A method for preparing nano-titanium dioxide with high photocatalytic activity by using waste wool

Abstract

The invention discloses a method for preparing high-photo catalytic active nanometer titania by using waste wool. The method comprises the following steps: hydrolyzing wool under an acidity condition to generate amino acid small molecular substances, and performing doping modification on nanometer titania crystalline grains produced in the hydrothermal reaction process, covering a layer of organic substance film on the surface of the crystalline grains to prepare the nanometer titania with high-photo catalytic performance. Through the adoption of the hydrothermal method, the wool short fiber is added in the low-temperature hydrothermal and strong-acidity environment, in the growing process of the nanometer titania crystals, the wool fiber is synchronously hydrolyzed to generate the small molecular organic substances, thereby hybridizing the nanometer titania crystalline grains and performing the surface graft modification without adding other chemical reagents or surfactants; the preparation process is simple, the solution is neutral finally, and the emission cannot cause secondary pollution to the environment.

Description

technical field

[0001] The invention belongs to the technical field of textile engineering, and in particular relates to a method for preparing nano titanium dioxide with high photocatalytic activity by using waste wool. Background technique

[0002] The photocatalytic properties of titanium dioxide have been widely used in anti-ultraviolet materials, textiles, photocatalysts, autocatalysts, etc. Clean glass, sunscreen, paint, ink, food packaging materials, paper industry, aerospace industry, lithium battery and other industries. Hydrothermal synthesis technology is an important method for preparing nano-oxides. The hydrothermal method can not only prepare some single-component tiny crystals, but also prepare two-component or multi-component materials, which can overcome certain high temperature Unavoidable hard agglomeration and other unfavorable factors, studies have shown that the energy band position of titanium dioxide and the reduction potential of the adsorbed substa...

Examples

Embodiment 1

[0047] Measure 5mL of tetrabutyl titanate and dissolve it in 5mL of absolute ethanol solution, and keep stirring, then slowly add 70mL of deionized water and stir rapidly to form a white milky transparent solution Adjust the pH value of the solution with hydrochloric acid is 1. According to the bath ratio of 1:30, weigh waste wool, and prepare it with 30% hydrogen peroxide 10ml / L, sodium carbonate 0.5g / L and sodium silicate 0.5g / L at 50°C and pH value 8.5. The mixed solution was treated for 30 minutes, then soaked in 30°C absolute ethanol solution for 10 minutes, rinsed once with deionized water, and finally dried at 80°C. Cut the washed wool into short fibers with a length less than 5mm with a rotary twisting knife type fiber cutter. Weigh short wool fibers according to 1% of the amount of tetrabutyl titanate, add them to the precursor solution, soak them for 5 minutes, and transfer them to a high-temperature and high-pressure reactor. The volume of the solution accounts for...

Embodiment 2

[0049] Measure 5mL of tetrabutyl titanate and dissolve it in 5mL of absolute ethanol solution, and keep stirring, then slowly add 70mL of deionized water and stir rapidly to form a white milky transparent solution Adjust the pH value of the solution with hydrochloric acid for 2. According to the bath ratio of 1:50, weigh a certain amount of waste wool, and prepare it with 30% hydrogen peroxide 20ml / L, sodium carbonate 2g / L and sodium silicate 2g / L at 60°C and pH value 9.5. The resulting mixed solution was treated for 50 minutes, then soaked in 50°C absolute ethanol solution for 20 minutes, rinsed with deionized water for 3 times, and finally dried at 110°C. Cut the washed wool into short fibers with a length less than 5mm with a rotary twisting knife type fiber cutter. Weigh short wool fibers according to 10% of the amount of tetrabutyl titanate, add them to the precursor solution, soak them for 10 minutes, and then transfer them to a high-temperature and high-pressure reacto...

Embodiment 3

[0051] Measure 5mL of tetrabutyl titanate and dissolve it in 5mL of absolute ethanol solution, and keep stirring, then slowly add 70mL of deionized water and stir rapidly to form a white milky transparent solution Adjust the pH value of the solution with hydrochloric acid is 1.5. According to the bath ratio of 1:40, weigh a certain amount of waste wool, and use 15ml / L of hydrogen peroxide with a mass concentration of 30%, 1.5g / L of sodium carbonate, and 1g / L of sodium silicate at 55°C and a pH value of 9. The prepared mixed solution was treated for 40 minutes, then soaked in 40°C absolute ethanol solution for 15 minutes, rinsed twice with deionized water, and finally dried at 100°C. Cut the washed wool into short fibers with a length less than 5mm with a rotary twisting knife type fiber cutter. Weigh short wool fibers according to 6% of the amount of tetrabutyl titanate, add them to the precursor solution, soak them for 8 minutes, and transfer them to a high-temperature and h...

technical field

[0001] The invention belongs to the technical field of textile engineering, and in particular relates to a method for preparing nano titanium dioxide with high photocatalytic activity by using waste wool. Background technique

[0002] The photocatalytic properties of titanium dioxide have been widely used in anti-ultraviolet materials, textiles, photocatalysts, autocatalysts, etc. Clean glass, sunscreen, paint, ink, food packaging materials, paper industry, aerospace industry, lithium battery and other industries. Hydrothermal synthesis technology is an important method for preparing nano-oxides. The hydrothermal method can not only prepare some single-component tiny crystals, but also prepare two-component or multi-component materials, which can overcome certain high temperature Unavoidable hard agglomeration and other unfavorable factors, studies have shown that the energy band position of titanium dioxide and the reduction potential of the adsorbed substa...

Examples

Embodiment 1

[0047] Measure 5mL of tetrabutyl titanate and dissolve it in 5mL of absolute ethanol solution, and keep stirring, then slowly add 70mL of deionized water and stir rapidly to form a white milky transparent solution Adjust the pH value of the solution with hydrochloric acid is 1. According to the bath ratio of 1:30, weigh waste wool, and prepare it with 30% hydrogen peroxide 10ml / L, sodium carbonate 0.5g / L and sodium silicate 0.5g / L at 50°C and pH value 8.5. The mixed solution was treated for 30 minutes, then soaked in 30°C absolute ethanol solution for 10 minutes, rinsed once with deionized water, and finally dried at 80°C. Cut the washed wool into short fibers with a length less than 5mm with a rotary twisting knife type fiber cutter. Weigh short wool fibers according to 1% of the amount of tetrabutyl titanate, add them to the precursor solution, soak them for 5 minutes, and transfer them to a high-temperature and high-pressure reactor. The volume of the solution accounts for...

Embodiment 2

[0049] Measure 5mL of tetrabutyl titanate and dissolve it in 5mL of absolute ethanol solution, and keep stirring, then slowly add 70mL of deionized water and stir rapidly to form a white milky transparent solution Adjust the pH value of the solution with hydrochloric acid for 2. According to the bath ratio of 1:50, weigh a certain amount of waste wool, and prepare it with 30% hydrogen peroxide 20ml / L, sodium carbonate 2g / L and sodium silicate 2g / L at 60°C and pH value 9.5. The resulting mixed solution was treated for 50 minutes, then soaked in 50°C absolute ethanol solution for 20 minutes, rinsed with deionized water for 3 times, and finally dried at 110°C. Cut the washed wool into short fibers with a length less than 5mm with a rotary twisting knife type fiber cutter. Weigh short wool fibers according to 10% of the amount of tetrabutyl titanate, add them to the precursor solution, soak them for 10 minutes, and then transfer them to a high-temperature and high-pressure reacto...

Embodiment 3

[0051] Measure 5mL of tetrabutyl titanate and dissolve it in 5mL of absolute ethanol solution, and keep stirring, then slowly add 70mL of deionized water and stir rapidly to form a white milky transparent solution Adjust the pH value of the solution with hydrochloric acid is 1.5. According to the bath ratio of 1:40, weigh a certain amount of waste wool, and use 15ml / L of hydrogen peroxide with a mass concentration of 30%, 1.5g / L of sodium carbonate, and 1g / L of sodium silicate at 55°C and a pH value of 9. The prepared mixed solution was treated for 40 minutes, then soaked in 40°C absolute ethanol solution for 15 minutes, rinsed twice with deionized water, and finally dried at 100°C. Cut the washed wool into short fibers with a length less than 5mm with a rotary twisting knife type fiber cutter. Weigh short wool fibers according to 6% of the amount of tetrabutyl titanate, add them to the precursor solution, soak them for 8 minutes, and transfer them to a high-temperature and h...

Images