Fast removal of heavy metals from water and soil samples using magnetic Fe 3 O 4 nanoparticles
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RECENT TRENDS IN ENVIRONMENT AND SUSTAINABLE DEVELOPMENT
Fast removal of heavy metals from water and soil samples using magnetic Fe3O4 nanoparticles Anita Singh 1 & Sudesh Chaudhary 1 & Brijnandan S. Dehiya 2,3 Received: 3 March 2020 / Accepted: 6 September 2020 # Springer-Verlag GmbH Germany, part of Springer Nature 2020
Abstract Heavy metal discharge from anthropogenic sources on open soil surfaces and in natural water bodies poses serious environmental and health concerns. In addition to the contamination reduction of metals at the source, post-discharge removal of metals using nanoparticles is one of the remediation technologies being explored nowadays due to its cost-effectiveness, being environmentfriendly, and easy application as a technique. In this work, magnetic iron oxide (Fe3O4) nanoparticles were synthesized chemically and then used for the removal of heavy metals (Cd, Cr, Cu, Fe, Ni, Pb, and Zn) from water and soil samples. The heavy metal removal efficiency of these iron oxide nanoparticles for different metals in water was best observed at a pH of 4.5 and varied between 63.5 and 98.3%. However, the removal efficiency of these nanoparticles from the soil sample was only measured at a pH of 0.7, and heavy metal removal efficiency varied between 69.6 and 99.6%. In both soil and water samples, the most efficient remediation time was less than 20 min, after which desorption and even dissolution of the nanoparticles can occur at a highly acidic pH. Among all selected metals for removal, lead showed the best adsorption and hence removal efficiency. The nanoparticles were characterized using the TEM, XRD, and FTIR techniques. The adsorption efficiency of various metals was estimated by using atomic absorption spectroscopy. The results suggest that the removal efficiency and stability of adsorbed products can further be improved by adjusting the pH higher towards 7 and also perhaps by modifying the nanoparticles with functional groups. The primary advantage of the magnetic un-coated nanoparticles is easy and efficient removal of the nanoparticles from the treated solutions by using an ordinary magnet. Keywords Heavy metals . Nanoparticles . Nano-remediation . Retention time . Removal efficiency
Introduction Responsible editor: Tito Roberto Cadaval Jr Electronic supplementary material The online version of this article (https://doi.org/10.1007/s11356-020-10737-9) contains supplementary material, which is available to authorized users. * Sudesh Chaudhary [email protected] * Brijnandan S. Dehiya [email protected] 1
Centre of Excellence for Energy and Environmental Studies, Deenbandhu Chhotu Ram University of Science and Technology, Murthal, Sonipat, Haryana 131039, India
2
Department of Materials Science and Nanotechnology, Deenbandhu Chhotu Ram University of Science and Technology, Murthal, Sonipat, Haryana 131039, India
3
Department of Chemical Engineering, Deenbandhu Chhotu Ram University of Science and Technology, Murthal, Sonipat, Haryana 131039, India
Heavy metal contamination, even a
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