کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
4989970 | 1456945 | 2017 | 34 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
The adsorption of U(VI) on carbonaceous nanofibers: A combined batch, EXAFS and modeling techniques
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی شیمی
تصفیه و جداسازی
پیش نمایش صفحه اول مقاله
![عکس صفحه اول مقاله: The adsorption of U(VI) on carbonaceous nanofibers: A combined batch, EXAFS and modeling techniques The adsorption of U(VI) on carbonaceous nanofibers: A combined batch, EXAFS and modeling techniques](/preview/png/4989970.png)
چکیده انگلیسی
The adsorption mechanism between U(VI) and carbonaceous nanofibers (CNFs) was demonstrated by batch, EXAFS and surface complexation modeling. The batch experiments indicated that the adsorption of U(VI) on CNFs decreased with increasing ionic strength at pHÂ <Â 4.0, whereas the U(VI) adsorption was independent of ionic strength at pH 4.0-7.0. The adsorption kinetics and isotherms of U(VI) adsorption can be satisfactorily fitted by pseudo-second-order kinetic model and Langmuir model, respectively. The maximum adsorption capacity of CNFs for U(VI) calculated from Langmuir model at pH 4.5 and 293Â K was 52.63Â mg/g. The results of EXAFS analysis revealed that the adsorption mechanism of U(VI) on the CNFs at pH 4.0 was outer-sphere surface complexation, whereas inner-sphere surface complexation/surface co-precipitate dominated the adsorption mechanism of U(VI) on the CNFs at pH 7.0. The adsorption of U(VI) on CNFs can be fitted by double diffuse layer modeling with an outer-sphere surface complexes (SOHUO22+ species) and an inner-sphere surface complexes (SOUO2+ species) very well. The findings presented herein showed that CNFs can be regarded as a promising candidate for the preconcentration and immobilization of radionuclides from aqueous solutions in environmental remediation.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Separation and Purification Technology - Volume 175, 24 March 2017, Pages 140-146
Journal: Separation and Purification Technology - Volume 175, 24 March 2017, Pages 140-146
نویسندگان
Baowei Hu, Qingyuan Hu, Di Xu, Chengguang Chen,