| In recent years, to prepare nanocomposite membrane with high performance through the incorporation of nanomaterials has been a new research interest in membrane technology. Polyaniline (PANI) is a kind of conducting polymers. Since its doping/dedoping state can be controlled on the molecular level, PANI will be widely applied in future membrane technology. Our group have innovatively prepared the PANI nanofiber composite membrane. This paper is one part of the research, which mainly concerns about the membrane surface modification technology, including two-step insitu polymerization and thin film composite (TFC) method.PANI/PS nanocomposite membrane was prepared through the two-step insitu polymerization. This method separats adsorbtion process and polymerization process of the insitu polyerization. PANI nanofibers could grow homogeneously on PS membrane to form PANI/PS nanocomposite membrane by controlling the type and concentration of doping acid, the concentration of oxidant and reaction time. Compared with the PS membrane, the nanocomposite membrane had better hydrophilic property, higher rejection performance, higher anti-fouling property, and certain pH sensitivity. With the extension of reaction time, the nanocomposite membrane showed lower pure water flux, higher PEG35K rejection.PANI-polyvinyl alcohol (PVA)/PS TFC membrane was prepared through the TFC method. This method is to cover the PANI nanofiber and PVA blending on the surface of the PS membrane, then dry to form TFC membrane. By controlling the concentration of PVA, cross link degree (Cld) and the content of PANI nanofiber, PANI-PVA/PS TFC membranes with high performance were prepared. Compared with the pure PVA/PS TFC membrane, the PANI-PVA/PS TFC membrane had better hydrophilic property and higher flux. With the increasing content of PANI nanofiber, the TFC membrane showed higher pure water flux, lower PEG35K rejection.This paper provides new ideas and methods to apply nano-materials in membrane technology.
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