离子交换树脂与不同四级氨基功能组的结构选择性关系,用于从化废水中高度选择性地去除PFAS
Xiangzhe Jiang1, Yihua Luo1, Shuang Mu1
1State Key Joint Laboratory of Environment Simulation and Pollution Control (SKLESPC), Beijing Key Laboratory for Emerging Organic Contaminants Control, School of Environment, Tsinghua University, Beijing 100084, China.
Water research
|November 10, 2024
概括
具有长链氨基群的新型离子交换树脂 (AER) 显示出在废水中去除基和多基物质 (PFAS) 的选择性提高. 这些新的AER改善了特定PFAS化合物的吸附,提供了更好的废水处理解决方案.
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:
- 阳离子交换树脂 (AER) 吸附对于从废水中去除和多基物质 (PFAS) 是至关重要的.
- 现有的AER缺乏对某些PFAS的选择性,例如 perfluorinated carboxylic acid (PFCA) 和6:2甲硫酸盐 (6:2 FTS),阻碍了有效的治疗.
- 在AER上吸附PFAS的结构选择性关系仍然不太清楚.
研究的目的:
- 开发具有增强PFAS吸附选择性的新型凝AER.
- 对于典型的PFAS来说,研究AER与不同四级氨基函数组的结构选择性关系.
- 阐明促进增强PFAS吸附的相互作用机制.
主要方法:
- 合成具有长链氨基基组的新型凝AER.
- 制备和表征16种具有不同四级胺功能组的AER.
- 评估吸附选择性使用选择性系数和吸附能量七典型的PFAS.
- 密度函数理论 (DFT) 计算来分析吸附相互作用.
主要成果:
- 与商业AER相比,新型AER对6:2 FTS的吸附选择性是商业AER的3.3-5.1倍.
- 化废水中6:2 FTS的吸附能力是新AER的2.1倍,比商业PFA694E的2倍.
- 对于具有不同四级氨基基组的AERs,建立了一个清晰的吸附选择性顺序,其中AER- 12-1-1) 显示最高.
- DFT的计算证实了长链氨基团通过非静电和静电相互作用来增强吸附选择性.
结论:
- 具有长链氨基群的新型凝AER显著提高了特定PFAS的吸附选择性,特别是6:2 FTS.
- 该研究确定了AER上PFAS吸附的定量结构-选择性关系,指导了未来的吸附剂设计.
- 这些发现为开发高效吸附剂提供了基础,用于从工业废水中全面清除PFAS.
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