Preparation process of photocatalyzing active nano TiO2 collosol

A photocatalytic activity and nanotechnology, which is applied in the direction of catalyst activation/preparation, chemical instruments and methods, physical/chemical process catalysts, etc., can solve the problems of high cost and impact on dispersibility, and achieve low price, good dispersibility, and raw materials Safe and Easy Effects

Inactive Publication Date: 2005-06-08
马贞亮
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  • Claims
  • Application Information

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Problems solved by technology

[0003] However, in practical applications, heat-treated TiO 2 powder or film, although Zhao Jincai et al. synthesized TiO by liquid-gel method or hydrothermal method 2 Powders or thin films have been widely used in the photocatalytic degradation of organic pollutants. However, their synthesis process inevitably requires high-temperature calcination in a muffle furnace, so that the obtained TiO 2 Not only the cost is high, but also due to the particle agglomeration when the calcination temperature rises, it affects the nano-TiO 2 Dispersion, which limits its application

Method used

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  • Preparation process of photocatalyzing active nano TiO2 collosol
  • Preparation process of photocatalyzing active nano TiO2 collosol
  • Preparation process of photocatalyzing active nano TiO2 collosol

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Synthetic example 1

[0014] 1. Take 3ml of tetrabutyl titanate, first dissolve it in absolute ethanol, and prepare an ethanol solution with a concentration of 0.35mol / L;

[0015] 2. Take 25ml of tetrabutyl titanate ethanol solution, and slowly drop it into 10ml of twice-distilled water at room temperature under stirring. After the dropwise addition, the water bath is heated to 70°C, and stirred at this temperature for 40 minutes;

[0016] 3. Then add 0.04mol / L HCl aqueous solution, seal the bottle mouth, and continue stirring at 70°C for 4 hours to obtain uniform and transparent TiO 2 collagen solution;

[0017] 4. The TiO obtained above 2 The collagen solution is diluted 10 times with double distilled water, and a certain amount of 2mol / L NaOH aqueous solution is added to the solution, and the pH value of the liquid is adjusted to 5, which can be directly used for the degradation of environmental pollutants in daily life and the inhibition of bacteria. Nano TiO 2 photocatalyst solution.

Synthetic example 2

[0019] 1. Take 3ml of tetrabutyl titanate, first dissolve it in absolute ethanol, and prepare an ethanol solution with a concentration of 0.35mol / L;

[0020] 2. Take 25ml of tetrabutyl titanate ethanol solution, and slowly drop it into 10ml of twice-distilled water at room temperature under stirring. After the dropwise addition, the water bath is heated to 70°C, and stirred at this temperature for 40 minutes;

[0021] 3. Then add 0.04mol / LHNO 3 aqueous solution, seal the bottle mouth, and continue to stir at constant temperature for 4 hours to obtain uniform and transparent TiO 2 collagen solution;

[0022] 4. The TiO obtained above 2 The collagen solution is diluted 10 times with double distilled water, and a certain amount of 2mol / L NaOH aqueous solution is added to the solution, and the pH value of the liquid is adjusted to 5.1, which can be directly used for the degradation of daily environmental pollutants and bacterial inhibition. Nano TiO 2 photocatalyst solution. ...

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Abstract

A photocatalytic nano-TiO2 sol for degradating the environmental pollutant, cleaning air and suppresing growth of bacteria is prepared through dissolving its precursor in alcohol, dropping water in the solution while stirring, reacting no acid solution under heating and stirring to obtain raw sol, diluting and regulating pH value. Its advantages are high photocatalytic activity and high stability.

Description

technical field [0001] The invention relates to the interdisciplinary fields of materials, nanometers, chemistry, environmental science and biology, and more specifically relates to a photocatalytically active nano-TiO 2 Sol preparation method. Background technique [0002] Since Fujishima and Honda first discovered the photocatalytic properties of nano-semiconductor materials in 1972, this field has aroused great interest and research enthusiasm among scientists, and has become one of the most active research directions at present. Semiconductor particles have an energy band structure, generally composed of a low-energy valence band (Valence Band, VB) filled with electrons and an empty high-energy conduction band (Conduction Band, CB), and there is a forbidden band between the valence band and the conduction band. When the semiconductor is irradiated with light having an energy equal to or greater than the forbidden band width (Eg), the electrons in the valence band (e - ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J21/06B01J37/03C01G23/053
Inventor 何治柯刘志洪王靖宇余军霞蔡汝秀
Owner 马贞亮
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