POM—APS—TiO_2杂化光催化剂的制备及表征

Preparation and characterization of POM-APS-TiO_2 hybrid catalysts

采用自组装技术合成负载型多酸—有机胺—二氧化钛杂化催化剂K_5[Mn(H_2O)PW_(11)O_(39)—APS—TiO_2],[APS=(C_2H_5O)_3SiCH_2CH_2CH_2NH_2],通过XRD、FT—IR和元素分析等手段,对其组成和结构进行表征。结果表明:该杂化催化剂中Keggin阴离子的基本结构未发生变化,Keggin阴离子与有机胺修饰的TiO_2载体通过Mn—N配位键结合,而不是单纯的吸附。很好的解决了非均相反应中,负载型多金属氧酸盐易脱落的问题。所以此类光催化剂耐水性好,不易溶脱,可重复使用。

Amine-functionalized mesoprous titanta materials impregnated with transiton-metal-monosubstituted polyoxometalate cluster,K5[Mn(H_2O)PW_(11)O_(39)](PW_(11)Mn),were prepared by coordination of nickel centers in the cluster with the amine surface groups in titanta supports. XRD,FT-IR,Elemental analysis were used to characterize the structure and composition of the composite.The exterimental results indicated that the photocataliytic activity of the composite was higher than that of the direct photolysis and the pure PW_(11)Mn in the homogeneous system. Moreover,this kind of chalyst was insoluble, and it could be reused.