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在黑暗条件下通过黑碳减少
Kaikai Zhang1, Liuwei Wang1, Muhan Qin1
1School of Environment, Tsinghua University, Beijing 100084, China.
黑碳 (BC) 在黑暗中促进 (Hg) 的减少,主要是通过吸附,然后转化为元素 (Hg0). 这突显了BC在生物地质化学中的关键作用.
科学领域:
- 环境化学环境化学
- 地质化学 地质化学
- 生物地质化学生物地质化学
背景情况:
- 减少 (Hg) 对于预测其在水和土壤环境中的生物地球化学循环至关重要.
- 虽然理解了Hg光减光,但暗色减光机制的特征仍然很差.
- 黑碳 (BC) 是一种常见的有机物成分,影响环境中的Hg转化.
研究的目的:
- 为了研究黑碳 (BC) 对 (Hg2+) 的暗色还原.
- 阐明由BC.介导的Hg降低的机制和动力学.
- 确定BC上负责降低Hg的关键功能组.
主要方法:
- 研究了BC/Hg2+溶液中Hg2+去除和减少的反应动力学.
- 使用现场电子磁共振 (EPR) 来检测反应中间体.
- 分析了溶解的BC和微粒BC的芳香CH基在Hg降低中的作用.
主要成果:
- 通过BC观察到快速的Hg2+去除,归因于联合吸附和减少.
- 与Hg去除相比,确定了缓慢的Hg降低动力学,表明最初的吸附主导.
- 在降低Hg过程中检测到持久的自由基作为中间体,与芳香CH群相关.
- 发现在微粒BC上溶解的BC和芳香的CH是降Hg的关键驱动因素.
- 确定中间体的转化为一氧化碳 (CO) 和元素 (Hg0).
结论:
- 碳黑在的暗色减少中起着重要作用.
- 通过BC去除Hg最初主要是通过吸附,然后是减少吸附的Hg2+.
- 在BC上的芳香CH功能对于通过激素中间体调解Hg降低至关重要.
- 了解BC介导的Hg降低对于评估的环境命运和生物地球化学循环至关重要.
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