Fe (II) 协调过渡调节了还原性脱:被忽视的乳酸盐的非生物作用
Qian-Qian Jia1, Xue-Jie Zhang2, Liandong Zhu3
1School of Civil Engineering, Wuhan University, No. 8, East Lake South Road, Wuhan, China; State Key Laboratory of Water Resources and Hydropower Engineering Science, Wuhan University, 430072 China; School of Environmental and Chemical Engineering, Jiangsu University of Science and Technology, Zhenjiang 212100, China.
乳酸盐通过改变Fe (II) 协调来增强非生物Fe (II) 驱动的还原性脱. 最佳的乳酸:Fe(II) 比率产生协调不和铁,提高对四化碳的反应性.
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:
- 铁 (II) [Fe (II) ] 的协调环境对其还原反应性至关重要.
- 已知乳酸酸可增强微生物脱,但其对Fe (II) 驱动过程的非生物影响尚未研究.
研究的目的:
- 通过改变乳酸:Fe(II) 比率来研究降解脱过程中Fe(II) 的结构-活性关系.
- 确定乳酸盐如何影响非生物Fe(II) 驱动的四化碳的降解脱.
主要方法:
- 乳酸:Fe(II) 比率的系统变化,以研究Fe(II) 协调.
- 碳四化物脱的动力分析.
- 电化学表征和X射线光电子谱学 (XPS) 来评估电子捐赠能力.
主要成果:
- 乳酸盐与Fe (II) 的复合增强了无生物的还原性脱,乳酸盐:Fe (II) 的最佳比率为10:20.
- 降低的Fe (II) 协调数 (从6到4) 和改变的几何形状 (八面体到四面体/正方形平面) 增加了反应性.
- 在最佳比率下,协调不和的Fe ((II) 呈现出最高的脱率 (k1 = 0.26254 min-1).
- 过多的乳酸盐 (>10 mM) 增加了Fe (II) 协调数,降低了反应性.
- 乳酸盐-Fe (II) 复合物在最佳比率下显示出最高的电子捐赠能力.
结论:
- 乳酸盐通过修改Fe (II) 协调环境,显著影响非生物Fe (II) 驱动的还原性脱.
- Fe ((II) 的协调性不和是增强还原性脱的关键.
- 这些发现与了解富含Fe (II) 的地下环境中的污染物降解有关.
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