稀土光化学Tb~3在KlO_4-KOH体系中的光氧化

本文报道在KIO_4-KOH碱性溶液中Tb~(3+)生成可溶性络合物的光氧化.研究了碱度,络合剂浓度,Tb~(3+)浓度,辐照面积,光强和辐照时间等因素对了b~(4+)生成的影响.KOH浓度应大于0.3M,KIO_4的浓度应比Tb~(3+)的初始浓度大两个数量级.生成的Tb~(3+)可溶性络离子呈棕红色.最大吸收峰420nm附近,比较稳定.

THE PHOTOCHEMISTRY OF RARE EARTHS PHOTOOXIDATION OF Tb~(3+) IN KIO_4-KOH MEDIUM

The photooxidation of Tb~(3+) in KIO_4-KOH solution is reported in this paper.The soluble complex formed in this system was irradiated by high pressure mercury lamp (366nm). The influences of the concentration of KIO_4,KOH and Tb~(3+),the time and area of exposure and the light intensity on the amount of Tb~(4+) formed were investigated. The preferable concentration of KOH is>0.3M,and that of KIO_4 is two orders higher than the initial concentration of Tb~(3+). The soluble complex ion of Tb~(4+) formed is red-brown and fairly stable. The maximum of its absorption band is at about 420nm.