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Mercury Reduction by Black Carbon under Dark Conditions

发布时间：2024-09-28点击次数：

  • DOI码：10.1016/j.watres.2023.120241
  • 发表刊物：Water Research
  • 项目来源：国家自然科学基金青年项目
  • 关键字：Black carbon; Hg reduction; In situ electron paramagnetic resonance; Persistent free radicals
  • 摘要：An accurate depiction of mercury (Hg) reduction is important to predict Hg biogeochemistry in both aquatic and soil systems. Although the photoreduction of Hg is well documented, reduction in the dark is poorly known and is thus the focus of this work. Black carbon (BC), an important constituent of organic matter in environments, can reduce Hg2+ in dark and oxygen-deficient conditions. Fast removal of Hg2+ in BC/Hg2+ solution was observed, with 4.99–86.88 L mg−1h−1 of the reaction rate constant, which could be ascribed to the combined actions of adsorption and reduction. Meanwhile, slow Hg reduction was obtained, compared to Hg removal, with 0.06–2.16 L mg−1h−1 of the reaction rate constant. Thus, in the initial stage, Hg2+ removal was mainly triggered by adsorption, rather than reduction. Afterward, the adsorbed Hg2+ on black carbon was converted into Hg0. Dissolved black carbon and aromatic C[sbnd]H on particulate black carbon were dominant triggers of Hg reduction for black carbon. During Hg reduction, the intastable intermediate, formed in the complex between aromatic C[sbnd]H and Hg2+, behaved as persistent free radicals, which could be detected by in situ electron paramagnetic resonance. Subsequently, the intastable intermediate was mainly converted into C[sbnd]O on black carbon and Hg0. Corresponding results of the present study highlight the important role of black carbon in the Hg biogeochemical cycle.
  • 论文类型：期刊论文
  • 论文编号：120241
  • 学科门类：工学
  • 一级学科：环境科学与工程
  • 文献类型：J
  • 卷号：242
  • ISSN号：0043-1354
  • 是否译文：否
  • 发表时间：2023-08-15
  • 收录刊物：SCI
  • 发布期刊链接：https://www.sciencedirect.com/science/article/pii/S0043135423006772?pes=vor

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张凯凯

个人信息

  • 教师英文名称：Kaikai Zhang
  • 教师拼音名称：zhangkaikai
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  • 所在单位：环境与测绘学院
  • 性别：男
  • 学位：工学博士学位

曾获荣誉：

  • 2021-09-272020 年度华中科技大学环境学院国祯环卫一等奖学金
  • 2023-05-15第八届地学青年地学论坛优秀学生报告奖

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