摘要：

The efficient adsorption and removal of U(VI) from nuclearwastewateris fetching growing interest due to its importance for the ecologicalenvironment and human health. In this study, we report a facile ionicself-assembly method to synthesize a phytic acid-based material denotedPE- x using phytic acid and ethylenediamine. PE- x was applied to remove U(VI) from a highly acidic aqueoussolution with pH = 1.0. In batch adsorption experiments, PE- x showed fast removal kinetics for U(VI) with an equilibriumtime around 10 min, excellent selectivity for An-Ln and U(VI) witha maximum selectivity of 97.8% and 76.2%, and a remarkable maximumadsorption capacity of 689.7 mg/g toward U(VI). Additionally, PE- x exhibited a considerable adsorption capacity of 282.6mg/g in the fixed bed column test. The adsorption mechanism was investigatedby using scanning electron microscopy (SEM), X-ray diffraction (XRD),Fourier-transform infrared spectroscopy (FTIR), and X-ray photoelectronspectroscopy (XPS). The results indicate a unique mechanism basedon the reconstruction of the self-assembly framework involving U(VI)building blocks driven by positively charged species exchange. Thisstudy provides new insights and strategies for the design of enhanceduranium adsorbents under highly acidic conditions and extends thepotential practical application of phytic acid for uranium capturefrom radioactive wastewater. Phytic acid-basedsupramolecular material can be used forhighly efficient removal of U(VI) from highly acidic aqueous media.

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