化工进展2017，Vol.36Issue(12)：4679-4685,7.DOI:10.16085/j.issn.1000-6613.2017-0618
铀在FeCl3改性红壤上的吸附行为
Sorption behavior of U(Ⅵ) on FeCl3 modified Red Earth
摘要
Abstract
Sorption of U(Ⅵ) on inorganic modified Red Earth(IMRE) as a function of pH,ionic strength,humic acid,contact time and temperature was investigated under ambient conditions with spectrometer. The adsorption process was analyzed by thermodynamics and kinetics,and the natural Red Earth(NRE) and inorganic modified Red Earth(IMRE)sample was characterized by SEM, XRD and FTIR. The results showed that the IMRE has stronger adsorption capacity than NRE,and the adsorption of U(Ⅵ) on IMRE could be interpreted kinetically by a pseudo-second-order model. The pH and ionic strength of the solution has a great effect on the adsorption of uranium,the adsorption rate increases with the increase of pH at pH<8. With the increase of pH,the adsorption rate decreases gradually. It was found that the high ionic strength is not conducive to the adsorption of uranium. The presence of HA enhances the adsorption at lower pH,while reduces the adsorption at higher pH range. The adsorption of U(Ⅵ) onto IMRE could be described by Freundlich isothermal adsorption equation. The corresponding thermodynamic functions show that the adsorption of U(Ⅵ) on IMRE is spontaneous and endothermic.关键词
改性红壤/铀/吸附/动力学/热力学Key words
modified Red Earth(IMRE)/uranous/adsorption/kinetics/thermodynamics分类
化学化工引用本文复制引用
潘涛,于涛,梁诗敏,李红,侯瑞瑶..铀在FeCl3改性红壤上的吸附行为[J].化工进展,2017,36(12):4679-4685,7.基金项目
国家自然科学基金(21561001)及江西省自然科学基金(20161BAB203100)项目. （21561001）
