Environmental-friendly preparation of Ni–Co layered double hydroxide (LDH) hierarchical nanoarrays for efficient removing uranium (VI). (25th July 2021)

• Record Type: Journal Article
• Authors: Guo, Xiuling; Ruan, Yang; Diao, Zenghui; Shih, Kaimin; Su, Minhua; Song, Gang; Chen, Diyun; Wang, Shuao; Kong, Lingjun
• Is Part Of: Journal of cleaner production. Volume 308(2021)
• Publication Date: 2021-07-25
• Subjects: Ni–Co LDH -- Uranium -- Adsorption -- Wastewater; Factory and trade waste -- Management -- Periodicals; Manufactures -- Environmental aspects -- Periodicals; Déchets industriels -- Gestion -- Périodiques; Usines -- Aspect de l'environnement -- Périodiques; 628.5
• DOI: 10.1016/j.jclepro.2021.127384
• Languages: English
• ISSNs: 0959-6526

Abstract

Abstract: With the wide application of nuclear energy and the rapid development of mining, a great quantity of uranium (U(VI)) containing wastewater is inevitably generated. In this work, a facile environmental-friendly coprecipitation method was proposed for the green synthesis of binary layered double hydroxides (Ni–Co LDHW -7), which could be used to efficiently adsorb U(VI) from wastewater. Pseudo-second-order kinetic model and Dubinin-Radushkevich model fitted well with the adsorption of U(VI) on Ni–Co LDHW -7, the maximum adsorption capacity of U(VI) on Ni–Co LDHW -7 was 201.09 mg/g calculated by the Langmuir model. Adsorption equilibrium reached after 30 min, which is a spontaneous and endothermic process. Fourier Transform Infrared Spectrometer (FTIR) and X-ray Photoelectron Spectroscopy (XPS) measurements manifested that the favorable U(VI) extraction on Ni–Co LDHW -7 is mainly ascribed to inner-layer surface electrostatic interaction and complexation, which is dominated by abundant oxygen-containing M-OH and interlayer OH − ions. Briefly, this work provides a facial and environmental-friendly Ni–Co LDHW -7 for removing U(VI) in actual uranium-containing wastewater. Graphical abstract: Image 1 Highlights: A facile environmental-friendly coprecipitation method was proposed for green synthesis of Ni–Co LDHW -7. Adsorption capacity of uranium reached 201.09 mg/g calculated by Langmuir model at pH = 6 and 298 K. Metal hydroxyl group configuration and the hydroxyl groups contributed to U(VI) binding on Ni–Co LDHW -7. Ni–Co LDHW -7 showed good stability.