Controlled preparation of cerium oxide loaded slag-based geopolymer microspheres (CeO2@SGMs) for the adsorptive removal and solidification of F- from acidic waste-water

Kaituo Wang; Huiye Lei; Yaseen Muhammad; Fan Chen; Feng Gao; Yuezhou Wei; Toyohisa Fujita

doi:10.1016/j.jhazmat.2020.123199

Controlled preparation of cerium oxide loaded slag-based geopolymer microspheres (CeO₂@SGMs) for the adsorptive removal and solidification of F^- from acidic waste-water

J Hazard Mater. 2020 Dec 5:400:123199. doi: 10.1016/j.jhazmat.2020.123199. Epub 2020 Jun 12.

Authors

Kaituo Wang¹, Huiye Lei², Yaseen Muhammad³, Fan Chen², Feng Gao², Yuezhou Wei², Toyohisa Fujita²

Affiliations

¹ Guangxi Key Laboratory of Petrochemical Resource Processing and Process Intensification Technology, School of Chemistry and Chemical Engineering, Guangxi University, Nanning, 530004, China; School of Resources, Environment and Materials, Guangxi University, Guangxi Nanning, 530004, China. Electronic address: wangkaituo@gxu.edu.cn.
² School of Resources, Environment and Materials, Guangxi University, Guangxi Nanning, 530004, China.
³ Guangxi Key Laboratory of Petrochemical Resource Processing and Process Intensification Technology, School of Chemistry and Chemical Engineering, Guangxi University, Nanning, 530004, China; Institute of Chemical Sciences, University of Peshawar, 25120, KP, Pakistan.

PMID: 32947739
DOI: 10.1016/j.jhazmat.2020.123199

Abstract

A new cerium oxide loaded slag-based geopolymer microspheres (CeO₂@SGMs) was prepared by a two-step i.e. dispersion-suspension-solidification and in-situ co-precipitation method. The optimal parameters for the preparation of 0.02CeO₂@SGMs were slag (30 g), 1.7 M water glass (12.86 g), water (8 g) and 0.02 mol/L of Ce⁴⁺. 0.02CeO₂@SGMs was characterized by SEM, XRD, BET, EDX, FTIR, XPS and PSD techniques. The leaching concentration of Ca²⁺ (95.65 mg/L) was only 1/5 of the SGMs at pH 2 after the modification of CeO₂. Adsorption data fitted well with Freundlich isotherm model suggesting multilayer adsorption mechanism with a maximum adsorption capacity for F^- by 0.02CeO₂@SGMs of 121.77 mg/g at 298 K. The negative values of thermodynamic parameters (ΔH⁰ and ΔS⁰) indicated the exothermic nature of the adsorption process with reduced chaos of the whole system. 0.02CeO₂@SGMs exhibited excellent dynamic adsorption performance at 4 mL/min F^- solution flow rate. The influence of various co-existing anions on adsorption of F^- over 0.02CeO₂@SGMs followed an order of: Cl^- ≈ NO₃^- < SO₄^2- << PO₄^3-. Attributed to the facile preparation process, cost-effectiveness and environmental friendliness, the newly designed 0.02CeO₂@SGMs can be deemed of promising industrial applications for the abatement of F^- from wastewater.

Keywords: CeO(2)loaded slag-based geopolymer microsphere; Counter anion; F(−) adsorption; In-Situ co-precipitation; Kinetic isotherm model.

Publication types

Research Support, Non-U.S. Gov't