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通过具有不同孔径大小的共价有机框架从水中去除典型的PFAS

Wei Wang¹, Ye Jia², Shuangxi Zhou²

¹State Key Laboratory of Plateau Ecology and Agriculture, Qinghai University, Xi'ning, Qinghai Province 810016, China; School of Environment, Beijing Key Laboratory for Emerging Organic Contaminants Control, State Key Joint Laboratory of Environment Simulation and Pollution Control (SKLESPC), Tsinghua University, Beijing 100084, China.

Journal of hazardous materials

|September 14, 2023

概括

优化吸附剂孔径大小是去除和多醇基物质 (PFAS) 的关键. 孔径大小为2.5-4.0倍的PFAS分子大小的共价有机框架 (COF) 显示出最佳吸附,纳米泡增强了去除.

科学领域:

环境化学环境化学
材料科学材料科学材料科学
水处理处理水的方法

背景情况:

吸附是从水中去除和多基物质 (PFAS) 的关键方法.
通过多孔吸附剂去除PFAS的有效性受到毛孔大小的显著影响,但这种关系尚不清楚.
聚合有机框架 (COF) 提供可调节的孔径,使它们成为PFAS吸附的有希望的候选者.

研究的目的:

调查共价有机框架 (COF) 的孔径与和多醇基物质 (PFAS) 的吸附效率之间的相关性.
为了确定COF的最佳孔径范围,以有效地去除PFAS.
探索纳米泡对PFAS吸附在COFs上的影响.

主要方法:

合成五个有规律的共价有机框架 (COF),具有明显的,可控的孔径.
吸附实验,以评估在不同孔径的COF中PFAS去除效率.
空气和脱气处理,研究纳米气泡在PFAS吸附中的作用.

主要成果:

孔径为PFAS分子大小的2.5到4.0倍的COF表现出最有效的吸附.
过小和过大的孔径都阻碍了PFAS吸附,原因是扩散限制和结合弱.
在疏水性COF上形成的纳米泡被确定为PFAS吸附的重要因素,偏好长链PFAS.

结论:

为了获得最佳的吸附效率,COF的孔径必须与PFAS的分子尺寸仔细匹配.
纳米泡的形成为增强COF上的PFAS吸附提供了一种新且有效的机制.
这项研究为设计先进的COF材料提供了关键的见解,以有效地从受污染的水源中修复PFAS.

关键词:

吸附机制是一种吸附机制.共价有机框架是共价有机框架.这些是纳米泡.在PFAS的长度上.毛孔的大小毛孔大小

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