Journal
CHEMICAL ENGINEERING JOURNAL
Volume 424, Issue -, Pages -Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.cej.2021.130351
Keywords
Uranium (VI); Electrosorption; Polysaccharide binders; Co-ions expusion; Graphene
Categories
Funding
- National Natural Science Foundation of China [12005095]
- Projects of Education Department of Hunan Province, China [19C1628, 18A239]
- Doctoral Scientific Research Foundation of University of South China [200XQD021]
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The use of polysaccharide binders in asymmetrical RGH electrode configuration enhances the electrosorption performance for uranium removal, leading to faster kinetics and higher adsorption capacity compared to symmetrical PVDF-bound RGH configuration. This innovative design shows practical significance and economic benefits for electrosorption applications.
As an energy-saving and facile technology, the potential of capacitive deionization (CDI) starts to surface in enrichment and recovery of uranium (U(VI)) from aqueous solutions. However, co-ion expulsion effect and poor surface wettability of electrode materials limit the eletrosorption performance. Here, polysaccharides xanthan gum (XG)-and chitosan (CS)-bound porous reduced graphene (RGH) electrodes were rationally designed, and then assembled into asymmetrical electrode configuration for U(VI) eletrosorption. Owing to the introduction of polysaccharide binders, the oppositely charged groups on the surface of cathode and anode weaken the co-ions exclusion effect as well as endow their superior surface hydrophilicity and electroconductivity, which facilitates the electrosorption for U(VI). Meanwhile, the negatively charged carboxylate groups could act as extra micro electric fields to attract U(VI) cations, and form stronge complexation between them. As a consequence, asym-metrical polysaccharide-bound RGH configuration gave rise to a larger removal ratio of 97.9% within 4 h at 1.2 V, as well as 2.5 times faster kinetics than symmetrical PVDF-bound RGH electrode configuration. Moreover, the accumulated adsorption capacity in six adsorption-desorption cycles of the former is up to 1413.0 mg g(-1), 75% higher than the latter, which is of practical significance and economic benefit for electrosorption application.
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