Enhancing U(VI) adsorptive removal via amidoximed polyacrylonitrile nanofibers with hierarchical porous structure

In this study, hierarchical porous polyacrylonitrile nanofibers were fabricated via electrospinning zeolitic imidazolate framework-8 (ZIF-8) and polyacrylonitrile (PAN), followed by tannic acid (TA) etching and amidoximation (denoted as p-PAN-AO). The as-prepared p-PAN-AO was utilized to remove radi...

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Bibliographic Details
Published in:Colloid and polymer science 2021, Vol.299 (1), p.25-35
Main Authors: Zhang, Zhijie, Chu, Nini, Shen, Yinglin, Li, Congling, Liu, Rui
Format: Article
Language:English
Subjects:
Adsorption
Adsorptivity
Characterization and Evaluation of Materials
Chemistry
Chemistry and Materials Science
Complex Fluids and Microfluidics
Endothermic reactions
Environmental cleanup
Food Science
Metal-organic frameworks
Nanofibers
Nanotechnology and Microengineering
Original Contribution
Physical Chemistry
Polyacrylonitrile
Polymer Sciences
Seawater
Soft and Granular Matter
Structural hierarchy
Tannic acid
Uranium
Wastewater
Zeolites
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Summary:In this study, hierarchical porous polyacrylonitrile nanofibers were fabricated via electrospinning zeolitic imidazolate framework-8 (ZIF-8) and polyacrylonitrile (PAN), followed by tannic acid (TA) etching and amidoximation (denoted as p-PAN-AO). The as-prepared p-PAN-AO was utilized to remove radioactive U(VI) from sewage water and simulated seawater. The influence of uranium adsorption on p-PAN-AO was investigated as a function of uranium concentration, pH, and time. Adsorption kinetic experiments indicated that the pseudo-second-order kinetic model was fitted better than the pseudo-first-order model. Benefiting from amidoximation and hierarchical porous structure, the nanoadsorbent exhibited a high U(VI) adsorption capacity of 412.28 mg/g at 298 K. The thermodynamic analysis manifested a spontaneous and endothermic nature of U(VI) adsorption. The results demonstrated a potential application of the reported materials in nuclear wastewater and environmental cleanup.
ISSN:0303-402X
1435-1536
DOI:10.1007/s00396-020-04764-8