▎ 摘　　要

In this work, graphene oxide (GO) is functionalized with natural tannic acid macromolecules (GO-TA) and introduced as a novel hydrophilic modifier of thin-film nanocomposite (TFN) membranes. The active layers of the TFN membranes were modified with GO-TA using interfacial polymerization between m-phenylenediamine and trimesoyl chloride monomers. Afterward, the effects of surface modification on the surface hydrophilicity, roughness, morphologies, and surface chemistry of active layer were studied by water contact angle measurement, Fourier transform infrared spectrometer, scanning electron microscopy and atomic force microscopy, respectively. These analyses revealed that the surface characteristics of the TFN membranes were changed remarkably. In addition, the FO performance of the modified membranes was studied using DI water as feed solution and 1 M NaCl as draw solution in FO mode. Compared to the neat TFC (16.1 LMH), the GO-TA embedded TFN membranes present higher water flux (25.7 LMH), which could be ascribed to the variation of morphology, roughness, thickness, and hydrophilicity of the PA thin-film embedment of GO-TA. The satisfactory separation performance suggests more potential of the recently designed TFN-FO membrane for commercial application.