“…On the other hand, for the SiO2-Psf membrane contact angle (without GO) the contact angle is 71.13°, approximately the same as the GO/SiO2-Psf membrane. This indicates that the membrane is hydrophilic or slightly water-loving (contact angle () (0°90°) [32,33]. Furthermore, a small contact angle generally results in better hydrophilicity, increased water flux, and resistance to Impurities [34].…”