Natural mineral colloids facilitated transport of EE2 in saturated porous media: Effects of humic acid and conjugate form

IF 3.5 3区 环境科学与生态学 Q2 ENVIRONMENTAL SCIENCES
Xiaoming Song , Yingjun Li , Zhipeng Zhang , Yujuan Wen , Yunlong Wang
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引用次数: 0

Abstract

Steroid estrogens have posed significant ecological risks to aquatic organisms due to their potent endocrine-disrupting effects. The role of natural mineral colloids in facilitating the transport of hydrophobic organic pollutants in the environment has been confirmed, but the control mechanisms of colloids on 17α-Ethinylestradiol (EE2) migration in the subsurface environment are often still not well understood. This study combined the batch sorption equilibrium experiments and dynamic transport simulations to reveal the interface interactions and co-transport characteristics between illite colloids and EE2 at both macroscopic and microscopic levels. The existing form changes of EE2 and the influence of coexisting humic acid (HA) during transport in porous media were also specifically investigated. The batch experiments demonstrated that the primary mechanisms governing EE2 sorption onto illite colloids involved surface sorption and hydrogen bonding. The coexistence of HA could load onto the surface of illite colloids, thereby enhancing the colloidal sorption capacity for EE2. Transport experiments demonstrated that the migratory ability of EE2 in silty clay was limited, but illite colloids could significantly promote its penetration, with the peak penetration content (Ct/C0) increasing from 0.64 to 0.77. In the absence of HA, EE2 primarily transported in a dissolved form, accounting for 62.86% of the total concentrations. When HA concentrations were increased to 10 mg/L and 20 mg/L, the proportion of colloidal conjugate EE2 in the effluents reached 52.13% and 54.49%, respectively. The enhanced transport of EE2 by HA was primarily attributed to the improved migration ability of illite colloids and the increased proportion of illite-EE2 conjugate, resulting in a maximum Ct/C0 value of 0.94. The validity of these results was further confirmed by employing calculations based on the Derjaguin–Landau–Verwey–Overbeek and Colloidal Filtration Theory. This study provides new insights of understanding the transport of EE2 in subsurface environment.

天然矿物胶体促进了 EE2 在饱和多孔介质中的迁移:腐殖酸和共轭形式的影响
甾体雌激素具有强烈的内分泌干扰作用,对水生生物的生态环境构成了重大风险。天然矿物胶体在促进疏水性有机污染物在环境中迁移方面的作用已得到证实,但胶体对 17α-炔雌醇(EE2)在地下环境中迁移的控制机制往往仍不甚明了。本研究结合批量吸附平衡实验和动态迁移模拟,从宏观和微观两个层面揭示了伊利石胶体与 EE2 之间的界面相互作用和共迁移特性。此外,还具体研究了 EE2 在多孔介质中迁移过程中的现有形态变化以及共存腐植酸(HA)的影响。批量实验表明,伊利石胶体吸附 EE2 的主要机制涉及表面吸附和氢键。HA 的共存可以负载到伊利石胶体的表面,从而增强胶体对 EE2 的吸附能力。迁移实验表明,EE2 在淤泥中的迁移能力有限,但伊利石胶体能显著促进其渗透,渗透峰值含量(Ct/C0)从 0.64 增加到 0.77。在没有 HA 的情况下,EE2 主要以溶解形式迁移,占总浓度的 62.86%。当 HA 浓度增加到 10 mg/L 和 20 mg/L 时,污水中胶体共轭 EE2 的比例分别达到 52.13% 和 54.49%。HA 增强了 EE2 的迁移能力,这主要归功于伊利石胶体迁移能力的提高和伊利石-EE2 共轭物比例的增加,从而使 Ct/C0 值达到最大值 0.94。根据 Derjaguin-Landau-Verwey-Overbeek 和胶体过滤理论进行的计算进一步证实了这些结果的正确性。这项研究为了解 EE2 在地下环境中的迁移提供了新的视角。
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来源期刊
Journal of contaminant hydrology
Journal of contaminant hydrology 环境科学-地球科学综合
CiteScore
6.80
自引率
2.80%
发文量
129
审稿时长
68 days
期刊介绍: The Journal of Contaminant Hydrology is an international journal publishing scientific articles pertaining to the contamination of subsurface water resources. Emphasis is placed on investigations of the physical, chemical, and biological processes influencing the behavior and fate of organic and inorganic contaminants in the unsaturated (vadose) and saturated (groundwater) zones, as well as at groundwater-surface water interfaces. The ecological impacts of contaminants transported both from and to aquifers are of interest. Articles on contamination of surface water only, without a link to groundwater, are out of the scope. Broad latitude is allowed in identifying contaminants of interest, and include legacy and emerging pollutants, nutrients, nanoparticles, pathogenic microorganisms (e.g., bacteria, viruses, protozoa), microplastics, and various constituents associated with energy production (e.g., methane, carbon dioxide, hydrogen sulfide). The journal''s scope embraces a wide range of topics including: experimental investigations of contaminant sorption, diffusion, transformation, volatilization and transport in the surface and subsurface; characterization of soil and aquifer properties only as they influence contaminant behavior; development and testing of mathematical models of contaminant behaviour; innovative techniques for restoration of contaminated sites; development of new tools or techniques for monitoring the extent of soil and groundwater contamination; transformation of contaminants in the hyporheic zone; effects of contaminants traversing the hyporheic zone on surface water and groundwater ecosystems; subsurface carbon sequestration and/or turnover; and migration of fluids associated with energy production into groundwater.
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