Environmentally friendly electrostatically driven self-assembled LDH/GO/PVDF composite membrane for water treatment

In this contribution, an environmentally friendly electrostatically driven self-assembled layered double hydroxide (LDH)/graphene oxide (GO)/polyvinylidene fluoride (PVDF) composite membrane was prepared and evaluated. The composite membrane was prepared based on the electrostatic self-assembly between positively charged LDH and negatively charged GO, then above composite was loaded on the PVDF membrane substrate by vacuum suction filtration. The preparation process does not contain organic matter, which was very environmentally friendly. The properties of the composite membrane were characterized by X-ray diffraction, Fourier transform infrared spectroscopy, scanning electron microscopy and atomic force microscopy . The above characterizations showed that the addition of LDH can increase the layer spacing of the GO sheets, the hydrophilicity of the composite membrane, and the removal rates of Cu 2+ and methylene blue (MB). More importantly, the composite membrane has excellent stability in water and maintains a stable removal rate after long-term filtration. And no significant changes occur even after being left in the ultrasonic bath for a while. In general, the LDH/GO/PVDF composite membrane prepared in this study has a great application value and prospect in the water treatment and opens up a new path in improving membrane performance .