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Sorption of Eu(Ⅲ) on GMZ bentonite in the absence/presence of humic acid studied by batch and XAFS techniques

Science China Chemistry 2010年第6期53卷 1420-1428页

作者： hu jun1,2,xie zhi3,he bo3,sheng guodong1,chen changlun1,li jiaxing1,chen yixue2 & wang xiangke1 1key laboratory of novel thin film solar cells Institute of Plasma Physics,Chinese Academy of Sciences,hefei 230031,China 2School of Nuclear Science and Engineering,North China Electric Power University,Beijing 102206,China 3National Synchrotron Radiation laboratory,University of Science & Technology of China,hefei 230029,China key laboratory of novel thin film solar cells Institute of Plasma Physics Chinese Academy of Sciences Hefei China School of Nuclear Science and Engineering North China Electric Power University Beijing China National Synchrotron Radiation laboratory University of Science & Technology of China Hefei China

Bentonite has been extensively studied because of its strong sorption ability and low *** this work,the Na-bentonite from Gaomiaozi County (China) has been characterized by XRD,FTIR and acid-base *** sorption of Eu(III) on Na-bentonite in the absence/presence of humic acid (HA) was studied at T = 25 ± 2 °C and in 0.01 mol/L NaClO4 *** effects of pH,HA,contact time and initial Eu(III) concentrations were also *** results indicate that the sorption of Eu(III) on Na-bentonite was dependent on pH *** presence of HA had little effect on Eu(III) sorption at low pH values,but decreased Eu(III) sorption at high pH values.X-ray absorption fine structure spectroscopy (XAFS) was applied to characterize the local structural environment of the adsorbed Eu(III) on bare Na-bentonite and HA-bentonite *** re- sults indicate that Eu(III) was bound to O atoms at a distance of about 2.39  at pH *** results are crucial for the evalua- tion of the sorption and migration of other trivalent lanthanides and actinides in bentonite as backfill materials.

关键词： Na-bentonite Eu(III) sorption humic acid XAFS

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