预装长链四元基组合成高效的离子交换树脂,用于消除饮用水中的细菌污染物
Wenrui Zhang1, Chen Ling2, Haosha Dao1
1State Key Laboratory of Pollution Control and Resource Reuse, School of Environment, Nanjing University, Nanjing 210023, China.
Environmental science & technology
|September 3, 2024
概括
一种新的离子交换树脂 (AER) 有效地从饮用水中去除细菌和细胞外DNA. 这种新型树脂表现出比现有方法更清洁,更安全的水的优越性能.
科学领域:
- 环境科学 环境科学
- 水处理 处理水的方法
- 材料科学 材料科学 材料科学
背景情况:
- 饮用水中的细菌污染构成了全球健康风险.
- 传统的离子交换树脂 (AER) 对细菌污染物无效.
- 需要新的处理方法来同时去除细菌和离子污染物.
研究的目的:
- 开发一种具有增强杀菌性质和超快速细胞外DNA (eDNA) 吸附的新型离子交换树脂 (AER).
- 评估新AER对饮用水中的细菌,eDNA和抗生素耐药基因的性能.
- 用理论计算和表面分析阐明树脂有效性背后的机制.
主要方法:
- 合成一种新型的AER (AER6-1) 通过预加载四级基 (QAGs) 与外部的六链,并将QAGs与内部的甲链接.
- 对饮用水中的总细菌,大肠杆菌,P. aeruginosa,eDNA和特定抗生素耐药基因 (ARG) 的性能评估.
- 与商业AER和UV消毒的比较.
- 利用密度函数理论 (DFT),XDLVO理论和X射线光电子谱学 (XPS) 进行机械研究.
主要成果:
- 与其他AER相比,AER6-1表现出明显更快的eDNA吸附 (增加了2.2倍和11.5倍).
- 与AER6-1.一起观察到总细菌,大肠杆菌,P. aeruginosa,eDNA和ARG (mexF,mexB,bacA) 的优异消除.
- 新型树脂保持了与商业AER相比较的离子交换能力.
- 树脂骨架和六-QAGs的结合和疏水力被确定为细菌膜破坏和eDNA吸附的关键因素.
结论:
- 开发的AER6-1表现出异常的杀菌作用和超快的eDNA吸附能力.
- 与现有的AER和紫外线消毒相比,AER6-1提供了一种更优质的方法来从饮用水中去除细菌和阳离子污染物.
- 这项研究扩大了AER的应用范围,并提出了用于同时净化水的有效策略.
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