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Preparation method of visible light photoactivated octahedrite type titanium oxide colloidal sols

An anatase-type, titanium dioxide technology, applied in the direction of titanium dioxide, titanium oxide/hydroxide, etc., can solve the problems of obvious target biological resistance, harsh preparation conditions, and aggravated agricultural environmental pollution, so as to improve the utilization rate of visible light, Inexpensive, avoid hard agglomeration effect

Inactive Publication Date: 2005-08-17
GUANGDONG INST OF ECO ENVIRONMENT & SOIL SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Specifically, at present, there are mainly the following problems in the use of chemical pesticides: (1) low biological activity to the target, but high toxicity to non-target organisms
(2) The pesticide itself and its degradation intermediates are easy to accumulate in the environment or in animals and plants
(3) The drug resistance of target organisms is obvious, and the application amount needs to be increased year by year, which aggravates the pollution of agricultural environment
(4) Poor broad-spectrum, a pesticide is often only effective for one or several diseases
However, its preparation conditions are relatively harsh. For example, relatively strict conditions such as microwave, ultrasonic or high-pressure closed system are required in the degumming process. If this is used for large-scale production, the cost is too high

Method used

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  • Preparation method of visible light photoactivated octahedrite type titanium oxide colloidal sols
  • Preparation method of visible light photoactivated octahedrite type titanium oxide colloidal sols
  • Preparation method of visible light photoactivated octahedrite type titanium oxide colloidal sols

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0039] Example 1. Taking titanium tetrachloride as a precursor to prepare high-purity titanium dioxide sol

[0040]Measure 50ml of titanium tetrachloride in a separatory funnel, dropwise add dropwise to 200ml of water in an ice-water bath, after the dropwise addition, stir for one hour, then add dropwise the ammonia water whose initial concentration is 4M and control its addition speed, and During the process of hydrolysis and precipitation, the concentration of ammonia water was continuously reduced to a minimum of 0.05M. After the precipitation is fully hydrolyzed, use ammonia water with a concentration of 1M to adjust the pH to above 9, stir for 3 hours, filter and wash until no chloride ions are detected (tested by adding 1.0M silver nitrate solution dropwise), and then Mix the filter cake with water to prepare the concentration, add a certain amount of 10% nitric acid, adjust the pH to 1.0, stir at room temperature for 4 hours, and then heat and stir in a 65-degree water ...

example 2

[0041] Example 2. Change pH and temperature to prepare sol

[0042] Follow the steps of Example 1 to hydrolyze the precipitate, filter and wash, then mix the filter cake with water according to the required preparation concentration, add a certain amount of 8% nitric acid, adjust the pH to 1.5, stir at room temperature for 6 hours, and then heat in a 90-degree water bath After stirring for more than 3 hours, a stable sol was obtained, but it was cloudier than the sol obtained in Example 1.

[0043] Still follow the steps of Example 1 to hydrolyze the precipitate, filter and wash, then mix the filter cake with water according to the required preparation concentration, add a certain amount of 15% nitric acid, adjust the pH to 0.3, stir at room temperature for 3 hours, and then place it in a 40-degree water bath After heating and stirring for more than 10 hours, a stable sol was obtained, but it was cloudier than the sol obtained in Example 1.

example 3

[0044] Example 3. Preparation and characterization of cerium-doped titania sol

[0045] Accurately weigh a certain amount of cerium nitrate, dissolve it in 250ml of water, and freeze it below 4 degrees, measure 50ml of titanium tetrachloride and put it in a separatory funnel, add dropwise to 250ml of cerium nitrate solution in an ice-water bath, add dropwise After completion, stir for 1 hour, then add dropwise ammonia water with an initial concentration of 3.5M and control its addition rate, and continuously reduce the ammonia water concentration during the hydrolysis and precipitation process to a minimum of 0.025M. After fully hydrolyzing the precipitate, use 1.5M ammonia water to adjust the pH to above 9, stir for 4 hours, filter and wash until no chlorine ions are detected, then mix the filter cake with water according to the required preparation concentration, and add a certain amount 10% nitric acid, adjust the pH to 0.9, stir at room temperature for 4 hours, and then he...

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Abstract

The present invention relates to the preparation process of TiO2 sol with relatively high visible light activity. TiO2 sol has high dispersivity, homogeneous granularity and other advantages, and may be modified via adding RE or other transition metals to alter its energy band structure and to form photocatalytic TiO2 material capable of being excited with visible light. The present invention has improved technological process of preparing TiO2 sol, and through synthesis at low temperature and normal pressure and doping with RE or other transition metals, TiO2 sol with greatly raised visible light activity is prepared. The present invention may be applied in processing polluted atmosphere, purifying indoor air, sterilizing indoor air, sterilizing crop, etc. and has important application foreground.

Description

technical field [0001] The invention relates to the field of nano material preparation technology and application. It belongs to the preparation of titanium dioxide sol with high visible light activity, mainly the preparation of rare earth and other transition metal doped titanium dioxide sol. Background technique [0002] Vegetables, fruit trees, rice and other crops need to use a lot of fungicides in the growth process. At present, the commonly used fungicides mainly include the following categories: heterocyclics, triazoles, benzenes, organophosphorus, sulfur, copper and mercury Most of these pesticides are organic compounds with benzene ring, heterocyclic structure, organic sulfur structure, and organic heavy metal structure. After long-term application, the residues in the soil are very obvious. Specifically, at present, the following problems mainly exist in the process of using chemical pesticides: (1) Low biological activity to targets, but high toxicity to non-targ...

Claims

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Application Information

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IPC IPC(8): C01G23/047C01G23/053
Inventor 李芳柏刘同旭
Owner GUANGDONG INST OF ECO ENVIRONMENT & SOIL SCI
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