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通过修改的超临界CO2提取来再生带有PFAS的颗粒活性炭

Tatiana Didenko¹, Almond Lau¹, Anmol L Purohit¹

¹University of Washington, Mechanical Engineering Department, Seattle, WA, 98195, USA.

|December 19, 2024

概括

一种新的超临界二氧化碳提取方法有效地再生污染的颗粒活性炭 (GAC) 和多基物质 (PFAS). 这种工艺可以在不损坏GAC的情况下去除99%以上的酸 (PFOA),从而使吸附剂可重复使用.

科学领域:

环境化学环境化学
化学工程是化学工程的重要组成部分.
材料科学材料科学材料科学

背景情况:

颗粒状活性炭 (GAC) 是废水中和多基物质 (PFAS) 的常见吸附剂.
装有PFAS的消耗GAC需要处置或再生,这给环境和经济带来了挑战.
目前的再生方法可能是能源密集型或无效的,导致吸附剂废弃物.

研究的目的:

开发一种新且高效的方法,用于再生被PFAS污染的废GAC.
通过修改的超临界CO2提取,研究PFAS从GAC中脱离吸附的机制.
评估拟议的再生技术的经济可行性和环境影响.

主要方法:

使用有机溶剂和酸修饰剂进行改性超临界CO2 (scCO2) 提取.
采用连续流反应堆在温和温度下再生废 GAC (约. 在100°C).
分析了PFAS脱附效率和处理后GAC特性变化.

主要成果:

在60分钟内从GAC中达到>99%的 perfluorooctanoic acid (PFOA) 脱落. 在60分钟内.
证明了温和的提取条件可以防止挥发性有机的形成.
在再生后,GAC吸附剂特性没有显著变化.
确定了共同溶剂/scCO2的可混合性和反向的疏水/静电相互作用推动了有效的PFAS去除.

结论:

改性scCO2提取提供了一种有效和经济可行的方法,用于再生含PFAS的GAC.
该过程使吸附剂可重复使用,并产生适合进一步处理的缩PFAS废水.
这种方法解决了使用过的GAC管理的挑战,并促进了水处理中的循环经济.

关键词:

在GAC再生过程中,颗粒状活化碳是什么颗粒状活化碳修改的超临界流体提取方法在PFAS中,有很多方法.这就是PFOA的PFOA.超临界的CO2

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