Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
6664144 | Journal of Environmental Chemical Engineering | 2018 | 7 Pages |
Abstract
Herein, Eu(III) retention mechanism and microstructure on δ-MnO2 as a function of solution pH were studied using both the conditional macroscopic method and molecular-level high resolution EXAFS technique with a bent crystal analyzer. The results suggested that the sorption Eu(III) onto δ-MnO2 was strongly dependent on pH but not on ionic strength, implying the formation of inner-sphere surface complexation for Eu(III) on δ-MnO2 surface. Molecular-level results from EXAFS methods showed that Eu was surrounded by â¼8O atoms in first coordination shell at REu-Oâ¯ââ¯2.42â¯Ã
, and second shell of Mn atoms at REu-Mnâ¯ââ¯3.91â¯Ã
was found in four sorption samples from different solution pH. All this results reflected the formation of a bidentate surface complex with Eu(III) bonding by corner sharing to MnO6-octahedron on δ-MnO2 surface. Both the macroscopic findings and microstructure of Eu(III) at the δ-MnO2-water interface enhance our understanding for the reaction dynamics and states of Eu(III) and related radionuclides in natural environment.
Related Topics
Physical Sciences and Engineering
Chemical Engineering
Chemical Engineering (General)
Authors
Lijia Dong, Qing Liao, Wensheng Linghu, Yuying Huang, Runpu Shen, Ahmed Alsaedi, Jin Wang, Tasawar Hayat, Guodong Sheng,