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Preparation of Nano- TiO_2 and hot water solution Films

Author: YuYanFen
Tutor: ChaiLiYuan
School: Central South University
Course: Environmental Engineering
Keywords: Industrial liquid titanium Nano-TiO2 Hot Water Solution Surfactants TiO2 thin film
CLC: O614.411
Type: Master's thesis
Year: 2005
Downloads: 205
Quote: 1
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Abstract


Nano-TiO 2 has unique physical and chemical properties, widely used photocatalyst, photoelectric conversion material, UV absorbers, gas sensors, environmental protection and many other fields. Nano-TiO 2 is a low-cost nano-materials preparation technology was first applied to solve the key technology. In this paper, cheap industrial TiOSO 4 as raw material, hot water solution around Nano TiO 2 and the film launched a more systematic study. Solution in hot water system, the hydrolysis conditions on TiOSO 4 hydrolysis rate and TiO 2 particle size significantly affect results showed that fluid acidity titanium, titanium concentration, hydrolysis time and hydrolysis temperature and other factors directly affect the nano-TiO 2 particle size and particle size distribution, when the initial titanium concentration was 28g · L -1 , H < / sup> of 2.8mol · L -1 , hydrolysis temperature is 125 ℃, hydrolysis time was 60min, the rate of hydrolysis of titanium liquid can reach more than 96%, TiO 2 powder particle size of about 120nm. Common surfactants on nano-TiO 2 dispersion performance impact, they help to reduce TiO 2 powder size, reduce agglomeration. Wherein the surfactant compound affected, adding 1.0wt? S 0.5wt% PEG6000 powder obtained after the particle size of 40-55nm, and is more evenly distributed: anionic surfactant of Second, adding 1.5wt? S 75nm diameter of the powder prepared so; non-ionic surfactants can reduce agglomeration of the powder, adding 2.0wt% of PEG6000 obtain powder of about 90-10nm particle size; cationic surfactants influence the agglomeration of the powder min, after adding 1.0wt% TEA slightly lower degree of powder agglomeration, the obtained powder at between 100-120nm, and still there is a certain soft aggregates. Preparation can not be recycled after use powder containing fine particles of colloidal liquid waste as raw materials by impregnation. Pulling prepared nano-TiO 2 film. The results show that the obtained nano-TiO 2 film at less than 750 ℃ ??heat treatment after 1h are stable crystalline anatase phase, SEM analysis showed that the film has a dense structure and the substrate tightly; film with light-induced hydrophilicity and thermal induced hydrophilicity, light and photocatalytic activity of 5-layer film heat-treated at 500 ℃ for 1h, at 600 ~ 800nm ??wavelength range of light transmission rate of 90%, five-layer film coated 3.5h glass by ultraviolet irradiation on the degradation rate of methyl orange reached 95%.

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CLC: > Mathematical sciences and chemical > Chemistry > Inorganic Chemistry > Metal elements and their compounds > Section Ⅳ group metal elements and their compounds > The titanium Vice family ( IV B group metal elements) > Ti Ti
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