Preparation Of Gd Doped And Gd,N Co Doped TiO₂ And Its Performance Research

With the development of industry,water pollution problems become more and more prominent.The preparation of good performance of photocatalyst to degrade wastewater is an effective way.However,due to TiO₂ photocatalyst has characteristics of strong redox ability,stable chemical properties,low cost,non-toxic and so on,it has been widely used in the field of photocatalytic degradation of pollutants.However,TiO₂ has some disadvantages such as small specific surface area,easy agglomeration and large band gap,which can only absorb UV radiation,it hinders the further application of TiO₂ photocatalyst in photocatalytic degradation of pollutants.Therefore,to reduce the size of TiO₂ crystal and enlarge the visible light response of TiO₂ photocatalyst can improve the practicability of TiO₂.In addition,the photocatalytic activity of TiO₂ can be applied to the ceramic coating,which can improve the self-cleaning performance of ceramics.The principle of preparation of TiO₂ photocatalyst by sol-gel method is to dissolve titanium metal alkoxide in organic solvent,adding water and inhibitor,after hydrolysis,condensation and other reactions gradually form a transparent sol,in the process of aging,the hydroxyl condensation occurs,and then the water loss condensation and the loss of alcohol condensation,forming a threedimensional network structure,becoming a gel,the gel by drying and sintering process to prepare TiO₂ powder photocatalyst.This paper used the method of sol-gel to prepare Gd doped,N doped and Gd/N co doped TiO₂ powder photocatalyst,Using XRD,TEM and other instruments to show the morphology of its organization characterization,to test its optical properties,it also investigated the effects of doping amout and calcination temperaure on the degradation of methyl orange,revealed the mechanism of photocatalytic activity of Gd/N doped TiO₂.The photocatalytic applications of TiO₂ mainly use dipping method to prepare Gd-TiO₂,Gd/N-TiO₂ thin film on ceramic respectively,showed hydrophilicity,and photocatalytic preperties,so as to improve the self-cleaning performance of thin film ceramic.The experimental conclusions are following.1.The Gd/N co-doped TiO₂ powder was prepared by sol-gel method.The grain size was about 9.0 nm,the forbidden band width was 3.15 eV,the fluorescence emission of Gd/N-TiO₂ intensity was 30.1% higher than that of TiO₂.1.5% Gd-TiO₂ under uv conditions on the degradation of methyl orange was at a rate of 100%.The degradation rate of methyl orange was 68.54% under 7.6h in visible light.2.Under the condition of visible light Gd 0.5%/8.0% N-TiO₂ the first,second and third cycle of degradation of methyl orange degradation rate were 67.64%,65.86% and 63.65%,respectively,it is over 30% after the 10 cycle,Gd/N-TiO₂ has the ability to recycle the methyl orange.3.The photocatalytic activity of Gd-TiO₂ and Gd/N-TiO₂ was applied to the ceramic,and the degradation rate of methyl orange on the ceramic surface was 54.63% after 4 h irradiation with 0.1% Gd/8.0%N-TiO₂ film under visible light,And the hydrophilic angle reduced from 43.37°to 40.32° after 10 min of visible light,which indicated that 0.1% Gd/8.0% N-TiO₂ self-cleaning proformance of thin film ceramics were improved.In a word,Gd/N doped TiO₂ prepared by sol gel method,has good photocatalytic properties under the visible light,Gd/N-TiO₂ coated on ceramics under the condition of visible light have a hydrophilic performance and the degradation of methyl orange so plating Gd/N-TiO₂ coated on ceramics self-cleaning performance.