Modification And Application Study Of Photocatalyst Titanium Dioxide

The modification by doping,preparing and application of titanium dioxide has been mainly studied in the paper,which content have been divided into five parts.In first part,nanometer titania photocatalyst was synthesized by means of Sol-gel using tetrabutyl titanate as material and acetylacetone as inhibitor to study its photocatalytic performance through degrading methyl orange.Both the influence of synthesis condition on titania crystal structure,granularity and the influence of calcination on crystal structure were studied.The results show that when the amount of acetylacetone is 1ml and the hydrolysis temperature is 40℃,the photocatalytic performance is the most,and granularity is the smallest;when firing at 400℃,the anatase titanium dioxide was mainly formed and the rutile has appeared a little.In second part,by means of sol-gel,simply employe a kind of element to prepare nanometer Titania.Use Fe to modify titania.The results show that the Titania's construction get polished up,which would have more hydroxyl radicals,0.5wt%of doping Fe,firing at 500℃,the granularity is small and appear complex body,so the most photocatalytic performance can get.Degradation radio of methylene orange is 97.6%in two hours.Use Y to modify titania,which are studied rarely.The results show that 1 wt%of doping Y,firing at 500℃,the most performance can get,98.7%.After doping,titania's constructions will get improved,and more hydroxyl radical lie on surfaces.Use N to modify titania,the results show that 0.5%of doping N,firing at 450℃, the photocatalytic performance are the most in the visual lights region.The degradation radio of methylene orange is 72.3%.Preparation of co-doping nanometer titania with two kinds of elements.Use Fe,Y to modify titania.The results show that the construction is varied as to doping.The granularity get smaller,the absorbance peaks move forward long waves, the ability of absorbance get stronger,the surface would have more hydroxyl radicals. Greatly,the degradation of methylene orange got improved.When the amount of Fe and Y are 0.2%and 0.8%,the degradation radio of 99.3%can get in 1.5h.Use Y,N to modify titania.The results show that apparent response to the visual light can see,and the granularity get smaller.When the doping amount of Y,N is 0.8% and 0.5%,respectively,the degradation radio of 99.8%can get in 1.5h.In third part,using mechanochemistry to modify TiO₂ with the materials of Fe(OH)₃.in 40 minutes,the photocatalytic performance get more with continuous ball-milling,the most is got,86.2%in 70min.after modification,the separation of electrons and holes get higher,in the end,improve the performance.In fourth part,TiO₂-supported photocatalyst on zeolite and ball have been prepared by means of sol-dipping.TiO₂ supported on zeolite are stable and can reuse. The supported amount is 2.98%,its first performance of degradation can get 91.2%, though the performance fallen later,but it can still get above 80%.TiO₂-supported photocatalyst on alumina ball have been prepared by means of sol-dipping.The results show that the degradation radio of alumina ball is better than pure titania,the degradation radio of TiO₂ supported and TiO₂ non-supported on alumina are 99.7%and 78.1%,the degradation radio are 90.4%and 57.3%, respectively.In fifth part,select TiO₂ to degrade coked industrial sewage,Water treated have been in conformity with discharging criterion(GB8978-96).As adding TiO₂ 100mg, the photocatalytic performance of TiO₂ get most;as pH is lower,it is beneficial for photocatalytic degradation;as the concentration of raw wastewater is lower,the degradation rate is the fastest.Photocatalytic technology has a greatly wide industrial prospect in treating industrial wastewater of coked industrial sewage.