کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
8863085 | 1620196 | 2018 | 41 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Sorption of Se species on mineral surfaces, part I: Batch sorption and multi-site modelling
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
علوم زمین و سیارات
ژئوشیمی و پترولوژی
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چکیده انگلیسی
The sorption behavior of Se(IV) on Grimsel granodiorite and its main minerals, plagioclase, K-feldspar, quartz and biotite, were investigated in Grimsel groundwater simulant in a large Se concentration range (from 1.66â¯Ãâ¯10â10â¯M to 1â¯Ãâ¯10â3â¯M). Experimental results show that the distribution coefficients (Kd values) of Se(IV) on the rock and mineral samples increased with the decreasing of Se(IV) concentration. The sorption of Se(IV) on biotite has the largest Kd value in low concentration area (<10â7â¯M) stabilizing between 0.0595â¯Â±â¯0.0097â¯m3/Kg and 0.0713â¯Â±â¯0.0164â¯m3/Kg. The Kd value of Se(IV) on K-feldspar was the second largest (0.0154â¯Â±â¯0.0019â¯m3/Kg in 10â9â¯M) while the sorption on quartz was negligible. The sorption behavior of Se(IV) on Grimsel granodiorite followed the same trend as plagioclase, the most abundant mineral in Grimsel granodiorite, with Kd values of 0.0078â¯Â±â¯0.0010â¯m3/Kg for Grimsel granodiorite and 0.0085â¯Â±â¯0.0016â¯m3/Kg for plagioclase, when Se(IV) concentration was 10â9 M. HPLC-ICP-MS results show that all the Se(IV) remained in +IV oxidation state after more than 1 month experimental time and speciation modelling proved that the main species in Grimsel groundwater simulant were HSeO3â and SeO32â. Multi-site surface complexation modelling was performed by PHREEQC with the help of molecular modelling techniques which was performed with the CASTEP code implemented into Materials Studio. The modelling results predict that there are three kinds of sorption sites on the surface of biotite mineral, with sorption site densities differing in three magnitudes.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Applied Geochemistry - Volume 95, August 2018, Pages 147-157
Journal: Applied Geochemistry - Volume 95, August 2018, Pages 147-157
نویسندگان
Xiaodong Li, Eini Puhakka, Jussi Ikonen, Mervi Söderlund, Antero Lindberg, Stellan Holgersson, Andrew Martin, Marja Siitari-Kauppi,