通过加速聚胺降解重复使用寿命终端膜
Luis A Soto-Salcido1, Arto Pihlajamäki1, Mika Mänttäri1
1Department of Separation Science, LUT School of Engineering Science, LUT University, P.O. Box 20, 53851 Lappeenranta, Finland.
Waste management (New York, N.Y.)
|September 1, 2023
概括
生命周期结束的反透膜通过氧化剂和金属离子降解聚胺层,被转化为超过式膜. 这一过程减少了浪费,并允许量身定制的膜特性.
科学领域:
- 材料科学 材料科学 材料科学
- 环境科学 环境科学
- 化学工程是化学工程的重要组成部分.
背景情况:
- 薄膜复合材料 (TFC) 逆透 (RO) 膜在长时间使用后达到使用寿命 (EoL).
- 处理EOL膜有助于环境废物.
- 开发用于重新利用EOL膜的方法对于可持续性至关重要.
研究的目的:
- 为了将EoL TFC RO膜转化为超过式 (UF) 膜.
- 用氧化剂 (NaOCl) 和金属离子 (MgCl2或CaCl2) 来研究聚胺 (PA) 活性层的加速降解.
- 通过量身定制的氧化来控制膜的分子重量切断 (MWCO).
主要方法:
- 在MgCl2或CaCl2的存在下,使用低化物 (NaOCl) 加速降解EoL TFC RO膜.
- 通过纯水透性 (PWP),MgSO4通道和MWCO测量评估PA降解.
- 使用福里埃变换红外光谱 (FTIR),场辐射扫描电子显微镜 (FE-SEM),表面电荷和接触角度测量来描述膜表面变化.
主要成果:
- 添加10mM金属离子显著增强了PA降解,与单独的低化物相比,增加了2.1 (MgCl2) 和3.1 (CaCl2) 倍的PWP.
- FE-SEM证实了PA层的降解,在使用Ca2+时,在12700ppm·h的氧化剂剂量下实现了完全的去除.
- 控制的氧化使得MWCO从大约1200g/mol (未经处理的EoL膜) 到16,10027,100g/mol的范围可以量身定制.
结论:
- 通过加速氧化降解,EoL TFC RO膜可以有效地转化为类似UF的膜.
- 使用金属离子作为催化剂可显著降低所需的氧化剂剂量,并加快降解过程.
- 这种方法提供了一种可持续的方法来减少膜废弃物,通过创建具有可调节性质的增值UF膜.
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