Fluoride and Arsenite Removal by Adsorption on La2O3-CeO2/Laterite. (21st July 2021)

• Record Type: Journal Article
• Authors: Lim, Duong Thi; Tuyen, Trinh Ngoc; Nhiem, Dao Ngoc; Duc, Dao Hong; Chuc, Pham Ngoc; Bac, Nguyen Quang; Tung, Dang Xuan; Pham, Ngo Nghia; Ha, Luu Thi Viet; Tu, Nguyen Thi Thanh; Nguyen, Vo Thang; Khieu, Dinh Quang
• Other Names: Yi Dong kee Academic Editor.
• Is Part Of: Journal of nanomaterials. Volume 2021(2021)
• Publication Date: 2021-07-21
• Subjects: Nanostructured materials -- Periodicals; Nanotechnology -- Periodicals; Nanomatériaux; Nanostructured materials; Nanotechnology; Nanostructures; Nanotechnology; Periodicals; Fulltext; Internet Resources; Periodicals; 620.115
• DOI: 10.1155/2021/9991050
• Languages: English
• ISSNs: 1687-4110

Abstract

Abstract : In the present article, the adsorbent prepared from laterite with lanthanum and cerium oxides (La2 O3 -CeO2 /laterite (LCL)) was efficiently employed for the removal of arsenite and fluoride from an aqueous environment. The obtained materials were characterized by XRD, SEM, and nitrogen adsorption/desorption. The synthesized LCL exhibited a high adsorption capacity towards arsenite (As(III)) and fluoride. The adsorption of both analytes on LCL, which was well-fitted to a pseudo -second-order equation, was found to be kinetically fast in the first 20 minutes and reached equilibrium at around 180 minutes. Weber's intraparticle diffusion model in multilinearity using the piecewise linear regression combined with Akaike's criteria was addressed. The adsorption capacities of LCL calculated from Langmuir's isotherm model were found to be 67.08 mg·g -1 for arsenite and 58.02 mg·g -1 for fluoride. Thermodynamic parameters presented an endothermic nature of arsenite adsorption but an exothermic nature for fluoride and a negative Gibbs free energy for the spontaneous process of arsenite or fluoride adsorption at the studied temperature range. The excellent adsorption performance and stability make the composite of laterite and La-Ce binary oxides an alternative efficient and cheap adsorbent for the removal of arsenite and fluoride in an aqueous solution.