Method for preparing nano TiO2 by adding template agent through dynamic microwave method

Abstract

The invention relates to a method for preparing nano TiO2 by adding a template agent through a dynamic microwave method, which is characterized by comprising the following steps of: weighing a required amount of tetrabutyl titanate according to requirements, and mixing the tetrabutyl titanate with absolute ethyl alcohol; dissolving a certain amount of quaternary ammonium salt type surfactant intoa certain amount of deionized water; and finally, uniformly mixing the two solutions to form a reaction solution. TiO2 microspheres are generated in a microwave field, a dynamic method is adopted in the hydrolysis process, the energy input is 2.5 W / mL-3.5W / mL, the reaction solution is heated to 120 DEG C-140 DEG C and kept at the temperature to react for 1-3 h, and the TiO2 microspheres uniform insize can be prepared. The method has the advantages that the TiO2 microspheres with controllable granularity and good surface porosity are synthesized in a microwave field by utilizing a dynamic method and adding a template agent. Compared with a traditional TiO2 morphology and particle size regulation and control preparation method, the method has the advantages that the synthesis process is simple, a control effect on the particle size and the surface porosity of formed TiO2 can be achieved, and then the prepared TiO2 microspheres have good photocatalytic activity.

Description

technical field

[0001] The invention relates to a method for preparing nano-TiO with mesoporous structure by dynamic microwave method 2 The invention relates to a catalyst and a method for adjusting the morphology and particle size of the catalyst by adjusting the concentration of a template agent, belonging to the technical field of preparing photocatalyst materials. Background technique

[0002] Contemporary utilization of TiO 2 Photocatalytic degradation has attracted much attention, and the photocatalytic degradation reaction is carried out on TiO 2 On the surface of photocatalyst, because of this characteristic, for TiO 2 The catalyst surface morphology, particle size, structure and the number of surface active sites have certain requirements. Therefore, by TiO 2 It is an effective method to improve the performance of photocatalysts by adjusting the morphology and structure of photocatalysts. So far, in order to prepare more efficient photocatalysts, researchers ha...

Examples

Embodiment 1

[0016] Take 7.7mL of tetrabutyl titanate and slowly add it into 30mL of absolute ethanol while stirring under ultrasonic conditions, and drop the above mixed solution into 50mL of deionized water with a peristaltic pump with a rotation speed of 25rpm. Stir under ultrasonic conditions, and ensure that the temperature of the ultrasonic water bath is 10 ° C, measure 4 mL of CTAB with a concentration of 4 g / L and slowly add it dropwise into the prepared tetrabutyl titanate solution, and finally mix the above mixed solution with deionized water Dilute to 100mL and continue to sonicate for 10min. Take 25mL of the prepared precursor mixture and put it into the reactor. Under the condition of energy input of 50W in the ring microwave field, keep the temperature at 140°C, and continue to react for 3 hours, and keep stirring during the reaction. After the reaction, wait for the reaction The kettle was naturally cooled to room temperature, and the reaction suspension was centrifuged to o...

Embodiment 2

[0019] Take 7.7mL of tetrabutyl titanate and slowly add it into 30mL of absolute ethanol while stirring under ultrasonic conditions, and drop the above mixed solution into 50mL of deionized water with a peristaltic pump with a rotation speed of 25rpm. Stir under ultrasonic conditions, and ensure that the temperature of the ultrasonic water bath is 10 ° C, measure 4 mL of CTAB with a concentration of 8 g / L and slowly add it dropwise into the prepared tetrabutyl titanate solution, and finally mix the above mixed solution with deionized water Dilute to 100mL and continue to sonicate for 10min. Take 25mL of the prepared precursor mixture and put it into the reactor. Under the condition of energy input of 50W in the ring microwave field, keep the temperature at 140°C, and continue to react for 3 hours, and keep stirring during the reaction. After the reaction, wait for the reaction The kettle was naturally cooled to room temperature, and the reaction suspension was centrifuged to o...

Embodiment 3

[0022] Take 7.7mL of tetrabutyl titanate and slowly add it into 30mL of absolute ethanol while stirring under ultrasonic conditions, and drop the above mixed solution into 50mL of deionized water with a peristaltic pump with a rotation speed of 25rpm. Stir under ultrasonic conditions, and ensure that the temperature of the ultrasonic water bath is 10°C, measure 4mL of CTAB with a concentration of 12g / L and slowly add it dropwise into the prepared tetrabutyl titanate solution, and finally mix the above mixed solution with deionized water Dilute to 100mL and continue to sonicate for 10min. Take 25mL of the prepared precursor mixture and put it into the reactor. Under the condition of energy input of 50W in the ring microwave field, keep the temperature at 140°C, and continue to react for 3 hours, and keep stirring during the reaction. After the reaction, wait for the reaction The kettle was naturally cooled to room temperature, and the reaction suspension was centrifuged to obta...

technical field

[0001] The invention relates to a method for preparing nano-TiO with mesoporous structure by dynamic microwave method 2 The invention relates to a catalyst and a method for adjusting the morphology and particle size of the catalyst by adjusting the concentration of a template agent, belonging to the technical field of preparing photocatalyst materials. Background technique

[0002] Contemporary utilization of TiO 2 Photocatalytic degradation has attracted much attention, and the photocatalytic degradation reaction is carried out on TiO 2 On the surface of photocatalyst, because of this characteristic, for TiO 2 The catalyst surface morphology, particle size, structure and the number of surface active sites have certain requirements. Therefore, by TiO 2 It is an effective method to improve the performance of photocatalysts by adjusting the morphology and structure of photocatalysts. So far, in order to prepare more efficient photocatalysts, researchers ha...

Examples

Embodiment 1

[0016] Take 7.7mL of tetrabutyl titanate and slowly add it into 30mL of absolute ethanol while stirring under ultrasonic conditions, and drop the above mixed solution into 50mL of deionized water with a peristaltic pump with a rotation speed of 25rpm. Stir under ultrasonic conditions, and ensure that the temperature of the ultrasonic water bath is 10 ° C, measure 4 mL of CTAB with a concentration of 4 g / L and slowly add it dropwise into the prepared tetrabutyl titanate solution, and finally mix the above mixed solution with deionized water Dilute to 100mL and continue to sonicate for 10min. Take 25mL of the prepared precursor mixture and put it into the reactor. Under the condition of energy input of 50W in the ring microwave field, keep the temperature at 140°C, and continue to react for 3 hours, and keep stirring during the reaction. After the reaction, wait for the reaction The kettle was naturally cooled to room temperature, and the reaction suspension was centrifuged to o...

Embodiment 2

[0019] Take 7.7mL of tetrabutyl titanate and slowly add it into 30mL of absolute ethanol while stirring under ultrasonic conditions, and drop the above mixed solution into 50mL of deionized water with a peristaltic pump with a rotation speed of 25rpm. Stir under ultrasonic conditions, and ensure that the temperature of the ultrasonic water bath is 10 ° C, measure 4 mL of CTAB with a concentration of 8 g / L and slowly add it dropwise into the prepared tetrabutyl titanate solution, and finally mix the above mixed solution with deionized water Dilute to 100mL and continue to sonicate for 10min. Take 25mL of the prepared precursor mixture and put it into the reactor. Under the condition of energy input of 50W in the ring microwave field, keep the temperature at 140°C, and continue to react for 3 hours, and keep stirring during the reaction. After the reaction, wait for the reaction The kettle was naturally cooled to room temperature, and the reaction suspension was centrifuged to o...

Embodiment 3

[0022] Take 7.7mL of tetrabutyl titanate and slowly add it into 30mL of absolute ethanol while stirring under ultrasonic conditions, and drop the above mixed solution into 50mL of deionized water with a peristaltic pump with a rotation speed of 25rpm. Stir under ultrasonic conditions, and ensure that the temperature of the ultrasonic water bath is 10°C, measure 4mL of CTAB with a concentration of 12g / L and slowly add it dropwise into the prepared tetrabutyl titanate solution, and finally mix the above mixed solution with deionized water Dilute to 100mL and continue to sonicate for 10min. Take 25mL of the prepared precursor mixture and put it into the reactor. Under the condition of energy input of 50W in the ring microwave field, keep the temperature at 140°C, and continue to react for 3 hours, and keep stirring during the reaction. After the reaction, wait for the reaction The kettle was naturally cooled to room temperature, and the reaction suspension was centrifuged to obta...

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