High levels of hydrophobic organic compounds (HOCs) have been detected in the landfill leachates. However, due to the complex leachate composition with high organic content, removing HOCs has proven to be challenging. Herein, we focused on the efficiency and selectivity of polyamide microplastics (PA MPs) in adsorbing HOCs from real landfill leachate. Using bisphenol A (BPA) as a model HOC, PA MPs highly selectively removed 100 % of trace concentrations (1–500 μg·L-1) of BPA from leachate containing 827 mg·L-1 of dissolved organic carbon (the concentration ratio of DOC/pollutant was up to 8.27 × 105). Density functional theory calculations confirmed that the selectivity of PA MPs in leachate was primarily related to hydrogen bonding. Various environmental factors (solution pH, anions, natural organic matters, hydrophilic pollutants, dissolved organic carbon, and the high chroma of leachates) had little effects on the adsorption of BPA. Furthermore, PA MPs were completely removed by magnetic zero-valent iron loaded with porous carbon through simple shaking. This study demonstrates PA MP’s effectiveness in selectively removing trace HOCs from leachate and showed significant industrial potential for wastewater treatment.

中文翻译：

---

通过聚酰胺微塑料高效、高选择性地深度去除渗滤液中的疏水性有机化合物


在垃圾填埋场渗滤液中检测到高水平的疏水性有机化合物 （HOC）。然而，由于渗滤液成分复杂且有机物含量高，因此去除 HOC 已被证明具有挑战性。在本文中，我们重点介绍了聚酰胺微塑料 （PA MP） 在从实际垃圾填埋渗滤液中吸附 HOC 的效率和选择性。使用双酚 A （BPA） 作为模型 HOC ，PA MPS 高度选择性地去除了 100% 的痕量浓度 （1–500 μg·L-1） 来自浸出液中 BPA 的 827 mg·L-1 的溶解有机碳（DOC /污染物浓度比高达 8.27 × 105）。密度泛函理论计算证实，PA MP 在渗滤液中的选择性主要与氢键有关。各种环境因素 （溶液 pH 值、阴离子、天然有机物、亲水性污染物、溶解有机碳和浸出液的高色度） 对 BPA 的吸附影响不大。此外，通过简单的摇动，负载多孔碳的磁性零价铁完全去除了 PA MPS。本研究证明了 PA MP 在选择性地从渗滤液中去除痕量 HOC 的有效性，并显示出废水处理的巨大工业潜力。