k-氧化铝自酸性水溶液中对铈(Ⅳ)离子及其配合物的吸附  

Adsorption of Ce(Ⅳ) Ion and Its Complexes on Alumina from Acid Aqueous Solution

作　　者：杨中民[1] 周家云[1] 王月平[1] 杨春芬[1] 

机构地区：[1]云南大学化学系,昆明650091

出　　处：《云南大学学报（自然科学版）》1998年第S3期383-385,共3页Journal of Yunnan University(Natural Sciences Edition)

摘　　要：研究了ｋ－Ａｌ２Ｏ３自酸性水溶液中对Ｃｅ（Ⅳ）离子及其配合物的吸附．测定了吸附速度曲线及温度、 溶液ｐＨ值、配体和表面活性剂对吸附的影响；由实验结果计算了吸附过程的△Ｈ，△Ｇ和△Ｓ．结果表明：极少量 ＮＯ３， ＯＸ， Ｐ２Ｏ４－７， Ｇｌｕ， Ａｌａ等配体和阴离子表面活性剂ＳＤＳ可大幅度增加 Ｃｅ（Ⅳ）的吸附量．提出吸附机理除了 离子交换和静电吸附外，还可能发生配位吸附．The rate cunves and isothrms for the adsorption of Ce(IV) ion and its hydrolyzed spedes from acid aqueous solution on k-Al2O3 have been measured at several temperatures (20, 30, 40 and 45℃). The effects of solution PH, ligands and surfactants on adsorption were studied. The results show: (1) Freundlich isotherm is obeyed, and △H, △G and △S of adsorption process were culculated; (2) The addition of a few of ligants (NO3 Glu and Ala) increases greatly the adsorption amount of ac(IV) ion and its hydrdlyzed species, and cationic and anionic surfactants have different effects on the adsorption. It is suggested that the coordination adsorptions have occured besides the mechanisms of ion-exchange and ion-pair adsorption at the oxide/water interface.

关 键 词：k-氧化铝 铈(Ⅳ) 配位吸附 

分 类 号：O647.3[理学—物理化学]