在水沉积物系统中的粘土矿物质上溶解有机物和的微分吸附
Menghan Yu1,2,3, Zongle Gan1,2,3, Wenjun Zhang4
1Engineering Research Center of Nano-Geomaterials of Ministry of Education, China University of Geosciences, Wuhan 430074, China.
Environmental science & technology
|January 18, 2024
概括
沉积物类型显著影响淡水中的和碳循环. 铁蒙莫里隆尼特增强了吸附,增加了有机碳与酸盐的比率,而蒙莫里隆尼特则相反.
科学领域:
- 环境科学 环境科学
- 地质化学 地质化学
- 生物地质化学生物地质化学
背景情况:
- 湖泊沉积物在 (P) 和碳 (C) 的生态化学循环中发挥着至关重要的作用,影响流水质量.
- 沉积物类型对P和C循环的特定影响仍然不完全理解.
研究的目的:
- 调查蒙莫里隆石 (Mt) 中不同层间子如何影响溶解有机物 (DOM) 和P.的吸附.
- 阐明蒙莫里隆石在淡水系统中调节有机碳与酸盐 (OC/P) 比率中的作用.
主要方法:
- 研究了蒙莫里隆石 (Mt) 与DOM和P上的Na+,Ca2+和Fe3+介层离子的吸附行为.
- 利用现场原子力显微镜和高分辨率质谱分析分子分离和吸附过程.
主要成果:
- Fe-Mt的P吸附能力比Ca-Mt高3.2倍,但DOM吸附能力比Ca-Mt低1/3 .
- 在Fe-Mt占主导的水中,OC/P比率增加,而在Ca-Mt占主导的水中,OC/P比率下降.
- DOM在山上抑制了P核化;P通过竞争性吸附影响了DOM的结合能量,控制了界面P/DOM动态.
结论:
- 粘土矿物质,如蒙莫里隆石,在淡水系统中充当重要的营养沉积物.
- 粘土矿物质中介层酸子的类型对P和C循环产生了重大影响.
- 这些发现为通过粘土矿物相互作用控制P和C动态提供了管理水质的新策略.
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