Effect of pH, ionic strength, foreign ions and humic substances on Th(IV) sorption to GMZ bentonite studied by batch experiments

被引：0
作者：
Yunhui Dong
Zhengjie Liu
Yueyun Li
机构：
[1] Northeast University,School of Material Science and Metallurgical Engineering
[2] Shandong University of Technology,School of Chemical Engineering
来源：
Journal of Radioanalytical and Nuclear Chemistry | 2011年 / 289卷
关键词：
GMZ bentonite; Th(IV); Sorption; pH; Ionic strength;
D O I：
暂无
中图分类号：
学科分类号：
摘要：
Bentonite has been studied extensively because of its strong sorption and complexation ability. Herein, GMZ bentonite from Gaomiaozi county (Inner Mongolia, China) was investigated as the candidate of backfill material for the removal of Th(IV) ions from aqueous solutions. The results indicate that the sorption of Th(IV) is strongly dependent on pH and ionic strength at pH < 5, and independent of ionic strength at pH > 5. Outer-sphere surface complexation or ion-exchange are the main mechanism of Th(IV) sorption on GMZ bentonite at low pH values, whereas the sorption of Th(IV) at pH > 5 is mainly dominated by inner-sphere surface complexation or surface precipitation. Soil fulvic acid (FA) and humic acid (HA) have a positive influence on the sorption of Th(IV) on bentonite at pH < 5. The different addition sequences of HA and Th(IV) to GMZ bentonite suspensions have no obvious effect on Th(IV) sorption to HA-bentonite hybrids. The high sorption capacity of Th(IV) on GMZ bentonite suggests that the GMZ bentonite can remove Th(IV) ions from large volumes of aqueous solutions in real work.
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页码：257 / 265
页数：8
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