يسر اللجنة العلمية بفسم الكيمياء فرع الطالبات ان تقدم محاضرة علمية تقدمها الدكتورة منيرة الغنيم بعنوان:
Microwave assisted synthesis of pure anatase TiO2, Ag/TiO2 and Ag/TiO2/GO nanocomposites and their photocatalytic
وذلك يوم الثلاثاء بتاريخ 14/7 الموافق 11 ابريل عند الساعه 9.15 وذلك في قاعة 1C-225
ولمزيد من التفاصيل عن المحاضرة:
ABSTRACT:
Microwave assisted synthesis of pure anatase TiO2, Ag/TiO2 and Ag/TiO2/GO nanocomposites and their photocatalytic
T. Bora,a† E. H. Alsharaeh,b A. Soliman,b M. G. Ghoniem,c K. M. Abu-Salah and J. Duttae†
A simple microwave assisted wet chemical route to synthesize pure anatase phase titanium dioxide (TiO2) nanoparticles is reported here using titanium tetrachloride (TiCl4) as starting material. The as prepared TiO2 nanoparticles are characterized by electron microscopy, X-ray diffraction, UV/visible absorption, infrared and Raman spectroscopic techniques. Further modification of the anatase TiO2 nanoparticles is carried out by incorporating plasmonic silver (Ag) nanoparticles and graphene oxide (GO) in order to improve the visible light absorption. Photocatalytic activities of the anatase TiO2, Ag/TiO2 and Ag/TiO2/GO nanocomposites are evaluated under both ultraviolet (UV) and visible light irradiation using phenol as a model contaminant. The presence of Ag nanoparticles is found to play a significant role to define the photocatalytic activity of the Ag/TiO2/GO nanocomposite. It is found that Ag acts like sink under UV excitation and store photo-generated electrons from TiO2, while under visible light excitation they act as photosensitizers enhancing the photocatalytic activity of the nanocomposite. The role of Ag nanoparticles and GO on the photo-generated charge transfer mechanism and therefore its effect on the photocatalytic activity of the Ag/TiO2/GO system is probed and discussed under both UV and visible light excitation.
