摘要
白庙子斜发沸石经化学改性为Ｎａ、ＮＨ４、Ｋ、Ｍｇ、Ｃａ型矿样，室温下与Ｐｂ２＋、Ｃｄ２＋静态离子交换．试验发现，Ｎａ、ＮＨ４、Ｋ型矿样对Ｐｂ２＋交换容量提高２０％，对Ｃｄ２＋提高３～８倍，Ｍｇ、Ｃａ型提高不显著．Ｐ２＋交换容量与配位阳离子价数直接相关，Ｃｄ２＋交换容量与配位阳离子价数、离子半径均有关．矿样对Ｐｂ２＋的分离选择性能优于Ｃｕ２＋、Ｃｄ２＋．
The clinoplilolite from sedimentary deposits found in Baimiaozi,Baoto,China were converted to the near-homoionic Na .NH4 .K .Mg .Ca forms by the chemical modifications. The modified zeolites exchanged with Ph2+ .Cd2+ in solutions at the ambient temprature. The results showed that CEC of Na-.NH4 .K-forms increased by 20% for Ph2= and 3～8 times for Cd2+,but that the CEC of Mg- .Ca- forms increased no significantly for Pb2+ .Cd2+. The CEC of the modified zeolites related closely to the valences of the coordinated canons for Ph2+,but to both valences and radius of the coordinated canons for Cd2+. The ion-exchanged isotherms showed that the selectivities for Pb2+ were more prior to Cu2+ .Cd2+ on the modified zeolites.
出处
《内蒙古大学学报（自然科学版）》
CAS
CSCD
1996年第5期654-658,共5页
Journal of Inner Mongolia University：Natural Science Edition
基金
国家自然科学基金
关键词
沸石
化学改性
离子交换
重金属离子
吸附性能
Baimiaozi clinoptilolite
chemical modification
lead and cadium ion exchange
