Method for preparing TiO2-PS nucleocapsid structure nano powder by microwave assisted hydrothermal method

Abstract

The invention provides a method for preparing nanometer beads of TiO2-PS core-shell structure by microwave hydrothermal which comprises the following steps: (1) a PS bead microemulsion is prepared or purchased with the diameter between 10nm and 999nm; (2) the PS bead micro-emulsion and tetrabutyl titanate are mixed according to certain ratio, ionic water or alcohol or organic acid is added to carry out hydrolysis, alcoholysis or acidolysis towards the tetrabutyl titanate; ammonia water is added during the hydrolysis process and deionized water is used for dilution; the microemulsion of TiO2-PS core-shell former body is obtained after 1 hour of ultrasonic vibration, heating, boiling and reflux; (3) the microemulsion of TiO2-PS core-shell former body prepared is transferred to a microwave hydrothermal reaction device to react, so as to obtain the nanometer microemulsion of TiO2-PS core-shell structure; (4) the nanometer microemulsion of TiO2-PS core-shell structure prepared is dried in an oven to obtain the nanometer beads of TiO2-PS core-shell structure. The method of the invention has the advantages of fast nucleation growth of the nano-crystalline, short reaction period, low energy consumption, etc.

Description

technical field

[0001] The present invention relates to a kind of TiO 2 -Microwave hydrothermal rapid preparation method of PS (titanium dioxide-polystyrene) core-shell structure nanospheres, belonging to TiO 2 - PS nano powder preparation technical field. Background technique

[0002] Titanium dioxide (TiO 2 ) is a wide bandgap semiconductor material, which generally has rutile phase, anatase phase and brookite phase. Brookite TiO 2 No photocatalytic activity, rutile TiO 2 The activity is also low. Experiments show that anatase TiO 2 Catalyzes the production of H 2 The rate is rutile TiO 2 7 times. This is because on the one hand the rutile TiO 2 The band gap is small (rutile TiO 2 The forbidden band width is 3.1eV, while that of anatase is 3.3eV), and its positive conduction band hinders the O 2 reduction reaction; on the other hand, rutile TiO 2 It is the most stable crystal structure form, with a relatively complete crystal structure, small defects, photoindu...