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competitive sorption between 17α-ethinyl estradiol and bisphenol A/4-n-nonylphenol by soils

Journal of Environmental Sciences 2013年第6期25卷 1154-1163页

作者： Jianzhong Li Lu Jiang Xi Xiang Shuang Xu Rou Wen Xiang Liu School of Environment Tsinghua University

The sorption of 17α-ethinyl estradiol （EE2）, bisphenol A （BPA）, and 4-n-nonylphenol （NP） in single systems and the sorption of EE2 with different initial aqueous concentrations of BPA or NP were examined using three soils. Results showed that all sorption isotherms were nonlinear and fit the Freundlich model. The degree of nonlinearity was in the order BPA （0.537-0.686）〉 EE2 （0.705-0.858）〉 NP （0.875-0.0.951） in single systems. The isotherm linearity index of EE2 sorption calculated by the Freundlich model for Loam, Silt Loam and Silt increased from 0.758, 0.705 and 0.858, to 0.889, 0.910 and 0.969, respectively, when BPA concentration increased from 0 to 1000 μg/L, but the effect of NP was comparably minimal. Additionally, EE2 significantly suppressed the sorption of BPA, but insignificantly suppressed that of NE These findings can be attributed to the difference of sorption affinity of EE2, NP and BPA on the hard carbon （e.g., black carbon） of soil organic matter that dominated the sorption in the low equilibrium aqueous concentration range of endocrine-disrupting chemicals （EDCs）. competitive sorption among EDCs presents new challenges for predicting the transport and fate of EDCs under the influence of co-solutes.

关键词： competitive sorption 17α-ethinyl estradiol endocrine-disrupting chemicals distributed reactivity model black carbon

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sorption mechanism of naphthalene by diesel soot: Insight from displacement with phenanthrene/p-nitrophenol

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Journal of Environmental Sciences 2021年第8期33卷 136-146页

作者： Wenhao Wu Yun Huang Daohui Lin Kun Yang Department of Environmental Science Zhejiang UniversityHangzhou 310058China Key Laboratory of Environmental Pollution and Ecological Health of Ministry of Education Hangzhou 310058China Zhejiang Provincial Key Laboratory of Organic Pollution Process and Control Hangzhou 310058China

The nonlinear sorption of hydrophobic organic contaminants(HOCs)could be changed to linear sorption by the suppression of coexisting solutes in natural system,resulting in the enhancement of mobility,bioavailability and risks of HOCs in the *** previous study,inspired from the competitive adsorption on activated carbon(AC),the displaceable fraction of HOCs sorption to soot by competitor was attributed to the adsorption on elemental carbon fraction of soot(EC-Soot),while the linear and nondisplaceable fraction was attributed to the partition in authigenic organic matter of soot(OM-Soot).In this study,however,we observed that the linear and nondisplaceable fraction of HOC(naphthalene)to a diesel soot(D-Soot)by competitor(phenanthrene or p-nitrophenol)should be attributed to not only the linear partition in OM-Soot,but also the residual linear adsorption on *** also observed that the competition on the surface of soot dominated by external surface was different from that of AC dominated by micropore surface,i.e.,complete displacement of HOCs by p-nitrophenol could occur for the micropore surface of AC,but not for the external surface of *** observations were obtained through the separation of EC-Soot and OM-Soot from D-Soot with organic-solvent extraction and the sorption comparisons of D-Soot with an AC(ACF300)and a multiwalled carbon nanotube(MWCNT30).The obtained results would give new insights to the sorption mechanisms of HOCs by soot and help to assess their environmental risks.

关键词： competitive sorption Diesel soot Organic compounds Linearity External surface

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