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首页> 美国卫生研究院文献>International Journal of Environmental Research and Public Health >Sorption Behavior of Hexabromocyclododecanes (HBCDs) on Weihe River Sediment
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Sorption Behavior of Hexabromocyclododecanes (HBCDs) on Weihe River Sediment

机译：六溴环十二烷（六溴环十二烷）在渭河沉积物上的吸附行为

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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 0.94–0.98) and Langmuir (R 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.
机译：六溴环十二烷（六溴环十二烷）在沉积物上的吸附会影响六溴环十二烷在河流中的命运和运输。通过分批平衡实验研究了六溴环十二烷在渭河沉积物上的吸附，并评估了pH离子，浓度和腐殖酸浓度（HA）的变化对吸附的影响。获得的结果表明，快速而不是缓慢的吸附是主要过程。获得了非线性吸附等温线，Freundlich（R 0.94-0.98）和Langmuir（R 0.95-0.99）模型都很好地描述了六溴环十二烷的吸附。使用Langmuir模型计算α-六溴环十二烷，β-六溴环十二烷和γ-六溴环十二烷的吸附容量，分别为443.56、614.29和1146.37 mg / kg。热力学分析表明，六溴环十二烷在沉积物上的吸附是自发的放热过程。 HBCD的吸附受HA浓度和离子强度的影响。随着离子强度的增加，吸附到沉积物上的六溴环十二烷的量减少，然后随着HA浓度的增加先增加，然后减少。 pH的变化并未明显影响六溴环十二烷的吸附。利用同步辐射傅立叶变换红外光谱（SR-FTIR）表征了吸附机理，结果表明疏水相互作用主导了六溴环十二烷在沉积物上的吸附机理。

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