The perovskite(ABO 3) type oxides have a photocatalytic activity that can be characterized with decolorization of some organic dyes under irradiation of mercury lamp. The experimental results show that the photocatalytic activity of ABO 3 increases with increasing atomic number of atom B(Ti—Co) when A site atom keeps constant. It is connected with the rise of Allred Rochow electronegativity of atom B, the decrease of ABO 3 energy gap(energy defference between the filled p bands of O 2- and the unoccupied 3 d band of neighboring atom B) and the increase of the third atomic ionizaton potentials of atom B. It has been also proved that the photocatalytic activity of ABO 3 compounds increases with increasing χ AR of atom A(Ca, Cd, Pb).
LaFeO 3 nanocrystals were synthesized by both citric acid and microemulsion methods. Their structures, sizes and morphologies were investigated by XRD and TEM. All the LaFeO 3 obtained showed catalytic activity in decolorization of some organic dyes under irradiation of mercury lamp.
用柠檬酸法合成了钙钛矿型复合氧化物 La Fe O3,并按不同比例进行掺杂 ,制备了L a1-x Srx Fe O3( x=0 .0 1、0 .0 2、0 .0 3、0 .0 4、0 .0 5) .以荧光汞灯为光源测定了样品对不同染料的光催化降解活性 ,根据红外、紫外、光声光谱等技术对催化剂的分析结果 ,讨论了光催化性能及掺杂Sr2 +对其活性的影响 ,结果表明 ,掺杂后 L a Fe
The Bi 2O 3 was prepared from Bi(NO 3) 3·5H 2O, followed by calcination of its alkali salt. The Bi 2O 3 was used as photocatalyst in photocatalytic decoloration of dyes. The results showed that the Bi 2O 3 exhibited a better photocatalytic activity under illumination of sunlight than that illuminated by Hg lamp.
