Journal
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
Volume 631, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.colsurfa.2021.127747
Keywords
Uranium adsorption; Poly(amic-acid); Single-walled carbon nanohorns; Quantum chemical calculation
Categories
Funding
- National Natural Science Foundation of China [21808031]
- Foundation of Stat Key Laboratory of Nuclear Resources and Environment [NRE1411]
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Poly(amic-acid) modified single-walled carbon nanohorns (PAA/SWCNH-COOH) with dual-functional groups exhibited significantly increased adsorption capacity for uranium (VI), with potential for repeated use. Quantum chemical calculations revealed strong interactions between amide and carboxyl groups with uranium ions, ensuring high adsorption capacity of the material.
Poly(amic-acid) modified single-walled carbon nanohorns (PAA/SWCNH-COOH) contained dual-functional groups (amide and carboxyl) were synthesized by in-situ polymerization and used for the elimination of ura-nium (VI). It was found that the adsorption capacity of SWCNH-COOH increased significantly after grafting PAA chains, and the theoretical monolayer adsorption capacity of PAA/SWCNH-COOH could reach 216.0 mg/g. The adsorption capacity of this material could remain up to 90% of the initial value after 5 times of reuse. Moreover, PAA/SWCNH-COOH has an excellent adsorption selectivity, which could be attributed to the synergistic adsorption effects between amide and carboxyl groups. To further study the interaction mechanism between uranium ions and the adsorbents, the quantum chemical calculations were performed using DFT method. The simulation results show that both amide and carboxyl groups have a strong interaction with uranium ions, which ensures the high adsorption capacity of this material. This research proved that the PAA/SWCNH-COOH is a promising adsorption material for removing uranium from wastewater and it also sheds a light on the interaction mechanism between bifunctional adsorbents and uranium ions.
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