Roxarsone is a phenyl-substituted arsonic acid comprising both arsenate and benzene rings. Few adsorbents are designed for the effective capture of both the organic and inorganic moieties of ROX molecules. Herein, nano zerovalent iron (nZVI) particles were incorporated on the surface of sludge-based biochar (SBC) to fabricate a dual-affinity sorbent that attracts both the arsenate and benzene rings of ROX. The incorporation of nZVI particles significantly increased the binding affinity and sorption capacity for ROX molecules compared to pristine SBC and pure nZVI. The enhanced elimination of ROX molecules was ascribed to synergetic adsorption and degradation reactions, through π-π* electron donor/acceptor interactions, H-bonding, and As-O-Fe coordination. Among these, the predominate adsorption force was As-O-Fe coordination. During the sorption process, some ROX molecules were decomposed into inorganic arsenic and organic metabolites by the reactive oxygen species (ROS) generated during the early stages of the reaction. The degradation pathways of ROX were proposed according to the oxidation intermediates. This work provides a theoretical and experimental basis for the design of adsorbents according to the structure of the target pollutant.

中文翻译：

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通过基于污泥的生物炭支持的零价铁纳米复合物增强去除洛克沙酮及其代谢物的机理研究：吸附和氧化还原转化。

洛克沙s是包含砷酸盐和苯环的苯基取代的砷酸。很少有吸附剂设计用于有效捕获ROX分子的有机和无机部分。在本文中，将纳米零价铁（nZVI）颗粒掺入基于污泥的生物炭（SBC）的表面上，以制备双亲和吸附剂，该吸附剂同时吸附ROX的砷酸盐和苯环。与原始SBC和纯nZVI相比，nZVI颗粒的掺入显着提高了ROX分子的结合亲和力和吸附能力。通过π-π*电子给体/受体相互作用，H键和As-O-Fe配位，使ROX分子消除的增强归因于协同吸附和降解反应。其中，主要的吸附力是As-O-Fe配位。在吸附过程中，一些ROX分子被反应早期产生的活性氧（ROS）分解为无机砷和有机代谢产物。根据氧化中间体提出了ROX的降解途径。这项工作为根据目标污染物的结构设计吸附剂提供了理论和实验基础。