Designing zeolites for the removal of aqueous PFAS: a perspective

Industrial Chemistry & Materials Pub Date : 2023-10-20 DOI:10.1039/D3IM00091E

Charles A. Ponge, David R. Corbin, Clarice M. Sabolay and Mark B. Shiflett

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Abstract

Zeolites possess unique sieving properties that offer a high selectivity for removing pollutants, such as per- and polyfluoroalkyl substances (PFAS). However, there are limited studies examining the efficacy of zeolites as PFAS sorbents. Previous literature explores the effects of certain frameworks and the silica alumina ratio (SAR), and only one study has shown the effect of silanol defects on the hydrophobicity of the adsorbent. Since most zeolites are synthesized in hydroxide media, this leads to formation of silanol defects, which increase hydrophilicity with a greater effect than the inclusion of non-Si T atoms. It is critical that specific characterizations be performed to demonstrate the specific effects of different properties of the zeolites. In particular, synthesis, modification, and/or repair in fluoride media can be used to increase the hydrophobicity of zeolites by reducing silanol defects, and increasing Lewis acidity.

Keywords: Zeolites; Aqueous adsorption; PFAS; Hydrophobic interaction; Silica–alumina ratio.

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设计用于去除水体中全氟辛烷磺酸的沸石：展望

沸石具有独特的筛分特性，可提供去除污染物（如全氟和多氟烷基物质）的高选择性。然而，对沸石作为全氟辛烷磺酸吸附剂的功效进行的研究还很有限。以往的文献探讨了某些框架和硅铝比（SAR）的影响，只有一项研究显示了硅醇缺陷对吸附剂疏水性的影响。由于大多数沸石都是在氢氧化物介质中合成的，这会导致硅醇缺陷的形成，而硅醇缺陷比非硅 T 原子的加入更能增加亲水性。关键是要进行具体的表征，以证明沸石不同性质的具体影响。特别是在氟介质中进行合成、改性和/或修复，可以通过减少硅醇缺陷和增加路易斯酸度来增加沸石的疏水性：沸石；水吸附；PFAS；疏水作用；硅铝比。

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