Ca/Mg bimetallic MOFs modified with amidoximerized polyacrylonitrile and high efficiency uranium(VI) extraction from solution

• Published in: Journal of solid state chemistry 2024-10, Vol.338, p.124894, Article 124894
• Main Authors: Diao, Shilin, Li, Mengfang, Liu, Xuan, Liu, Yujia, Shang, Qingjin, Xu, Yewei
• Format: Article
• Language: English
• Subjects: Adsorption; Ca/mg-MOF/PAO; Mechanism; Uranium(VI)
• ISSN: 0022-4596; 1095-726X
• DOI: 10.1016/j.jssc.2024.124894

A hybrid material, Ca/Mg-MOF/polyamidoxime (Ca/Mg-MOF/PAO), was synthesized and tested for uranium(VI) uptake in solution. The structure and performance of Ca/Mg-MOF/PAO were comprehensively investigated. Adsorption experiments demonstrated that Ca/Mg-MOF/PAO exhibited an extraordinary saturation capacity of 579.5 mg/g for uranium (VI) at pH = 8, surpassing that of most other adsorbents. The adsorption process of Ca/Mg-MOF/PAO on uranium (VI) conformed to Langmuir and PSO models, suggesting chemical rate control and monolayer adsorption, respectively. Furthermore, Ca/Mg-MOF/PAO displayed excellent adsorption-desorption recovery performance for uranium (VI). Its high adsorption capacity and efficient recoverability position Ca/Mg-MOF/PAO as a material with great potential for extracting uranium (VI) from aqueous media. The Ca/Mg-MOF/PAO was synthesized by the integration of polyamide oxime (PAO) into the Ca/Mg-MOF framework. Adsorption experiments demonstrated that Ca/Mg-MOF/PAO exhibited an extraordinary saturation capacity of 579.5 mg/g for uranium(VI) at pH = 8. The main mechanism involves not only the complexing reaction between uranium(VI) and Ca/Mg-OH but also more chelating effect between uranium(VI) and amidoxime groups. [Display omitted] •Ca/Mg-MOF/PAO was synthesized by a facile method.•Ca/Mg-MOF/PAO shows high efficiency uranium (VI) adsorption performance.•The uranium (VI) removal mechanism of Ca/Mg-MOF/PAO was studied.