Facile preparation of COF-LZU1 modified membrane via electrostatic spraying for emerging contaminants treatment in direct contact membrane distillation

膜蒸馏 结垢 化学 膜污染 化学工程 渗透 工业废水处理 接触角 色谱法 Zeta电位 废水 纳米颗粒 环境工程 环境科学 海水淡化 工程类 生物化学
作者
Yan Zhao,Chao Wang,Long‐Fei Ren,Bo Zhang,Jiahui Shao
出处
期刊:Separation and Purification Technology [Elsevier]
卷期号:337: 126411-126411
标识
DOI:10.1016/j.seppur.2024.126411
摘要

Emerging contaminants (ECs) in aqueous ecosystem are becoming a global threat to human beings, which are mainly discharged from industrial wastewater. Direct contact membrane distillation (DCMD) can utilize waste heat to treat industrial wastewater containing ECs, achieving a better balance between removal efficiency and operation cost than other technologies. However, membrane fouling is the major obstacle that impedes DCMD application. Therefore, anti-fouling covalent organic framework COF-LZU1/PVDF composite membranes were prepared via electrostatic spraying and used in DCMD for the first time. Four typical EC compounds (ibuprofen, acesulfame, sulfamethoxazole, and N,N-diethyl-3-methylbenzamide) were selected as targets to investigate the effect of water affinity and charge on membrane fouling. Results showed that COF-1.0 membrane with relatively hydrophilic COF-LZU1 structure exhibited higher permeate flux and salt rejection than commercial PVDF substrate when treating sulfamethoxazole and ibuprofen within pH range of 4–7 and temperature of 40–70 °C. This could be attributed to the weaker hydrophobicity and closer-to-neutral zeta potential of COF-1.0, which weakened the electrostatic and hydrophobic-hydrophobic interactions between membrane and ECs. In addition, the membrane performance comparison in temperature changing DCMD process further showed that COF-1.0 performed better in terms of permeate flux, especially in the gradually decreased temperature condition. Overall, these findings would advance the fundamental understanding and practical application of COF-based membranes in DCMD for ECs treatment.
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