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Hydrophilic nanofiltration membranes with self-polymerized and strongly-adhered polydopamine as separating layer

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Abstract

Inspired by the self-polymerization and strong adhesion characteristics of dopamine in aqueous conditions, a novel hydrophilic nanofiltration (NF) membrane was fabricated by simply dipping polysulfone (PSf) ultrafiltration (UF) substrate in dopamine solution. The changes in surface chemical composition and morphology of membranes were determined by Fourier transform infrared spectroscopy (FTIR-ATR), X-ray photoelectron spectroscopy (XPS), scanning electron microscopy (SEM) and atomic force microscopy (AFM). The experimental results indicated that the self-polymerized dopamine formed an ultrathin and defect-free barrier layer on the PSf UF membrane. The surface hydrophilicity of membranes was evaluated through water contact angle measurements. It was found that membrane hydrophilicity was significantly improved after coating a polydopamine (pDA) layer, especially after double coating. The dyes filtration experiments showed that the double-coated membranes were able to reject completely the dyes of brilliant blue, congo red and methyl orange with a pure water flux of 83.7 L/(m2·h) under 0.6 MPa. The zeta potential determination revealed the positively-charged characteristics of PSf/pDA composite membrane in NF process. The salt rejection of the membranes was characterized by 0.01 mmol/L of salts filtration experiment. It was demonstrated that the salts rejections followed the sequence: NaCl < Na2SO4 < MgSO4 < MgCl2 < CaCl2, and the rejection to CaCl2 reached 68.7%. Moreover, the composite NF membranes showed a good stability in water-phase filtration process.

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Correspondence to Li-ping Zhu  (朱利平).

Additional information

This work was financially supported by the National Natural Science Foundation of China (No. 50803054), Zhejiang Provincial Nature Science Foundation of China (No. Y4100204)

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Li, Xl., Zhu, Lp., Jiang, Jh. et al. Hydrophilic nanofiltration membranes with self-polymerized and strongly-adhered polydopamine as separating layer. Chin J Polym Sci 30, 152–163 (2012). https://doi.org/10.1007/s10118-012-1107-5

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  • DOI: https://doi.org/10.1007/s10118-012-1107-5

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