Selective separation of dye/salt mixtures via a tannic acid-polyethyleneimine-modified hollow fiber membrane with high flux†

IF 3.5 4区环境科学与生态学 Q3 ENGINEERING, ENVIRONMENTAL

Environmental Science: Water Research & Technology Pub Date : 2024-07-17 DOI:10.1039/D4EW00277F

Chuanfeng Wang, Qian Chen, Jiapeng Yang and Lina Ge

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Abstract

In this study, a loose nanofiltration (NF) membrane with excellent perm-selectivity was fabricated via co-depositing tannic acid (TA) and polyethyleneimine (PEI) on a PVDF hollow fiber substrate. The performance of the TA-PEI-modified hollow fiber membrane (HFM) was optimized by tuning certain parameters (e.g., TA concentration and co-deposition time). The tailored membrane TA-PEI/PVDF exhibited competitive water permeability (32 L m⁻² h⁻¹ per bar) while maintaining an excellent dye rejection performance (i.e., 99% for CR). Furthermore, it presented low retention for inorganic salts (i.e., 2.3% for NaCl and 6.4% Na₂SO₄). The as-fabricated TA-PEI/PVDF loose NF HFM was proved to have good stability and antifouling performance for treating simulated textile wastewater. In summary, we believe that the as-prepared loose NF HFM has great application prospects for practical wastewater treatment.

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通过具有高通量的单宁酸-聚乙烯亚胺改性中空纤维膜选择性分离染料/盐混合物

本研究通过在聚偏二氟乙烯（PVDF）中空纤维基底上共沉积单宁酸（TA）和聚乙烯亚胺（PEI），制备了一种具有优异过选择性的松散纳滤膜（NF）。通过调整某些参数（如单宁酸浓度和共沉积时间）优化了 TA-PEI 改性中空纤维膜 (HFM) 的性能。定制的 TA-PEI/PVDF 膜具有极佳的透水性（每巴 32 L m-2 h-1），同时保持了出色的染料阻隔性能（即对 CR 的阻隔率为 99%）。此外，它对无机盐的截留率较低（NaCl 为 2.3%，Na2SO4 为 6.4%）。事实证明，制作完成的 TA-PEI/PVDF 松散型 NF HFM 在处理模拟纺织废水时具有良好的稳定性和防污性能。综上所述，我们认为制备的松散型 NF HFM 在实际废水处理中具有广阔的应用前景。

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来源期刊

Environmental Science: Water Research & Technology ENGINEERING, ENVIRONMENTALENVIRONMENTAL SC-ENVIRONMENTAL SCIENCES

CiteScore

8.60

自引率

4.00%

发文量

206

期刊介绍： Environmental Science: Water Research & Technology seeks to showcase high quality research about fundamental science, innovative technologies, and management practices that promote sustainable water.