Toward enhancing the separation and antifouling performance of thin-film composite nanofiltration membranes: A novel carbonate-based preoccupation strategy
| Autor: | Weiqiang Wang, Xiaoxiang Cheng, Daliang Xu, Langming Bai, Xuewu Zhu, Xinsheng Luo, Heng Liang, Guibai Li, Zhendong Gan, Xiaobin Tang |
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| Rok vydání: | 2020 |
| Předmět: |
chemistry.chemical_classification
Fouling 02 engineering and technology Permeance 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences 0104 chemical sciences Surfaces Coatings and Films Electronic Optical and Magnetic Materials Biomaterials Biofouling chemistry.chemical_compound Colloid and Surface Chemistry Membrane chemistry Chemical engineering Thin-film composite membrane Calcium bicarbonate Humic acid Nanofiltration 0210 nano-technology |
| Zdroj: | Journal of Colloid and Interface Science. 571:155-165 |
| ISSN: | 0021-9797 |
| DOI: | 10.1016/j.jcis.2020.03.044 |
| Popis: | High-performance nanofiltration (NF) membranes with simultaneously improved antifouling and separation performance are of great significance for environmental water purification. In this work, a high-performance thin-film composite (TFC) NF membrane (TFC-Ca) was constructed through in-situ incorporation of calcium bicarbonate during interfacial reaction. The surface morphology and chemical structure of the TFC-Ca membrane were systematically investigated by FTIR, XPS, AFM, and SEM. The results indicated that the surface characteristics of the pristine NF membrane were greatly changed by the incorporation of calcium bicarbonate. The TFC-Ca membrane exhibited improved hydrophilicity, narrowed pore size, declined negative charge, and increased surface area. Compared to the control membrane, the TFC-Ca membrane possessed a much greater water permeability and higher molecule rejections. For the TFC-Ca membrane, an optimized water permeance of 13.4 ± 0.3 L m−2 h−1 bar−1 with 99.9% Na2SO4 rejection was obtained. Impressively, the TFC-Ca membrane exhibited excellent antifouling performance during 5 cycles of humic acid fouling tests. A satisfactory flux recovery up to 90.0% was achieved after physical cleaning for the optimized membrane. Furthermore, the TFC-Ca membrane also presented superior performance stability when treated with strong acid and chelating agents for 7 days. Overall, this facile preoccupation strategy via in-situ incorporation of calcium bicarbonate allows the fabrication of high-performance TFC membranes with outstanding separation and antifouling properties. |
| Databáze: | OpenAIRE |
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