Abstract
Dyes disposal in water has become a global concern due to its toxicity to humans and the aquatic ecosystem. Membrane separation processes can be an option to deal with this environmental issue. In this study, graphene oxide was functionalized with tannic acid (TA-GO) to coat the surface of a microfiltration membrane (MFTA-GO). The ATR-FTIR, SEM, and WCA techniques confirmed that the membrane surface was successfully modified. MFTA-GO obtained excellent removal rates for the twilight yellow and safranine orange dyes, maintaining the water flux recovery at high levels (> 66%). These results were superior to those obtained by the pure membrane and the membrane modified solely with GO. They can be attributed to the higher compatibility of TA-GO with the membrane surface. In addition, MFTA-GO may be reused in consecutive cycles, demonstrating an operational advantage. The proposed process can be an alternative to improve the characteristics of microfiltration membranes used for dye removal from contaminated water.
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