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• W3177764945 abstract "Iron nanoparticles have been successfully used to remove metals from contaminated water. However, most research in this field has been performed with nanoparticles synthesized at the lab-scale. This study compares the capacity of three types of commercial iron nanoparticles, nanoscale zero-valent iron (nZVI), nano-magnetite (nFe 3 O 4 ) and iron sulfide (nFeS) nanoparticles to remove Hg 2+ from artificially contaminated water over a range of pH, dose, and time of contact. The three types of commercial nanoparticles removed Hg 2+ from aqueous solutions being the immobilization processes stable for at least 48 h nZVI particles were faster and more efficient than nFe 3 O 4 and nFeS in terms of Hg removal per unit of iron mass under the experimental conditions tested. The nZVI suspension (0.18 g Fe/L) immobilized 98% of Hg 2+ after 15 min, removal ranging between 94 and 98% at the times tested, regardless of the pH (pH 3 to 9). X-ray photoelectron spectroscopy (XPS) analysis revealed that the mechanism by which nZVI immobilizes Hg 2+ depends on the dose and includes reduction to Hg 0 and adsorption and/or complexation of Hg 2+ to the nZVI shell. In contrast, adsorption was the main mechanism for nFeS (1.6 g Fe/L) and nFe 3 O 4 (3.9 g Fe/L), which removed almost 85 and 80% of Hg 2+ , respectively, after 3 h of contact. The effectiveness of nFe 3 O 4 and nFeS increased slightly over time (until 48 h). The Hg 2+ removal capacity of nFe 3 O 4 increased with the pH, while that of nFeS peaked at neutral and alkaline pH. Given these findings, the three types of iron nanoparticles emerge as potential candidates for the decontamination of Hg-polluted waters. The choice of nanoparticle depends on the efficacy required, the degree of pollution, the cost and length of the process. • Commercial nZVI, nFe 3 O 4 , nFeS removed Hg 2+ from water (100 mg/L). • nZVI particles were the fastest and the most efficient per iron concentration. • pH affected the removal effectiveness of nFe 3 O 4 and nFeS but not that of nZVI. • The mechanism of Hg immobilization with nZVI includes reduction and adsorption. • Adsorption is the main mechanism for Hg immobilization with nFe 3 O 4 and nFeS." @default.
• W3177764945 created "2021-07-19" @default.
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• W3177764945 date "2021-09-01" @default.
• W3177764945 modified "2023-09-30" @default.
• W3177764945 title "Iron nanoparticles are efficient at removing mercury from polluted waters" @default.
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• W3177764945 doi "https://doi.org/10.1016/j.jclepro.2021.128272" @default.
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