ساخت نانو ذرات دي اكسيد تيتانيم آلاييده با نيتروژن

Visible-Light active N-doped TiO2 prepared by reaction of TiO2.nH2O and urea

در اين تحقيق نانو ذرات پودري دي اكسيدتيتانيم آلاييده با نيتروژن توسط واكنش دماي بالاي اوره وTiO2.nH2o به هدف جذب اپتيكي در ناحيه طيف مرئي ساخته شده است . هدف از ساخت اين نمونه ها افزايش جذب اپتيكي در ناحيه مرئي است . لبة جذب اپتيكي نمونه ها تغييري به سمت طول موجهاي بلندتر ( در حد 550 نانومتر ) داشته است . سطح ويژه نانو ذرات ساخته شده در حدود 51 m 2 /gr گ زارش شده است . روش هاي مشخصه يابي مطرح شده در اين تحقيق عبارت از طيف سنجي بازتاب نفوذي(Diffused reflectance)پراش اشعه ايكس (XRD) ، ، تصوير الكتروني روبشي BJH و BET ، (SEM) مي باشد .

Titanium Dioxide photo catalysis is now being used in practical applications such as self-cleaning sterilization, deodorizing and air-cleaning. It is chemically and photo chemically stable, but is only excited by ultraviolet light so that the light utilization efficiency to solar irradiation and a fluorescent lamp is very low. Therefore, attempts were made to extend the absorption range of titanium dioxide into the visible-light region by different methods. We prepared N-doped TiO2 powders that respond to visible-light by high temperature reaction of TiO2.nH2O, prepared by the hydrolysis of Tetraisopro pylorthotitinat with urea. We studied the effect of time and temperature and different weight ratios of urea/TiO2.nH2O and we found that our best sample was the one with 500c heat treatment for 2h and in this sample the weight ratio of urea/TiO2.nH2O was 1. The absorption edge of the samples shifts toward a longer wavelength (about 550 nm). The nanop articles had a relative specific surface area of about 51m2gr-1.We used Diffused Reflectance, , XRD, SEM,BET and BJH for analysis