Journal
CHEMICAL ENGINEERING JOURNAL
Volume 359, Issue -, Pages 1563-1572Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.cej.2018.11.016
Keywords
PVP/MoS2; Adsorption; Intercalation; DFT calculations
Categories
Funding
- Science Challenge Project [TZ2016004]
- National Key Research and Development Program of China [2017YFA0207002]
- NSFC [21607042, 21707033, 21577032, 21777039]
- Fundamental Research Funds for the Central Universities [JB2017193, 2017MS045, 2017YQ001, 2018ZD11]
- NCEPU Double First-Class Graduate Talent Cultivation Program [035/XM1805316]
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In this study, polyvinyl pyrrolidine intercalated molybdenum disulfide (PVP/MoS2) with well-interconnected nanosheets were successfully prepared by an effective and versatile one-step hydrothermal strategy. The structural characterization indicated that the PVP molecules were intercalated into MoS2 to produce widened interlayer spacing. The obtained PVP/MoS2 nanomaterials exhibited impressive adsorption performance. Specifically, the maximum adsorption capacity of U(VI) on PVP/MoS2 (similar to 117.9 mg/g) was apparently superior than that of pristine MoS2 (similar to 23.7 mg/g) at 298 K and pH= 4.5, which might be related to the enlarged specific surface area and extensive functional groups of PVP/MoS2. The kinetics investigation showed that the uptake of U(VI) with PVP/MoS2 was ultrafast and the adsorption equilibrium could be reached within 10 min. The enrichment of U(VI) on PVP/MoS2 was caused by the existence of UO2-S covalent bonds and surface complexation with PVP, which was jointly verified by systematic investigation of FT-IR, XPS and DFT calculations. These findings were intriguing for both evaluating the adsorption performance of PVP/MoS2 and advancing other polymer interacted layered metal sulfides potential applications in the field of radioactive water treatment.
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