Bimetallic Fe/Ni nanoparticles derived from green synthesis for the removal of arsenic (V) in mine wastewater

• Published in: Journal of environmental management Vol. 301; p. 113838
• Main Authors: Lin, Yuanqiong, Jin, Xiaoying, Khan, Nasreen Islam, Owens, Gary, Chen, Zuliang
• Format: Journal Article
• Language: English
• Published: Elsevier Ltd 01-01-2022
• Subjects: As (Ⅴ); C–Fe/Ni NPs; Green synthesis; Nanoparticles; Removal; Nanoparticles; Removal; C–Fe/Ni NPs; Green synthesis; As (Ⅴ)
• ISSN: 0301-4797; 1095-8630
• DOI: 10.1016/j.jenvman.2021.113838

Since the incidences of arsenicosis have significantly increased worldwide in the last decade, remediation of arsenic (As) pollution is now imperative. In this study, calcined green synthesized Fe/Ni nanoparticles (C–Fe/Ni NPs) were evaluated for their efficacy for As (V) removal from aqueous solution. Under optimal experimental conditions As (V) removal efficiency reached 87.3%. Analysis of changes in the surface properties of C–Fe/Ni NPs before and after interaction with As (Ⅴ) using a range of advanced characterization techniques including IC-AFS, SEM-EDS, XPS and XRD revealed that the As removal mechanism involved only adsorption. Adsorption kinetics followed a pseudo-second order rate model (R2 > 0.986) and adsorption best fit the Langmuir isotherm model (R2 > 0.958). Thermodynamic studies indicated that adsorption was a spontaneous endothermic process. On the basis of these results, a removal mechanism of As (Ⅴ) by C–Fe/Ni NPs was proposed. Finally, the efficacy of the material for practical remediation of As from aqueous solution was assessed, including the influence of coexisting anions. While Cl−, NO3− and SO42− had little influence on As (V) removal, both H2PO4− and HCO3− significantly negatively affected removal.
Mechanism of As (V) removal by C–Fe/Ni NPs. [Display omitted]
•Calcined Fe/Ni were synthesized by eucalyptus leaf extract as reducer.•The removal efficiency of As (V) was 87.3% at a concentration of 1 mg L−1.•The As (V) removal mechanism involved only adsorption.•In mine wastewater As (V) removal efficiency reached 82.6%.