Eu(III) uptake on rectorite in the presence of humic acid: A macroscopic and spectroscopic study

详细信息    查看全文

• 作者：Changlun Chen ; ^{clchen@ipp.ac.cn} ; Xin Yang ; Juan Wei ; Xiaoli Tan ; Xiangke Wang ; ^{xkwang@ipp.ac.cn}
• 关键词：Eu(III) ; Humic acid ; Rectorite ; Modelling ; EXAFS
• 刊名：Journal of Colloid and Interface Science
• 出版年：2013
• 出版时间：1 March, 2013
• 年：2013
• 卷：393
• 期：Complete
• 页码：249-256
• 全文大小：837 K

文摘

This work contributed to the comprehension of humic acid (HA) effect on Eu(III) uptake to Na-rectorite by batch sorption experiments, model fitting, scanning electron microscopy, powder X-ray diffraction, Fourier transform infrared spectroscopy, X-ray photoelectron spectroscopy, and extended X-ray absorption fine structure (EXAFS) spectroscopy. At low pH, the presence of HA enhanced Eu(III) sorption on Na-rectorite, while reduced Eu(III) sorption at high pH. The experimental data of Eu(III) sorption in the absence and presence of HA were simulated by the diffuse-layer model well with the aid of FITEQL 3.2 software. The basal spacing of rectorite became large after Eu(III) and HA sorption on Na-rectorite. Some of Eu(III) ions and HA might be intercalated into the interlayer space of Na-rectorite. EXAFS analysis showed that the R_EuO (the bond distance of Eu and O in the first shell of Eu) and N values (coordination number) of Eu(III)-HA-rectorite system were smaller than those of Eu(III)-rectorite system.