和对和酸盐对铁 (水) 氧化物表面吸附的和的影响:CD-MUSIC模型和DFT计算模型
Mengke Jia1, Jie Ma2, Qiongqiong Zhou3
1College of Resources and Environment, Henan Agricultural University, Zhengzhou, Henan, 450002, China.
Chemosphere
|April 19, 2024
概括
和酸盐会影响围石上的吸附. 酸盐增强了的吸附,而通过静电相互作用增强了酸盐的吸附,澄清了土壤的动态.
科学领域:
- 环境化学环境化学
- 土壤科学 土壤科学
- 地质化学 地质化学
背景情况:
- (N) 的可用性和植物吸收受到土壤矿物质表面的关键影响.
- (Ca2+) 和 (PO3-) 在 (NH4+-N) 和酸盐 (NO3-N) 吸附在戈伊 (GT) 上的特定作用仍然不完全理解.
- 阐明这些相互作用对于理解陆地生态系统中固和迁移至关重要.
研究的目的:
- 为了研究Ca2+和PO3-影响NH4和NO3在石表面吸附的机制.
- 确定pH值对这些离子吸附行为的影响.
- 为土壤中的物种化和转化过程提供详细的见解.
主要方法:
- 进行了批量吸附实验,以量化离子吸收.
- 使用电荷分布和多位点复杂化 (CD-MUSIC) 模型来分析吸附机制.
- 密度函数理论 (DFT) 的计算被用来探索表面复杂的配置和能量.
主要成果:
- 石上的NH4+-N吸附在pH8.5时达到峰值,而NO3-N吸附随着pH的增加而下降.
- 2+对NH4吸附的影响最小,但通过静电相互作用增强了NO3吸附.
- PO43-抑制了NO3--N吸附,但促进了NH4+-N吸附,单酸 (SP) 形成了主要的NH4+-N复合体.
结论:
- 2+和PO3-在控制NH-N和NO-N在石上的吸附中发挥着不同的作用.
- 静电相互作用和表面复杂化是影响吸附的关键机制.
- 这些发现为土壤循环和管理策略提供了新的见解.
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