Nature of corona in TiO2@SBA15-like mesoporous nanocomposite
TiO2@SBA15-like mesoporous nanocomposite, where the symbol @ indicates inclusion, were prepared by introducing Ti by a grafting technique (TiO2 loadings about 10％ wt.) and characterized by different methods. Three different Ti species were evidenced to be present. The first two derive from the reaction of Ti with silanol groups in the corona area of inner SBA15-like walls leading to the formation of either TiO4 tetrahedral sites and/or pseudooctahedral surface sites anchored by two (or more) Si or Ti ions through bridging oxygen. The third species derives from the reaction of Ti in the regions with high silanol density, e.g. in the micropores located in the corona of SBA15-like channels, leading to the formation of TiO2- like nanoareas with dimensions of around 1-2 nm and having characteristics different from those of crystalline titania as shown by FTIR data.
S. Perathoner P. Lanzafame G. Centi F. C. Jentoft Tz. V. Venkov R. Schl(o)gl
Dept. Of Ind. Chemistry and Eng of Materials, Univ. Of Messina, UdR INSTM & ELCASS(European Laborato Dept. Inorganic Chem., Fritz Haber Institute of the Max Planck Society and ELCASS,Faradayweg 4-6, D-
国际会议
北京
英文
2007-08-12（万方平台首次上网日期，不代表论文的发表时间）