Journal
JOURNAL OF WATER PROCESS ENGINEERING
Volume 55, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.jwpe.2023.104074
Keywords
Layered double hydroxides; Polydopamine; Phosphate; U(VI); Adsorption
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Polydopamine-coated phosphate-intercalated Mg-Fe layered double hydroxides (PDA/phos-LDH) were fabricated for capturing U(VI). The introduction of phosphate and PDA significantly increased the removal amount for U(VI) due to increased functional groups. The highest removal amount of PDA/phos-LDH reached 912.0 mg/g within 60 min, and remained as high as 81.4% after 5 repeated uses.
Polydopamine-coated phosphate-intercalated Mg-Fe layered double hydroxides (PDA/phos-LDH) were fabricated to capture U(VI). Phosphate was intercalated in the layers of LDH because of its strong affinity for U(VI) species and the PDA was employed to provide massive binding sites for U(VI) by promoting the dispersion of LDH in the matrix. Experimental results revealed that the introduction of phosphate and PDA significantly increased the removal amount for U(VI) because of the increased functional groups (including PO43- , -OH, -NH2 and aromatic ring). The highest removal amount of PDA/phos-LDH (pH = 3.0, T = 298 K) reached 912.0 mg/g within 60 min, which was higher than many other LDH-based adsorption materials. After 5 repeated uses, the uptake percentage was still as high as 81.4 %. In addition, the excellent dynamic adsorption performance further confirmed the potential of PDA/phos-LDH in the actual processing of U(VI)-containing wastewater. Ion exchange, complexation, electrostatic attraction, cation-& pi; interaction and precipitation were confirmed to play prominent roles in U(VI) removal. In a word, PDA/phos-LDH was an exceptional adsorbent for U(VI) immobilization.
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