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酸调节Fe (II) 介导的降解在模拟的海洋和陆地交织区:双刃剑效应

Yuan Xue¹, Yizi Hua¹, Zhi Li¹

¹MOE Key Laboratory of Pollution Processes and Environmental Criteria/Tianjin Engineering Center of Environmental Diagnosis and Contamination Remediation, College of Environmental Science and Engineering, Nankai University, Tianjin 300350, PR China.

Journal of hazardous materials

|February 26, 2026

概括

沿海地下水中的 (Cr) 污染是一个风险. 铁 (Fe (II)) 和酸 (HA) 共同作用,将有毒的Cr (VI) 降低到不那么有害的Cr (III),有效地固定它.

科学领域:

环境化学环境化学
地质化学地质化学
环境科学环境科学

背景情况:

海陆交互区 (MTIZ) 的地下水容易受到 (Cr) 的污染.
六价 (Cr(VI)) 是高度溶解和有毒的,与三价 (Cr(III)) 不同.
了解Cr(VI) 降低机制对于管理MTIZ环境中的风险至关重要.

研究的目的:

研究铁 (Fe (II)) 和酸 (HA) 在模拟的MTIZ地下水中对Cr (VI) 固定的联合作用.
阐明控制Cr (VI) 减少和封存的合作机制和影响因素.
评估反应性氧物种在Cr (VI) 减少过程中的作用.

主要方法:

采用了一种模拟模拟MTIZ水地化学条件的双室模拟系统.
实验涉及控制的pH值,溶解的氧气,以及添加Fe (II) 和HA到含有Cr (VI) 的溶液中.
检测到了反应性氧物种,并通过火实验调查了它们的作用.

主要成果:

在受控的MTIZ条件下,Fe (II) 迅速降低了Cr (VI).
胺酸最初减缓了动力学,但随着时间的推移,提高了总体Cr (VI) 清除的15%.
反应性氧物种,特别是超氧化基 (·O2−),对于Cr(VI) 减少至关重要,而基 (·OH) 则具有抑制作用.
(VI) 主要转化为稳定的 (OH) 3沉物和HA-Fe-Cr复合物.
铁沉 (FeOOH) 进一步通过吸附促进了Cr的封存.

结论:

在MTIZ地下水中,Fe (II) 和HA表现出有效的Cr (VI) 固定化的合作机制.
反应性氧物种在Cr (VI) 转化中发挥着重要的,尽管复杂的作用.
该研究为了解Cr行为和评估脆弱沿海地下水系统的风险提供了一个框架.

关键词:

(Chromium) 是一种含的物质.有铁的铁铁.地下水的地下水.胺酸是一种胺酸.海洋-陆地交织区的交织区

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