U(VI) sorption on illite: effect of pH, ionic strength, humic acid and temperature

被引：43
作者：
Gao, Yang [1 ]
Shao, Zhenyi [2 ]
Xiao, Zhihai [1 ]
机构：
[1] Univ South China, Sch Nucl Sci & Technol, Hengyang 421001, Peoples R China
[2] Chengdu Technol Univ, Dept Mech Engn, Chengdu 611730, Peoples R China
来源：
JOURNAL OF RADIOANALYTICAL AND NUCLEAR CHEMISTRY | 2015年 / 303卷 / 01期
基金：
中国国家自然科学基金;
关键词：
U(VI); Illite; Humic acid; Sorption; Desorption; MULTIWALLED CARBON NANOTUBES; GRAPHENE OXIDE NANOSHEETS; FULVIC-ACID; HUMIC/FULVIC ACID; AQUEOUS-SOLUTIONS; NA-RECTORITE; FOREIGN IONS; ADSORPTION; BATCH; LEAD;
D O I：
10.1007/s10967-014-3385-6
中图分类号：
O65 [分析化学];
学科分类号：
070302 ; 081704 ;
摘要：
In this work, the effect of various environmental factors on U(VI) sorption to illite was investigated,such as pH, ionic strength, humic acid (HA) and temperature. U(VI) sorption to illite strongly depended on pH values, ionic strength and temperature. At pH < 6.0, the presence of HA obviously improved U(VI) sorption on illite, because of the strong complexation between HA and U(VI) on illite surface. However, a slight inhibiting effect appeared at pH > 6.0. The thermodynamic parameters (Delta HA degrees, Delta SA degrees and Delta GA degrees) calculated from the temperature dependent sorption isotherms indicated that U(VI) sorption on illite was endothermic and spontaneous. Desorption investigation indicated that U(VI) sorption on illite was reversible in the absence of HA. However, in the presence of HA, U(VI) sorption on illite was irreversible due to the strong complexation between HA and U(VI). U(VI) sorption on illite was mainly dominated by ion-exchange and outer-sphere complexation. The results are very important for estimating the uptake and transfer of U(VI) in the natural environment.
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收藏
页码：867 / 876
页数：10
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