Find in Library

Using organic solvent in traditional polymer filtration membrane is easy to cause environ-mental pollution.The silk was uniformly grafted with polyacrylonitrile using zinc chloride aqueous sol-ution as the solvent. The nano-TiO₂ was blended into the mixture and the casting solution was pre-pared. The TiO₂ blended silk fibroin grafted PAN (SF-g-PAN/TiO₂) filtration membrane was pre-pared using water as the coagulation bath. The membrane was characterized by scanning electron micr-oscopy and infrared spectroscopy. The hydrophilic, anti-fouling and mechanical properties of SF-g-PAN membranes with different TiO₂contents were studied. The rejection performance of dyes with different molecular weight by the SF-g-PAN/TiO₂ membrane was investigated. The results show that the mechanical properties of the SF-g-PAN/TiO₂ filtration membranes increase firstly and then dec-rease with the increase of TiO₂ content. When the content of TiO₂ is 1%(mass fraction), the mech-anical and hydrophilic properties of the SF-g-PAN/TiO₂ membrane are the best; the rejection of the dyes whose molecular weight is more than 660 is greater than 96%, with the flux of 80 L/(m²·h) at 0.10 MPa.