Preparation of high-flux PSF/GO loose nanofiltration hollow fiber membranes with dense-loose structure for treating textile wastewater

In this work, we reported the fabrication of novel loose nanofiltration (NF) hollow fiber membranes with dense-loose structure by one-step non-solvent induced phase separation (NIPS) method without post treatment. We selected air and graphene oxide (GO) as bore fluid and additive, respectively. The effects of air and GO on the properties of the prepared membranes were investigated based on field emission scanning electron microscope (SEM) image, pore size distribution, differential scanning calorimetry (DSC), Raman spectra, X-ray photoelectron spectrometer (XPS), water contact angle, zeta potential, mechanical strength, permeability, and rejection. The prepared membranes presented a long-term stability with a high dye rejection of 99.9% for treating the simulated textile wastewater. Meanwhile, the flux was much higher than those of the other reported membranes. Therefore, our prepared membranes showed a great potential for treating textile wastewater.