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        Polydopamine/β-cyclodextrin/coal fly ash composite for the highly efficient extraction of uranium from water environment

        Yan Wang,Yong Zhang,Xiaolin Liu,Sen Sun,Shiyi Qin,Jiaqi Huang,Bowei Chen 한국공업화학회 2023 Journal of Industrial and Engineering Chemistry Vol.127 No.-

        To obtain a green, low-cost and efficient adsorbent, polydopamine (PDA) and b-cyclodextrin (b-CD) wereadopted to modify coal fly ash (CFA) to prepare polydopamine/b-cyclodextrin/coal fly ash composite(PDA/b-CD/CFA). The successful introduction of PDA and b-CD was proved by FT-IR, XRD and XPS. Theuranium extraction efficiency on PDA/b-CD/CFA reached 95.6% (pH = 5.0, T = 298 K, C0 = 10 mg/L andm/V = 0.2 g/L) and the whole adsorption process was perfectly fitted by the Pseudo-second-order model(R2 = 0.999), illustrating that uranium was extracted via chemisorption. The correlation coefficient R2 ofLangmuir model was 0.999, which was higher than other models, meaning that uranium extractionbehavior on PDA/b-CD/CFA was uniform monolayer adsorption. The maximum extraction capacity of uraniumon PDA/b-CD/CFA calculated by Langmuir model was 537.6 mg/g, which was larger than most ofreported adsorbents, indicating that PDA/b-CD/CFA was a potential candidate for uranium extractionfrom water environment. Moreover, PDA/b-CD/CFA performed excellent uranium extraction propertieswith the existence of coexisting ions and the desorption efficiency of uranium by PDA/b-CD/CFA washigher to 95.8% at the fifth cycles, fully suggesting that PDA/b-CD/CFA possessed good selectivity andcycle stability. Characterization results demonstrated that uranium was immobilized on PDA/b-CD/CFAthrough chelation, complexing action, electrostatic interaction and hydrogen bonding.

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