Abstract
Membrane fouling, including the accumulation of bacteria, oil and dyes on the membrane surface, could reduce the permeability and selectivity of the separation membrane. This work proposes a “double-defense” barrier, integrating the biological catalysis and hydrogel coating on the separation membrane. The first defense barrier was designed by coating polyvinyl alcohol, sodium carboxymethylcellulose and tannic acid hydrogel paint on the membrane surface, forming the hydrogel coating to repel the oil and bacteria adhesion. The second defense barrier was formed with polydopamine as the “bridge” to anchoring the encapsulated laccase, efficiently degrading the dye molecule of adhesion on the membrane surface. Meanwhile, the bimetallic metal–organic frameworks-based mixed matrix membranes were prepared as the dye/salt separation membrane substrate. Experimental results showed that the “double-defense” barrier endowed the separation membrane with comprehensive anti-fouling properties. Meanwhile, the separation membrane exhibited an outstanding selectivity for dye and salt separation (dye removal > 98 %, NaCl removal < 15 %) with a high flux (137.9 Lm-2h-1bar−1) and excellent stability for long-term separation. Besides, the separation membrane exhibited a significant inhibitory effect on bacteria growth. The separation membrane with a “double-defense” barrier showed promising potential for the dyeing wastewater treatment.
Published Version
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