Fluoride and Arsenite Removal by Adsorption on La2O3-CeO2/Laterite

Author:

Lim Duong Thi1,Tuyen Trinh Ngoc1,Nhiem Dao Ngoc23ORCID,Duc Dao Hong3,Chuc Pham Ngoc2,Bac Nguyen Quang23,Tung Dang Xuan4,Pham Ngo Nghia5,Ha Luu Thi Viet6,Tu Nguyen Thi Thanh7,Nguyen Vo Thang8,Khieu Dinh Quang9ORCID

Affiliation:

1. Institute of Geography, VAST, 10000, Vietnam

2. Institute of Material Science, VAST, 10000, Vietnam

3. Graduate University of Science and Technology, VAST, 10000, Vietnam

4. Institute of Geological Science, VAST, 10000, Vietnam

5. VNU University of Science, 10000, Vietnam

6. Industrial University of Ho Chi Minh City, 70000, Vietnam

7. Van Lang University, 70000, Vietnam

8. University of Education and Science, The University of Danang, 50000, Vietnam

9. University of Sciences, Hue University, 53000, Vietnam

Abstract

In the present article, the adsorbent prepared from laterite with lanthanum and cerium oxides (La2O3-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.

Funder

Vietnam Academy of Science and Technology

Publisher

Hindawi Limited

Subject

General Materials Science

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