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Article

Transport of Cu2+ in Unsaturated Porous Medium with Humic Acid/Iron Oxide Nanoparticle (Fe3O4) Amendment

1
School of Environment, Northeast Normal University, No. 2555, Jingyue Street, Changchun 130117, China
2
Henan Key Laboratory of Groundwater Pollution Prevention and Rehabilitation, Zhengzhou 450001, China
*
Author to whom correspondence should be addressed.
Water 2021, 13(2), 200; https://doi.org/10.3390/w13020200
Received: 16 December 2020 / Revised: 7 January 2021 / Accepted: 13 January 2021 / Published: 15 January 2021
(This article belongs to the Section Hydrology)
Humic acid (HA) and iron oxide (such as Fe3O4) nanoparticles are widely distributed in soil, and their complex embedded in soil might affect the transport and fate of Cu2+ in the vadose zone, while Cu2+ is a serious threat to the underlying groundwater. In this study, we synthesized a composite of Fe3O4 nanoparticles coated with HA ([email protected]) using as an amendment a packed sand matrix in the transport column experiments. The impacts of HA content and ion strength (IS) on Cu2+ transport in the unsaturated columns were investigated. The results showed that HA exhibited a stronger inhibition effect on Cu2+ transport, and a higher IS enhanced the mobility of Cu2+ in an unsaturated porous medium in the presence of [email protected] The recovery ratio (Rr) of Cu2+ breakthrough in the column decreased from 66.56% to 3.94% while the mass concentration ratio CHA/CNPs increased from 0 to 50 in the [email protected] complex. The Rr increased by 1.64 times while the IS increased from 0 to 100 mM. Batch adsorption experiments, kinetics and isotherm models, and Fourier transform infrared (FTIR) spectra analysis were implemented to elucidate the underlying mechanism. It was found that HA embedded in the sand matrix could bind Cu2+ by forming stable chelate, while the IS-dependent Cu2+ transport could be attributed to the competitive adsorption between Na+ and Cu2+. Our study demonstrates that the physicochemical environment, as well as the presence of iron oxide nanoparticles and natural organic matter, can significantly impact Cu2+ transport in unsaturated porous medium. View Full-Text
Keywords: unsaturated porous media; Fe3O4 nanoparticles; humic acid; ionic strength; Cu2+ transport unsaturated porous media; Fe3O4 nanoparticles; humic acid; ionic strength; Cu2+ transport
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MDPI and ACS Style

Lin, S.; Shi, M.; Wang, Q.; Yang, J.; Zhang, G.; Liu, X.; Fan, W. Transport of Cu2+ in Unsaturated Porous Medium with Humic Acid/Iron Oxide Nanoparticle (Fe3O4) Amendment. Water 2021, 13, 200. https://doi.org/10.3390/w13020200

AMA Style

Lin S, Shi M, Wang Q, Yang J, Zhang G, Liu X, Fan W. Transport of Cu2+ in Unsaturated Porous Medium with Humic Acid/Iron Oxide Nanoparticle (Fe3O4) Amendment. Water. 2021; 13(2):200. https://doi.org/10.3390/w13020200

Chicago/Turabian Style

Lin, Shanshan, Mengdi Shi, Qi Wang, Junlin Yang, Gubin Zhang, Xiangru Liu, and Wei Fan. 2021. "Transport of Cu2+ in Unsaturated Porous Medium with Humic Acid/Iron Oxide Nanoparticle (Fe3O4) Amendment" Water 13, no. 2: 200. https://doi.org/10.3390/w13020200

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