Preparation Of Nano-Titanium Dioxide Films And The Effects Of Morphology And Properties By Doping Metal Ions

In recent years, with the expanding of global industrialization, the problem of environment pollution is more and more serious. A lot of researches on this problem have been performed by chemists, physicists, and chemical engineers. Among them, semiconductor photocatalysis is a promising technology that has a variety of application in environmental system such as air purification, water disinfections, hazardous waste remediation and water purification. A new self-cleaning material can be inspired by the potential application of the hydrophilicity and titanium dioxide-based photocatalysts for the total destruction of organic compounds in polluted air and waste water.In this work, titanium dioxide thin films undoped and doped with magnesium ion or lithium ion have been prepared by sol-gel technique. SEM,UV-Vis,XRD,XPS,IR etc., have been used to characterize the thin films and powders. The hydrophilicity and photodegradation properties of methylene orange solutions exposed to UV light illumination are investigated. The main results and progresses of this thesis work are outlined as following:1. Under UV light illumination, pure titanium dioxide thin film showes the super-hydrophilicity. It is also found that the photodegradation of methylene orange is in relation of the thickness of film and photocatalytic performances would be not improved after the certain thickness.2. In the system of titanium dioxide doped with magnesium ion, it is found that magnesium ion doping can retard the polymorphic transition of titanium dioxide from anatase to rutile and the retardance is becoming stronger with the increment of...