Efficient removal of As (Ⅲ) by calcined green synthesized bimetallic Fe/Pd nanoparticles based on adsorption and oxidation

• Published in: Journal of cleaner production Vol. 286; p. 124987
• Main Authors: Lin, Yuanqiong, Jin, Xiaoying, Khan, Nasreen Islam, Owens, Gary, Chen, Zuliang
• Format: Journal Article
• Language: English
• Published: Elsevier Ltd 01-03-2021
• Subjects: Adsorption; As (III); Calcined; Fe/Pd NPs; Oxidation; Removal; As (III); Removal; Calcined; Oxidation; Fe/Pd NPs; Adsorption
• ISSN: 0959-6526; 1879-1786
• DOI: 10.1016/j.jclepro.2020.124987

Arsenic pollution has become one of main threats to global drinking water safety and urgently needs to be cost effectively remediated. Here, calcined green bimetallic Fe/Pd nanoparticles (Calcined-Fe/Pd NPs) were synthesized using a eucalyptus leaf extract and successfully applied for As (III) removal from wastewaters, achieving a 100% removal efficiency under optimal experiment conditions. To better understand the highly effective removal mechanism, Calcined-Fe/Pd NPs were characterized by various techniques. While Transmission Electron Microscope (TEM), Energy Dispersive Spectrometer (EDS) and X-ray diffraction (XRD) indicated that As (III) adsorption was substantial; both X-ray photoelectron spectroscopy (XPS) and ion chromatography-atomic fluorescence spectrometer (IC-AFS) indicted that during adsorption As (III) was oxidized to As (V). Kinetic fitting of results revealed that adsorption obeyed a pseudo-second-order model (R2 = 0.986) and Langmuir isotherm (R2 = 0.994), whereas oxidation best fit a pseudo first order model (R2 = 0.927). Thus, an overall mechanism for As (III) removal based on adsorption and oxidation was proposed. The utility of practically using calcined green synthesized bimetallic Fe/Pd nanoparticles was also validated by the removal of >90% As (III) from drinking water.
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•C–Fe/Pd NPs were successfully synthesized.•The removal efficiency of As (Ⅲ) reached 100%.•The removal mechanism was based on adsorption and oxidation.•Effective removal of As (III) from drinking water was demonstrated.