摘要
A new smooth potassium dititanate film was prepared by sol-gel method and characterized by thermogravimetry(TG)and differential scanning calorimetry(DSC),X-ray diffraction(XRD),atomic force microscopy(AFM),UV-Visible diffuse reflectance and Raman spectroscopy.The gaseous photocatalytic activity of smooth K_(2)Ti_(2)O_(5)films was studied using contact angle analysis from the photocatalytic decomposition of octadecyltrichlorosilane(OTS)based self-assembled monolayers(SAMs)formed on K_(2)Ti_(2)O_(5)films.The photocurrent response of the film was determined by an electrochemical method.It was shown that the films were smooth,compact,and transparent when formed on glass.Compared with TiO_(2)film,the K_(2)Ti_(2)O_(5)film showed wide absorption in the ultraviolet and visible region.It was found that the monolayers on K_(2)Ti_(2)O_(5)decomposed much faster than those on TiO_(2)under UV irradiation of 254 nm in air.The film also exhibited a stronger photoresponse and a more stable anodic photocurrent.The K_(2)Ti_(2)O_(5)film efficiently decomposes the alkylsiloxane monolayers under UV irradiation in air and it was found to be a good photocatalyst for gaseous organic pollutant treatment.
基金
supported by the National Natural Science Foundation of China(Grant Nos.20246002,20376032,20236010 and 20676062)
Chinese National Science Foundation for Outstanding Young Scholars(29925616)
National High Technology Research and Development Program of China(Nos.2003CB615700,2003AA333010 and 2006AA03Z455)
Joint Research Fund for Young Scholars in Hong Kong and Abroad(20428606)
the Key Science Foundation of Jiangsu Province,China(BK 2004215).
