Sorption of Eu(III) at feldspar/water interface: effects of pH, organic matter, counter ions, and temperature
Author:
Li Ping1, Wu Hanyu12, Liang Jianjun1, Yin Zhuoxin2, Pan Duoqiang2, Fan Qiaohui1, Xu Di3, Wu Wangsuo2
Affiliation:
1. Key Laboratory of Petroleum Resources , Gansu Province/CAS Key Laboratory of Petroleum Resources Research , Institute of Geology and Geophysics, Chinese Academy of Sciences , Lanzhou 730000 , China 2. Radiochemistry Laboratory , School of Nuclear Science and Technology , Lanzhou University , Lanzhou 730000 , China 3. State Key Laboratory of Lake Science and Environment, Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences , Nanjing 210008 , China , Tel.: +86-931-4960831,
Abstract
Abstract
The sorption of Eu(III) on potassium feldspar (K-feldspar) was studied under various physicochemical conditions such as pH, temperature, counter ions and organic matter. The results showed that the sorption of Eu(III) on K-feldspar significantly increased with the increase of pH, and high Eu(III) concentration can inhibit such immobility to some extent. The presence of humic acid (HA) can increase the sorption of Eu(III) on K-feldspar in low pH range; while inhibit to a large extent under alkaline conditions. It is very interesting that at pH ~6.5, high ionic strength can promote the sorption of Eu(III) on K-feldspar in the presence of HA. In contrast, Eu(III) sorption was restricted obviously by NaCl in the absence of HA. The sorption procedure was involved with ion exchange and/or outer-sphere complexation as well as inner-sphere complexation. The presence of F− and PO4
3− dramatically enhanced Eu(III) sorption on K-feldspar, whereas both SO4
2− and CO3
2− had negative effects on Eu(III) sorption. X-ray photoelectron spectroscopy analysis indicated that Eu(III) tended to form hydrolysates at high initial concentration (3×10−4 mol/L) and high temperature (338 K).
Publisher
Walter de Gruyter GmbH
Subject
Physical and Theoretical Chemistry
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