期刊
JOURNAL OF MEMBRANE SCIENCE
卷 645, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.memsci.2021.120189
关键词
Nanofiltration membrane; Acid resistance; Dye/NaCl separation; Interfacial polymerization
资金
- National Natural Science Foundation of China [21988102, 51873230, 51625306]
- National Key Research and Development Plan [2019YFA0705800]
- Youth Innovation Promotion Association CAS
- CAS-TWAS Centre of Excellence for Green Technology
In this study, a novel acid-tolerant nanofiltration (NF) membrane was designed and prepared using a new monomer. The resulting membrane showed exceptional structural stability under strong acid conditions and high selectivity for differentiating dyes from saline solution.
Designing and preparing nanofiltration (NF) membrane with distinguished property of acidic tolerance is attractive for handling acidic saline wastewater. In this work, we used a new monomer of 2,2-bis(3-amino-4-hydroxyphenyl)-hexafluoro-propane (bisAPAF) to prepare NF membrane by interfacial polymerization for removing dyes from acidic saline solution. Interestingly, the resulted NF membrane derived from bisAPAF and 1,3,5-trimesyol chloride (TMC) exhibits an exceptional structure stability under strong acid condition. Specifically, after exposed to H2SO4 aqueous solution with concentration of 20% (w/v) for 720 h, the NF maintains a Na2SO4 rejection of similar to 87%, showing little change as compared with the membrane without acidic treatment. In addition, the membrane shows a high selectivity for differentiating Direct Red 23/NaCl or Congo Red/NaCl in the pH range of 2-9, the rejection of dyes maintains at higher than 98% while the NaCl rejection is lower that similar to 10%. The outstanding acid tolerance property of NF membrane makes it a great promise candidate for acid wastewater remediation.
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