Titania(TiO₂) possess interesting catalyst, optical, and dielectric properties, which results in industrial applications such as pigments, filters, catalyst supports, and photocatalyst. Control of the size, shape and structure of the colloidal precursor is an important factor in determining the prop...
Titania(TiO₂) possess interesting catalyst, optical, and dielectric properties, which results in industrial applications such as pigments, filters, catalyst supports, and photocatalyst. Control of the size, shape and structure of the colloidal precursor is an important factor in determining the properties of the final material. In the presence of water, alkoxides hydrolyze and subsequently polymerize to form a three-dimensional oxide network. These reactions can be schematically represented ac follows : Ti(OR)_(4) + 4H₂O → Ti(OH)_(4) + 4ROH (hydrolysis) Ti(OH)_(4) → TiO₂·xH₂O + (2-x)H₂O (condensation) In this study, titania particle size, crystalline structure and photocatalytic activity were studied as a function of synthesis temperature and removed the alcohol in byproduct of hydrolysis titanium alkoxide using sol-gel process. Water/ alkoxide ratio was fixed in 100 and pH = 1.5 (used in nitric acid). The titania were characterized by X-ray diffraction(XRD), scanning electron microscopy(SEM), and particle size distributor. Photocatalytic activity tests were batch type reactor for formaldehyde(HCHO) removal at room temperature under UV irradiation. As increasing the reaction temperature from 50℃ to 80℃, the average particle size was increased. In addition, crystalline structure was changed from amorphous to anatase structure, and particle shape was spherical type in all conditions. In case of removed the alcohol in byproduct of hydrolysis titanium alkoxide, particle size was less than not removed and crystal form was more crystallized than not removed. Photocatalytic degradation of formaldehyde in gas phase was investigated with coated titania sol in soda lime glass under UV irradiation. With increasing the reaction temperature, the photocatlaytic degradation of formaldehyde was increased. However, removed the alcohol in byproduct of hydrolysis titanium alkoxide were more activity than not removed. In the past, photocatalytic activity was determined by particle size, and small size rather than large. However, from our studies, we could know that the photocatalytic activity was fallen off although a particle size was so small. In addition, we could know that the alcohol in byproduct of hydrolysis titanium alkoxide were disturbed the crystal growth and increased the particle size.
Titania(TiO₂) possess interesting catalyst, optical, and dielectric properties, which results in industrial applications such as pigments, filters, catalyst supports, and photocatalyst. Control of the size, shape and structure of the colloidal precursor is an important factor in determining the properties of the final material. In the presence of water, alkoxides hydrolyze and subsequently polymerize to form a three-dimensional oxide network. These reactions can be schematically represented ac follows : Ti(OR)_(4) + 4H₂O → Ti(OH)_(4) + 4ROH (hydrolysis) Ti(OH)_(4) → TiO₂·xH₂O + (2-x)H₂O (condensation) In this study, titania particle size, crystalline structure and photocatalytic activity were studied as a function of synthesis temperature and removed the alcohol in byproduct of hydrolysis titanium alkoxide using sol-gel process. Water/ alkoxide ratio was fixed in 100 and pH = 1.5 (used in nitric acid). The titania were characterized by X-ray diffraction(XRD), scanning electron microscopy(SEM), and particle size distributor. Photocatalytic activity tests were batch type reactor for formaldehyde(HCHO) removal at room temperature under UV irradiation. As increasing the reaction temperature from 50℃ to 80℃, the average particle size was increased. In addition, crystalline structure was changed from amorphous to anatase structure, and particle shape was spherical type in all conditions. In case of removed the alcohol in byproduct of hydrolysis titanium alkoxide, particle size was less than not removed and crystal form was more crystallized than not removed. Photocatalytic degradation of formaldehyde in gas phase was investigated with coated titania sol in soda lime glass under UV irradiation. With increasing the reaction temperature, the photocatlaytic degradation of formaldehyde was increased. However, removed the alcohol in byproduct of hydrolysis titanium alkoxide were more activity than not removed. In the past, photocatalytic activity was determined by particle size, and small size rather than large. However, from our studies, we could know that the photocatalytic activity was fallen off although a particle size was so small. In addition, we could know that the alcohol in byproduct of hydrolysis titanium alkoxide were disturbed the crystal growth and increased the particle size.
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