Method for preparing titanium dioxide/silicate mineral nano composites

Examples

Experimental program
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Embodiment 1

[0022] Example 1: Add 10 kilograms of attapulgite powder to 30 liters of 2.0 mol / liter titanium tetrachloride solution and immerse for 24 hours at room temperature to obtain a titanium dioxide precursor / attapulgite slurry. Control the temperature of the titanium dioxide precursor / attapulgite slurry to 30°C. While stirring, add 2.0 mol / L sodium hydroxide solution to the slurry. When the pH of the system reaches 2.5, filter and wash to the conductivity of the filtrate It is 150μS / cm, and the filter cake of titanium dioxide hydrate / attapulgite composite body is obtained. The filter cake was added to 30 liters of 0.5 mol / liter titanium tetrachloride solution, the temperature was raised to 80°C, and the reaction was kept at a temperature of 4 hours with stirring, then the pH of the system was adjusted to 7.0 with 2.0 mol / liter sodium hydroxide solution, and filtered, Washing, drying at 60° C., and pulverizing to obtain titanium dioxide / attapulgite nanocomposite powder. The titanium...

Embodiment 2

[0023] Example 2: Add 10 kilograms of attapulgite powder to 25 liters of 0.5 mol / liter titanium tetrachloride solution and immerse for 60 hours at room temperature to obtain a titanium dioxide precursor / attapulgite slurry. Control the temperature of the titanium dioxide precursor / attapulgite slurry to 10°C. While stirring, add 4.0 mol / L potassium hydroxide solution to the slurry. When the pH value of the system reaches 1.6, filter and wash to the conductivity of the filtrate It is 105μS / cm, and the filter cake of titanium dioxide hydrate / attapulgite composite body is obtained. The filter cake was added to 62.5 liters of 0.2 mol / liter titanium tetrachloride solution, the temperature was raised to 100°C, and the temperature was kept agitated for 1 hour, and the pH value of the system was adjusted to 6.5 with 4.0 mol / liter potassium hydroxide solution, and filtered, Washing, drying at 80°C, and pulverizing to obtain titanium dioxide / attapulgite nanocomposite powder. The titanium ...

Embodiment 3

[0024] Example 3: Add 10 kilograms of attapulgite powder to 33.3 liters of 3.0 mol / liter titanium tetrachloride solution and immerse for 3 hours at room temperature to obtain a titanium dioxide precursor / attapulgite slurry. Control the temperature of the titanium dioxide precursor / attapulgite slurry to 50°C. While stirring, add 0.5 mol / L of ammonia to the slurry. When the pH of the system reaches 3.0, filter and wash until the conductivity of the filtrate is 200μS / cm, get the titanium dioxide hydrate / attapulgite composite filter cake. The filter cake was added to 25 liters of 1.0 mol / liter titanium tetrachloride solution, the temperature was raised to 60°C, the temperature was kept and stirred for 12 hours, and the pH of the system was adjusted to 7.5 with 0.5 mol / liter ammonia water, filtered, washed, and 120 Drying and pulverizing at ℃ to obtain titanium dioxide / attapulgite nanocomposite powder. The titanium dioxide in the nanocomposite is a mixed crystal of anatase and rut...

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Abstract

The invention relates to a method for preparing titanium dioxide/silicate mineral nano composites. The method comprises the following steps of: firstly, adding silicate minerals to a titanium tetrachloride solution to activate the silicate minerals and dissolve foreign ions; secondly, adding a certain alkaline solution to convert titanium ions to titanium dioxide hydrate precipitates and washing off other foreign ions to obtain titanium dioxide hydrate/silicate mineral complex filter cakes; and thirdly, adding the filter cakes to the titanium tetrachloride solution, adopting the acid environment of the titanium tetrachloride solution to realize dissolution of the titanium dioxide hydrates, secondary activation of the silicate minerals and low temperature crystallization and growth of nanotitanium dioxide on the silicate minerals and carrying out filtering, washing, drying and grinding, thus finally preparing the titanium dioxide/silicate mineral nano composites. The method has the following advantages that the method is simple and practical in steps; the reaction conditions are mild; the raw materials are simple and have low cost; and the method is suitable for large-scale production and can be beneficial to effective improvement of the photocatalytic efficiency of titanium dioxide.

Description

Technical field [0001] The invention relates to a method for preparing a titanium dioxide / silicate mineral nano composite material. Background technique [0002] Nano-titanium dioxide is a typical photocatalyst. It has the advantages of high catalytic activity, stable chemical properties, non-toxicity, and safe use. It has broad application prospects in wastewater treatment. However, in the actual use process of nano-titanium dioxide, there are disadvantages such as poor dispersion and difficulty in recovery, which limits its industrial application. In recent years, the use of various supports to prepare supported titanium dioxide photocatalysts has attracted much attention. Among them, silicate minerals as photocatalyst supports have the advantages of abundant reserves, low price, large specific surface area, excellent adsorption performance and easy recovery. widely used. Chinese patent CN1970149A discloses a kind of diatomite particles loaded with nano-TiO 2 The method of pr...

Claims

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Application Information

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IPC IPC(8): B01J21/16C02F1/32
Inventor 姚超张兴兴陈群刘文杰孔泳马江权
Owner CHANGZHOU UNIV
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