Innovative calcium-doped layered yttrium hydroxides for rapid and efficient removal of fluoride from aqueous solutions: Insight into adsorption mechanism. Issue 1 (February 2023)

• Record Type: Journal Article
• Authors: Liang, Ying; Chen, Fengjie; Zhang, Meng; Chen, Lufeng; Xia, Yu; Zhou, Zhen; Chen, Bolei; Zhao, Lixia; Liang, Yong; Wang, Yawei
• Is Part Of: Journal of environmental chemical engineering. Volume 11:Issue 1(2023)
• Publication Date: 2023-02
• Subjects: Fluoride contamination -- Ca-Y LRHs -- Rapid and efficient removal -- Adsorption -- Electrostatic and ion exchange interactions; Chemical engineering -- Environmental aspects -- Periodicals; Environmental engineering -- Periodicals; Chemical engineering -- Environmental aspects; Environmental engineering; Periodicals; 660.0286
• DOI: 10.1016/j.jece.2022.109156
• Languages: English
• ISSNs: 2213-2929

Abstract

Abstract: Fluoride contamination is an important problem for sustainable human development and has to be addressed by environmental governance. However, the rapid and efficient removal of fluoride from aqueous solutions has always been challenging. In this study, several calcium-doped layered yttrium hydroxides (Ca-Y LRHs) were synthesized and used to remove fluoride. Relative to other adsorbents, 6% Ca-Y LRHs exhibits excellent performance of adsorption equilibrium time and maximum monolayer adsorption capacity with 4 min and 125.54 mg/g, respectively, determined by the adsorption kinetics and Langmuir model. The remarkable removal ability is probably attributed to the high fraction of nitrate anions in the interlayer space, which instead of hydroxyl groups or OH -, can be replaced by fluoride, inhibiting the rise of pH in solution. The ions adsorption and detection analysis indicated electrostatic and ion exchange interactions are involved in the defluorination process, and oxygenated groups in interlayer spaces were the main ligands to be replaced by fluoride. Studies on potential applications were successfully conducted on wastewater of an electrochemical fluorination process and surface water, demonstrating the ability of 6% Ca-Y LRHs to remove fluoride from these environments. These findings could provide an alternative strategy for the rapid and efficient treatment of fluoride contamination. Graphical Abstract: ga1 Highlights: 6% Ca-Y LRHs exhibits superb ability on adsorption equilibrium time and capacity. Ca doped LYHs resulted more nitrate in the interlayer. Electrostatic and ion exchange interactions are involved in the F - removal process. Oxygenated groups in interlayer spaces were the main ligands to be replaced by F - . 6% Ca-Y LRHs has ability to remove F - in a real aquatic environment.