Preparation method of crystal phase controllable three dimensional hierarchical structure photocatalytic material

Abstract

The invention involves preparation method of three-dimensional network hierarchy photocatalysis materials which crystal phase can be controlled. The method bases on biological template synthesis technology, uses bird eggshell membrane as biological template material, dips the eggshell membrane into titanates prodromal liquid to handling the dip optimization after separating, washing and pretreating the eggshell membrane, then oxygenizes and incandesces it to forming titania nanometer crystal under the action of biological template in original position, then prepares nanometer titania with excellent performance and three-dimensional network hierarchy as photocatalysis material. The prepared photocatalysis material consists of mixing-phase titania crystal grain which grain size is below 20nm, the component percentage of anatase phase and rutile phase can be controlled by adjusting the pH of steeping liquor. The process of the invention is simple, cost is low and the performance of prepared photocatalysis material is stable; it can be used for gas sensor, pressure-active element, nonlinear optical material, solar battery and environmental purification material, it also has good prospect in the electrical, electronic, industrial and civil fields.

Description

technical field [0001] The invention relates to a method for preparing a three-dimensional network hierarchical structure photocatalytic material with controllable crystal phase, and prepares a titanium dioxide nanometer photocatalytic semiconductor material with a special braided three-dimensional network hierarchical nanostructure, high specific surface area and controllable crystal phase composition , belonging to the field of new material technology. Background technique [0002] In recent years, with the gradual maturity of nano-synthesis technology, the development and utilization of new nano-semiconductor materials have attracted widespread attention. Among them, titanium dioxide (TiO 2 ) has become one of the photoelectric semiconductor materials with the most potential application value due to its good photoelectric performance, chemical stability, wear resistance and corrosion resistance, and non-toxicity. Currently, nano-TiO 2 It has been widely used in many te...

AI Technical Summary

Problems solved by technology

For example, the title of Chinese patent 02104344.2 is: "Method for controlling the crystal form of nano-titanium dioxide and the nano-titanium dioxide obtained therefrom" and the title of patent 200610012458.4 is "A method for preparing nano-scale titanium dioxide by controlling the crystal form", and the process is difficult to avoid long preparation period , high cost, and high energy consumption of high-temperature roasting, although the grain size has a certain degree of control, it still does not reach the ideal size, and the particles are easy to agglomerate and it is difficult to achieve a special hierarchical morphology at the nanometer level, which is difficult for industrial promotion.