MOF-implanted poly (acrylamide-co-acrylic acid)/chitosan organic hydrogel for uranium extraction from seawater. (15th February 2023)

• Record Type: Journal Article
• Authors: Song, Yucheng; Li, Hui; Shan, Tianhang; Yang, Peipei; Li, Songwei; Liu, Zhong; Liu, Chuntai; Shen, Changyu
• Is Part Of: Carbohydrate polymers. Volume 302(2023)
• Publication Date: 2023-02-15
• Subjects: Hydrogel -- Low swelling rate -- Uranium capture -- Seawater; Polysaccharides -- Periodicals; Polysaccharides -- Periodicals; Polysaccharides -- Périodiques; Electronic journals; 547.78
• DOI: 10.1016/j.carbpol.2022.120377
• Languages: English
• ISSNs: 0144-8617

Abstract

Abstract: In this study, a composite hydrogel with a low swelling ratio, excellent mechanical properties, and good U (VI) adsorption capacity was developed by incorporating a metal-organic framework (MOF) with a poly (acrylamide- co -acrylic acid)/chitosan (P(AM-co-AA)/CS) composite. The CS chain, which contains NH2, reduces the swelling ratio of the hydrogel to 4.17 after 5 h of immersion in water. The coordinate bond between the MOF and carboxyl group on the surface of P(AM-co-AA)/CS improves the mechanical properties and stability of P(AM-co-AA)/CS. The U(VI) adsorption capacity of P(AM-co-AA)/CS/MOF-808 is 159.56 mg g −1 at C0 = 99.47 mg L −1 and pH = 8.0. The adsorption process is well fitted by the Langmuir isotherm and pseudo-second-order model. The P(AM-co-AA)/CS/MOF-808 also exhibits good repeatability and stability after five adsorption–desorption cycles. The uranium adsorption capacity of the developed adsorbent after one month in natural seawater is 6.2 mg g −1, and the rate of uranium adsorption on the hydrogel is 0.21 mg g −1 day −1 . Graphical abstract: Unlabelled Image