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Preparation method for nano-titanium dioxide

A technology of nano-titanium dioxide and alumina, applied in chemical instruments and methods, nanotechnology, nanotechnology, etc., can solve problems such as difficult washing of chloride ions, difficulty in preparing titanium dioxide nanocrystals, etc.

Inactive Publication Date: 2014-09-24
CHANGSHA UNIVERSITY OF SCIENCE AND TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The invention provides a method for preparing a novel nano-titanium dioxide powder to solve the problem that it is difficult to prepare titanium dioxide nanocrystals at room temperature in the prior art, and it is difficult to wash chloride ions in the system during the process of preparing titanium dioxide nanocrystals using chloride as a raw material. the puzzle

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  • Preparation method for nano-titanium dioxide
  • Preparation method for nano-titanium dioxide
  • Preparation method for nano-titanium dioxide

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preparation example Construction

[0019] The preparation method of nano-titanium dioxide nano-powder of the present invention comprises the following processing steps:

[0020] (1) Prepare titanium tetrachloride into solutions with concentrations of 0.5mol / L, 1.0mol / L, 1.5mol / L, and 2.0mol / L;

[0021] (2) The titanium ruthenium electrode is used as the anode, and the titanium electrode is used as the cathode, such as figure 1 the coupling device shown;

[0022] (3) With a constant voltage of 1-5V, the initial current density is 100-200A / m 2 , energized electrolysis;

[0023] (4) Measure the pH value of the solution once every hour, until the pH value of the solution exceeds 1.8 and the current density is less than 10 A / m 2 stop electrolysis;

[0024] (5) Aging for 8 hours, 12 hours, 24 hours and 48 hours respectively;

[0025] (6) Add a gelling agent dropwise to convert the sol into a gel;

[0026] (7) Wash the gel with distilled water and ethanol respectively;

[0027] (8) Dry the gel in a vacuum oven ...

Embodiment

[0029] Step 1, the concentration of titanium tetrachloride is respectively 0.5mol / L, 1.0mol / L, 1.5mol / L, 2.0mol / L solution, and its pH value is measured for later use;

[0030] Step 2, clean the electrode surface with hydrochloric acid, take the titanium ruthenium electrode as the anode, and the titanium electrode as the cathode, such as figure 1 the coupling device shown;

[0031] Step 3: Use a constant voltage of 1-5V and an initial current density of 100-200A / m 2 , energized electrolysis;

[0032] Step 4. Measure the pH value of the solution once in 1 hour. When the pH value of the solution exceeds 1.8, the current density is less than 10 A / m 2 stop electrolysis;

[0033] Step 5, aging the sol obtained after electrolysis for 8 hours, 12 hours, 24 hours, and 48 hours respectively;

[0034] Step 6, adding a gelling agent dropwise to convert the sol into a gel;

[0035] Step 7. Wash the gel with distilled water and ethanol until AgNO 3 Chloride ions cannot be detected; ...

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Abstract

The invention relates to a preparation method for nano-titanium dioxide. Titanium tetrachloride is adopted as raw material for obtaining nano-aluminum oxide through an electrolyzing method. Chloride ions are very prone to generating adsorption on nano oxide particles and very difficult to wash and generate great influences on the application of the nano oxide. In the system, the removal rate of the chloride ions is over 99% after electrolyzing, and the problem that chloride ions are difficult to wash with chloride being raw material in the process of preparing the nano oxide is solved. Meanwhile, the nano-titanium dioxide is high in crystallization degree at normal temperature and are in the crystal habit of rod-shaped or filament-shaped rutile type titanium dioxide particles, for the particle size, the average particle size of primary particles is 7 nanometers, and the average particle size of secondary particles is 20 nanometers after sintering is performed at 500 DEG C.

Description

technical field [0001] The invention relates to a preparation method of inorganic chemical materials, in particular to a preparation method of nano titanium dioxide powder. Background technique [0002] Titanium dioxide ultrafine particles with a nanoscale size are favored because of their excellent photocatalytic properties. Many methods for preparing nano-titanium dioxide have been developed over the years, but whether alkoxides or inorganic substances are used as precursors, the synthetic The powder is generally in an amorphous state. The preparation of titanium dioxide nanocrystals at low temperature or near room temperature is still a major problem in the preparation of titanium dioxide nanopowders. [0003] A variety of methods have been developed to prepare nano-titanium dioxide from titanium tetrachloride, but the application of nano-titanium dioxide powder is greatly limited due to the presence of chloride ions. Chloride ions are easily adsorbed on the surface of n...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C30B29/16C30B7/12B82Y40/00B82Y30/00
Inventor 乐新波张雄飞
Owner CHANGSHA UNIVERSITY OF SCIENCE AND TECHNOLOGY