Chitosan-sodium alginate multilayer membrane developed by Fe@WO nanoparticles: Photocatalytic removal of hexavalent chromium.

The WO nanostructures were modified by doping with iron and then the polyethersulfone (PES) ultrafiltration (UF) membrane was developed using prepared Fe-doped WO photocatalytic nanoparticles via layer by layer technology. According to UV-vis diffuse reflectance spectroscopy (UV-vis/DRS) characterization, the photocatalytic activity of WO nanoparticles could be improved by doping with Fe impurity. The prepared membranes were characterized by X-ray diffraction (XRD), atomic force microscopy (AFM), field emission scanning electron microscopy (FESEM), energy dispersive X-ray spectroscopy (EDX) and contact angle analyzer.

Hexavalent chromium removal by multilayer membrane assisted by photocatalytic couple nanoparticle from both permeate and retentate.

In this study, a novel photocatalytic thin film nanocomposite (TFC) membrane was prepared for removal of hexavalent chromium (Cr(VI)) from aqueous solution. In this regards, a TFC membrane was modified by a layer of chitosan as an adsorbent and then was coated with a layer of synthesized photocatalytic nanoscale zerovalent iron@titanium dioxide (nZVI@TiO) nanoparticles via layer-by-layer (LBL) technology. Prepared membranes were characterized by X-ray diffraction (XRD), energy dispersive X-ray spectroscopy (EDX), field emission scanning electron microscopy (FESEM), atomic force microscopy (AFM) and contact angle analysis.