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Article

Extracellular Polymeric Substances Facilitate the Adsorption and Migration of Cu2+ and Cd2+ in Saturated Porous Media

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Key Laboratory of Groundwater Resources and Environment, Jilin University, Ministry of Education, Changchun 130021, China
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Jilin Provincial Key Laboratory of Water Resources and Environment, Jilin University, Changchun 130021, China
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Academy of Environmental Planning & Design, Co., Ltd., Nanjing University, Nanjing 210093, China
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Department of Natural Sciences, Faculty of Science and Technology, Middlesex University, The Burroughs, London NW4 4BT, UK
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Author to whom correspondence should be addressed.
Academic Editor: Nuno M. Neves
Biomolecules 2021, 11(11), 1715; https://doi.org/10.3390/biom11111715
Received: 24 October 2021 / Accepted: 8 November 2021 / Published: 17 November 2021
Heavy metal contamination in groundwater is a serious environmental problem. Many microorganisms that survive in subsurface porous media also produce extracellular polymeric substances (EPS), but little is known about the effect of these EPS on the fate and transport of heavy metals in aquifers. In this study, EPS extracted from soil with a steam method were used to study the adsorption behaviors of Cu2+ and Cd2+, employing quartz sand as a subsurface porous medium. The results showed that EPS had a good adsorption capacity for Cu2+ (13.5 mg/g) and Cd2+ (14.1 mg/g) that can be viewed using the Temkin and Freundlich models, respectively. At a pH value of 6.5 ± 0.1 and a temperature of 20 °C, EPS showed a greater affinity for Cu2+ than for Cd2+. The binding force between EPS and quartz sand was weak. The prior saturation of the sand media with EPS solution can significantly promote the migration of the Cu2+ and Cd2+ in sand columns by 8.8% and 32.1%, respectively. When treating both metals simultaneously, the migration of Cd2+ was found to be greater than that of Cu2+. This also demonstrated that EPS can promote the co-migration of Cu2+ and Cd2+ in saturated porous media. View Full-Text
Keywords: extracellular polymeric substances; porous media; heavy metals; adsorption; simulation; migration extracellular polymeric substances; porous media; heavy metals; adsorption; simulation; migration
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MDPI and ACS Style

Wu, Y.; Li, Z.; Yang, Y.; Purchase, D.; Lu, Y.; Dai, Z. Extracellular Polymeric Substances Facilitate the Adsorption and Migration of Cu2+ and Cd2+ in Saturated Porous Media. Biomolecules 2021, 11, 1715. https://doi.org/10.3390/biom11111715

AMA Style

Wu Y, Li Z, Yang Y, Purchase D, Lu Y, Dai Z. Extracellular Polymeric Substances Facilitate the Adsorption and Migration of Cu2+ and Cd2+ in Saturated Porous Media. Biomolecules. 2021; 11(11):1715. https://doi.org/10.3390/biom11111715

Chicago/Turabian Style

Wu, Yuhui, Zhengyu Li, Yuesuo Yang, Diane Purchase, Ying Lu, and Zhenxue Dai. 2021. "Extracellular Polymeric Substances Facilitate the Adsorption and Migration of Cu2+ and Cd2+ in Saturated Porous Media" Biomolecules 11, no. 11: 1715. https://doi.org/10.3390/biom11111715

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