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Sorption Behavior of Hexabromocyclododecanes (HBCDs) on Weihe River Sediment

The sorption of hexabromocyclododecanes (HBCDs) on sediment affects the fate and transport of HBCDs in rivers. The sorption of HBCDs on sediment from the Weihe River was investigated by performing batch equilibration experiments, and the effects of changing the pH ionic, strength, and humic acid con...

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Autores principales: Wang, Xueli, Yuan, Xiaoyu, Yang, Shengke
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2019
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6981516/
https://www.ncbi.nlm.nih.gov/pubmed/31905817
http://dx.doi.org/10.3390/ijerph17010247
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author Wang, Xueli
Yuan, Xiaoyu
Yang, Shengke
author_facet Wang, Xueli
Yuan, Xiaoyu
Yang, Shengke
author_sort Wang, Xueli
collection PubMed
description The sorption of hexabromocyclododecanes (HBCDs) on sediment affects the fate and transport of HBCDs in rivers. The sorption of HBCDs on sediment from the Weihe River was investigated by performing batch equilibration experiments, and the effects of changing the pH ionic, strength, and humic acid concentration (HA) on sorption were evaluated. The obtained results indicated that fast rather than slow sorption was the dominant process. Nonlinear sorption isotherms were acquired, and the Freundlich (R(2) 0.94–0.98) and Langmuir (R(2) 0.95–0.99) models both described the sorption of HBCDs well. The adsorption capacity for α-HBCD, β-HBCD, and γ-HBCD were calculated using the Langmuir model, and were 443.56, 614.29 and 1146.37 mg/kg, respectively. Thermodynamic analysis shows that HBCDs sorption on sediment is a spontaneous exothermic process. HBCDs sorption was affected by the HA concentration and ionic strength. The amounts of HBCDs sorbed to the sediment decreased as the ionic strength increased, and first increased and then decreased as the HA concentration increased. Changes in pH did not clearly affect the sorption of HBCDs. Synchrotron radiation Fourier-transform infrared spectra (SR-FTIR) was used to characterize the adsorption mechanism, and the obtained result indicated that hydrophobic interactions dominated the mechanism involved in HBCDs sorption on sediment.
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spelling pubmed-69815162020-02-03 Sorption Behavior of Hexabromocyclododecanes (HBCDs) on Weihe River Sediment Wang, Xueli Yuan, Xiaoyu Yang, Shengke Int J Environ Res Public Health Article The sorption of hexabromocyclododecanes (HBCDs) on sediment affects the fate and transport of HBCDs in rivers. The sorption of HBCDs on sediment from the Weihe River was investigated by performing batch equilibration experiments, and the effects of changing the pH ionic, strength, and humic acid concentration (HA) on sorption were evaluated. The obtained results indicated that fast rather than slow sorption was the dominant process. Nonlinear sorption isotherms were acquired, and the Freundlich (R(2) 0.94–0.98) and Langmuir (R(2) 0.95–0.99) models both described the sorption of HBCDs well. The adsorption capacity for α-HBCD, β-HBCD, and γ-HBCD were calculated using the Langmuir model, and were 443.56, 614.29 and 1146.37 mg/kg, respectively. Thermodynamic analysis shows that HBCDs sorption on sediment is a spontaneous exothermic process. HBCDs sorption was affected by the HA concentration and ionic strength. The amounts of HBCDs sorbed to the sediment decreased as the ionic strength increased, and first increased and then decreased as the HA concentration increased. Changes in pH did not clearly affect the sorption of HBCDs. Synchrotron radiation Fourier-transform infrared spectra (SR-FTIR) was used to characterize the adsorption mechanism, and the obtained result indicated that hydrophobic interactions dominated the mechanism involved in HBCDs sorption on sediment. MDPI 2019-12-30 2020-01 /pmc/articles/PMC6981516/ /pubmed/31905817 http://dx.doi.org/10.3390/ijerph17010247 Text en © 2019 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).
spellingShingle Article
Wang, Xueli
Yuan, Xiaoyu
Yang, Shengke
Sorption Behavior of Hexabromocyclododecanes (HBCDs) on Weihe River Sediment
title Sorption Behavior of Hexabromocyclododecanes (HBCDs) on Weihe River Sediment
title_full Sorption Behavior of Hexabromocyclododecanes (HBCDs) on Weihe River Sediment
title_fullStr Sorption Behavior of Hexabromocyclododecanes (HBCDs) on Weihe River Sediment
title_full_unstemmed Sorption Behavior of Hexabromocyclododecanes (HBCDs) on Weihe River Sediment
title_short Sorption Behavior of Hexabromocyclododecanes (HBCDs) on Weihe River Sediment
title_sort sorption behavior of hexabromocyclododecanes (hbcds) on weihe river sediment
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6981516/
https://www.ncbi.nlm.nih.gov/pubmed/31905817
http://dx.doi.org/10.3390/ijerph17010247
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AT yangshengke sorptionbehaviorofhexabromocyclododecaneshbcdsonweiheriversediment