Extracellular Polymeric Substances Facilitate the Adsorption and Migration of Cu<sup>2+</sup> and Cd<sup>2+</sup> in Saturated Porous Media

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...

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Autores principales:	Yuhui Wu, Zhengyu Li, Yuesuo Yang, Diane Purchase, Ying Lu, Zhenxue Dai
Formato:	article
Lenguaje:	EN
Publicado:	MDPI AG 2021
Materias:	extracellular polymeric substances porous media heavy metals adsorption simulation migration Microbiology QR1-502
Acceso en línea:	https://doaj.org/article/ac320a302b0b424fb21a342a8cb7bd74
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spelling	oai:doaj.org-article:ac320a302b0b424fb21a342a8cb7bd742021-11-25T16:54:15ZExtracellular Polymeric Substances Facilitate the Adsorption and Migration of Cu<sup>2+</sup> and Cd<sup>2+</sup> in Saturated Porous Media10.3390/biom111117152218-273Xhttps://doaj.org/article/ac320a302b0b424fb21a342a8cb7bd742021-11-01T00:00:00Zhttps://www.mdpi.com/2218-273X/11/11/1715https://doaj.org/toc/2218-273XHeavy 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 Cu<sup>2+</sup> and Cd<sup>2+</sup>, employing quartz sand as a subsurface porous medium. The results showed that EPS had a good adsorption capacity for Cu<sup>2+</sup> (13.5 mg/g) and Cd<sup>2+</sup> (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 Cu<sup>2+</sup> than for Cd<sup>2+</sup>. 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 Cu<sup>2+</sup> and Cd<sup>2+</sup> in sand columns by 8.8% and 32.1%, respectively. When treating both metals simultaneously, the migration of Cd<sup>2+</sup> was found to be greater than that of Cu<sup>2+</sup>. This also demonstrated that EPS can promote the co-migration of Cu<sup>2+</sup> and Cd<sup>2+</sup> in saturated porous media.Yuhui WuZhengyu LiYuesuo YangDiane PurchaseYing LuZhenxue DaiMDPI AGarticleextracellular polymeric substancesporous mediaheavy metalsadsorptionsimulationmigrationMicrobiologyQR1-502ENBiomolecules, Vol 11, Iss 1715, p 1715 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	extracellular polymeric substances porous media heavy metals adsorption simulation migration Microbiology QR1-502
spellingShingle	extracellular polymeric substances porous media heavy metals adsorption simulation migration Microbiology QR1-502 Yuhui Wu Zhengyu Li Yuesuo Yang Diane Purchase Ying Lu Zhenxue Dai Extracellular Polymeric Substances Facilitate the Adsorption and Migration of Cu<sup>2+</sup> and Cd<sup>2+</sup> in Saturated Porous Media
description	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 Cu<sup>2+</sup> and Cd<sup>2+</sup>, employing quartz sand as a subsurface porous medium. The results showed that EPS had a good adsorption capacity for Cu<sup>2+</sup> (13.5 mg/g) and Cd<sup>2+</sup> (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 Cu<sup>2+</sup> than for Cd<sup>2+</sup>. 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 Cu<sup>2+</sup> and Cd<sup>2+</sup> in sand columns by 8.8% and 32.1%, respectively. When treating both metals simultaneously, the migration of Cd<sup>2+</sup> was found to be greater than that of Cu<sup>2+</sup>. This also demonstrated that EPS can promote the co-migration of Cu<sup>2+</sup> and Cd<sup>2+</sup> in saturated porous media.
format	article
author	Yuhui Wu Zhengyu Li Yuesuo Yang Diane Purchase Ying Lu Zhenxue Dai
author_facet	Yuhui Wu Zhengyu Li Yuesuo Yang Diane Purchase Ying Lu Zhenxue Dai
author_sort	Yuhui Wu
title	Extracellular Polymeric Substances Facilitate the Adsorption and Migration of Cu<sup>2+</sup> and Cd<sup>2+</sup> in Saturated Porous Media
title_short	Extracellular Polymeric Substances Facilitate the Adsorption and Migration of Cu<sup>2+</sup> and Cd<sup>2+</sup> in Saturated Porous Media
title_full	Extracellular Polymeric Substances Facilitate the Adsorption and Migration of Cu<sup>2+</sup> and Cd<sup>2+</sup> in Saturated Porous Media
title_fullStr	Extracellular Polymeric Substances Facilitate the Adsorption and Migration of Cu<sup>2+</sup> and Cd<sup>2+</sup> in Saturated Porous Media
title_full_unstemmed	Extracellular Polymeric Substances Facilitate the Adsorption and Migration of Cu<sup>2+</sup> and Cd<sup>2+</sup> in Saturated Porous Media
title_sort	extracellular polymeric substances facilitate the adsorption and migration of cu<sup>2+</sup> and cd<sup>2+</sup> in saturated porous media
publisher	MDPI AG
publishDate	2021
url	https://doaj.org/article/ac320a302b0b424fb21a342a8cb7bd74
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Extracellular Polymeric Substances Facilitate the Adsorption and Migration of Cu<sup>2+</sup> and Cd<sup>2+</sup> in Saturated Porous Media

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