کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
6664144 | 1427043 | 2018 | 7 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Application of EXAFS with a bent crystal analyzer to study the pH-dependent microstructure of Eu(III) onto birnessite
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی شیمی
مهندسی شیمی (عمومی)
پیش نمایش صفحه اول مقاله
![عکس صفحه اول مقاله: Application of EXAFS with a bent crystal analyzer to study the pH-dependent microstructure of Eu(III) onto birnessite Application of EXAFS with a bent crystal analyzer to study the pH-dependent microstructure of Eu(III) onto birnessite](/preview/png/6664144.png)
چکیده انگلیسی
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.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Environmental Chemical Engineering - Volume 6, Issue 1, February 2018, Pages 842-848
Journal: Journal of Environmental Chemical Engineering - Volume 6, Issue 1, February 2018, Pages 842-848
نویسندگان
Lijia Dong, Qing Liao, Wensheng Linghu, Yuying Huang, Runpu Shen, Ahmed Alsaedi, Jin Wang, Tasawar Hayat, Guodong Sheng,