Study On Modified Nano Doped-TiO₂ And Application To Bombing Factory's Discharging Water

At present, nano- TiO₂ photocatalysis technology applied in extensive prospect of chemistry .physics, materials, environment, energy resources and so on. There are highly efficiency of dispose, simple of technology equipment, easy to condition control .degradation organic pollutants of without choices and further pollution, nano- TiO₂ degradation to pollutants , so nano- TiO₂ stirs up widely attention.In this thesis , the nano- TiO₂ were prepared from (TiOC₄H₉)₄ by hydrolysis alkoxides progress, and rare earth doped to modified nano- TiO₂. Researched crystal composite, particle size and photocatalytic activity of nano- TiO₂ by experiments . Experiment results found that dry pattern have marked effect to nano- TiO₂ of crystal composite, particle size and photocatalytic activity under high temperature preparation condition. The results of XRD, TEM analysis showed that: vavuum dry and supercritical multicomponent dry nano- TiO₂ maintains anatase crystal particle, particle size is about 50nm by 850℃ preparation condition; nano- TiO₂ have quite good photocatalytic activity according to degradation of methyl orange.Through the doped nano- TiO₂, prepared such as Y-doped rare earth and SiO₂ B₂O₃, isolated nano-SiO₂ of nano- TiO₂ particles. All these materials show the potential of promoting the ability of photocatallysis of TiO₂, especially after calcinations under high temperature , the doped nano-TiO₂ sustain a good potential of photocatalysis. Applying orthogonal design and response nurbs method deeply studied the doped mass of SiO₂, calcinations temperature, way of drying and these impacts to the photocatalysis ability of nano- TiO₂ including the principles. Resultd showed that: the doped mass of SiO₂ is 9. 0%, nano- TiO₂ obtains the best ability of photocatalysis under the condition of infrared-drying and calcination in 850℃. By means of XRD, TEM, nano- TiO₂ is the type of rutile, under above conditions, size of particle is about 20nm. All these indicated the method of doping SiO₂ to TiO₂, promting TiO₂' s turning temperature of TiO₂' s type, while restains the particles growth.Prepared doped nano- TiO₂ under high temperature, nano- TiO₂ obtain a good potential of photocatalysis, preparing compound material with SiO₂ doped nano- TiO₂, studied the practical application of nano- TiO₂. compared the following differences including: ceramics, compound technology, compound mass and compound particles, for material' s activity of photocatalysis. By means of XRD, SEM, X-sapphire analysis, indicated that: after calcinations...