6PPD/6PPD-Q与天然Fe-Mn结节之间的相互作用:吸附和氧化转化的性能和机制
1State Environmental Protection Key Laboratory of Soil Environmental Management and Pollution Control, Nanjing Institute of Environmental Sciences, Ministry of Ecology and Environment of China, Nanjing 210042, China.
Environment international
|April 12, 2025
概括
中的抗氧化剂6PPD (N-(1,3-二甲基) -N'--p-二胺) 和其有毒产物6PPD-胺在铁结节上具有不同的吸附性. 了解这些相互作用对于评估环境风险和制定补救策略至关重要.
科学领域:
- 环境化学环境化学
- 环境科学 环境科学
- 地质化学 地质化学
背景情况:
- 抗氧化剂6PPD及其转化产品6PPD-Q对水生生物有毒.
- 对于它们的环境行为,特别是它们与自然材料的相互作用,我们对它们的理解有限.
研究的目的:
- 对6PPD和6PPD-Q在天然Fe-Mn结节 (NFMN) 上的吸附和转化进行全面的研究.
- 阐明控制它们吸附的机制以及影响这些过程的环境因素.
- 在环境矩阵中确定6PPD-Q形成的新途径.
主要方法:
- 实验性吸附研究 (动力学,异热) 和计算方法的结合.
- 环境因素的研究:温度,pH值和阳离子.
- 吸附机制的分析,包括静电吸引,电荷转移,键和易斯酸复合.
主要成果:
- 6PPD-Q在293K的NFMN上表现出明显更高的吸附能力 (719.2μg·g-1),而不是6PPD (133.8μg·g-1).
- 对于6PPD和6PPD-Q,观察到不同的吸附动力学,异热量和对环境条件的反应.
- 吸附机制有所不同,易斯酸复合在6PPD-Q中占主导地位,而静电吸引和易斯酸复合在6PPD中具有重要意义.
- 在NFMN上,6PPD可以转化为6PPD-Q,由溶解的Mn (III) 促成.
结论:
- NFMN强烈吸附6PPD和6PPD-Q,而6PPD-Q的结合更强大.
- 这项研究揭示了NFMN上的6PPD和6PPD-Q的独特吸附行为和机制.
- 在NFMN上确定了6PPD-Q形成的新途径,这对于环境风险评估和补救至关重要.
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