Preparation Of Doped TiO₂Nano Powders And Their Photocatalytic Pefrormance

Water is the source of life, the foundation of survival, the rapid developmentof the economy of population growth and reproduction generation after generation,the need for water increased sharply. And in the face of more and more serious waterpollution problems, we must take measures to governance, emerging researchsemiconductor catalyst production, research and development to solve the problem ofthe management of water resources, for pure titanium dioxide nano research for a longperiod of time, and tend to mature; In recent years, the doping of TiO2nano powderand the changes of the nature of the doping has become a new focus on hot spots.Intrinsic titanium dioxide nano powder in the process of practical application still hassome problems and difficulties to be solved, some basic research—Metal ions dopedTiO2nano powder preparation and photocatalytic performance of the research.Prepared using sol-gel method the doped TiO2nanoparticles of Cu、Fe、Zn,And the preparation of nanometer composite samples by XRD, The results provedthat the preparation of product is anatase TiO2, And there is no other phase.Combining XPS results can determine various kinds of doping ions successfullyadded to the lattice of TiO2or formed in the interface of lattice zinc-O-Ti keys, Anddetermine the doped TiO2nanoparticles of elements after the metal ions. The FESEMobservation on the samples at the same time, the particle size of TiO2grain size wehave is about10nm to50nm and crystal morphology.We the uv-vis absorption spectra of samples testing, by absorption spectra cansee TiO2has strong absorption in ultraviolet band, doping caused with the edge of thered shift phenomenon, forbidden band width decreases, and changed the performanceof catalyst, the catalyst can be better absorbed light source.Our TiO2doped metal ions as photocatalyst, under uv light source, theexperiments on degradation of organic dyes, methyl orange, and concluded that thedoping metal ions accumulation on the surface of TiO2and many TiO2nanoparticlescan generate the Schottky barrier between, due to the formation of such energy barrier is greatly promoted the separation of light raw charge, or generate a large number ofredox ability very strong-OH, very good inhibited the light composite raw electronic-hole. To a certain extent, increased the ability of TiO2photocatalytic degradation ofmethyl orange. On the TiO2has its own optimal dosage, doping amount is too low, theeffect is not significant; Doping amount is too high, will lead to increase of internaldefects in the lattice, it will impact on the ability of TiO2photocatalytic degradation ofmethyl orange.