Paper Details
Bibliographic Data:
| Code: |
LLMSG15 |
| Paper Type: |
Article |
| Author(s): |
Li P, Liu Z, Ma F, Shi Q, Guo Z, Wu W |
| Title: |
Effects of pH, ionic strength and humic acid on the sorption of neptunium(V) to Na-bentonite |
| Journal: |
Journal of Molecular Liquids, Amsterdam
Volume: 206 Year: 2015 Pages: 285-292
ISSN-Print: 0167-7322 |
| Internal Storage: |
V4040 |
| DOI: |
10.1016/j.molliq.2015.02.014 |
| Abstract: |
Effects of ionic strength, pH, temperature, humic acid (HA) and adsorbate concentration on Np(V) sorption to Na-bentonite were investigated in detail. The sorption of Np(V) to Na-bentonite was significantly dependent on pH and independent of temperature. In the presence of HA, Np(V) sorption was enhanced significantly at low pH; while an obvious negative effect was observed in higher pH range. Np(V) sorption followed the Freundlich isotherm indicating a heterogeneous sorption of Np(V) on the surface of Na-bentonite. The surface complexation model (SCM) suggests that sorption of Np(V) on Na-bentonite was mainly dominated by ion exchange at low pH values, and two dominant monodentate inner-sphere complexes of ≡ SiONpO20 (logK = − 4.55) and ≡ AlO(NpO2OH)− (logK = − 13.80) contributed to Np(V) sorption on Na-bentonite over high pH range.
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| Comment: |
SCM data; RAW_GRAPH |
Surface Area
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Site Density / Protolysis
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Complex Formation
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Formatted Citation
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