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

Tiến sĩNguyễn Thị Thanh TúDuong Thi LimTrinh Ngoc TuyenDao Ngoc NhiemDao Hong DucPham Ngoc ChucNguyen Quang BacDang Xuan TungNgo Nghia PhamLuu Thi Viet HaVo Thang NguyenDinh Quang Khieu

Khoa Công Nghệ

Thể loại: Bài báo

Sơ lược nội dung

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.

Thông tin chung
Thể loại
Bài báo
Năm xuất bản
Ngôn ngữ gốc
Tiếng Anh
Tạp chí công bố
Journal of Nanomaterials
Loại tạp chí
Danh mục ISI/Scopus
1687-4110 / 1687-4129
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