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用于从水中结PFAS的Ag交换Y热质的高温行为

Maura Mancinelli¹, Annalisa Martucci¹, Gian Marco Salani¹

¹Department of Physics and Earth Sciences, University of Ferrara, Via Saragat 1, I-44121, Ferrara, Italy. mrs@unife.it.

Physical chemistry chemical physics : PCCP

|July 18, 2023

概括

热再生的Ag交换的Y热氧化物有效地去除和多化基物质 (PFAS),包括PFOA和PFOS. 热带石结构保持完整,允许在水处理中进行多个PFAS吸附和再生周期.

科学领域:

环境化学环境化学
材料科学材料科学材料科学
吸附科学吸附科学

背景情况:

和多化基物质 (PFAS) 是由于其稳定性和独特性质而引起广泛环境关注的持久性人为化合物.
交换Ag的Y焦化被研究为从水中去除PFAS的潜在吸附剂.
了解加载热石的热再生行为对于可持续的水处理应用至关重要.

研究的目的:

为了研究充满 perfluorooctanoic 酸 (PFOA) 和 perfluorooctane 硫酸盐 (PFOS) 的 Ag 交换 Y 热质的热行为.
阐明在热再生过程中晶体结构,脱水和脱水过程之间的关系.
为了评估热处理以去除PFAS后的热带石的结构完整性和可重复使用性.

主要方法:

碳分析的元素和同位素丰度.
热分析 (TGA/DSC). 热分析 (TGA/DSC). 热分析 (TGA/DSC). 热分析 (TGA/DSC). 热分析 (TGA/DSC). 热分析 (TGA/DSC). 热分析 (TGA/DSC). 热分析 (TGA/DSC). 热分析 (TGA/DSC). 热分析 (TGA/DSC). 热分析 (TGA/DSC). 热分析 (TGA/DSC)
在现场高温同步X射线粉体衍射与瑞特维尔德精细化.

主要成果:

在550-650°C范围内,PFAS有效地从Ag交换的Y热中去除,这与PFOA和PFOS的热降解温度相吻合.
在整个吸附-脱附循环中,石的结晶性被保留下来.
热再生诱导银离子迁移和框架几何变化,但通道尺寸仍然与原始材料相比.

结论:

热再生是一种可行的方法,可以恢复 Ag 交换的 Y 热带石对 PFAS 的吸附能力.
石的结构稳定性允许其在多个水处理周期中被潜在地重复使用.
再生和重新加载的热石显示了可比的PFAS再吸附,提供了成本效益高的水处理解决方案.

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