低温水等离子体活化和表面接枝DMAE聚氯乙烯中空纤维膜研究

Using low temperature water plasma technology, methacryloxybenzyl dimethyl ammonium chloride (DMAE) monomer was grafted on the surface of the three-channel polyvinyl chloride (PVC) hollow fiber membrane (HFMs) to enhance the membrane's hydrophilic and antibacterial properties. The ATR-FTIR and contact angle analyses revealed that the antibacterial monomers DMAE were grafted onto the HFMs. The hydrophilicity of membranes was greatly improved, resulting in an enhanced permeation of the H₂O plasma-treated membrane was twice as high as that of the original membrane. At the same time, PVC-ir-H₂O membrane (treated by water plasma technology) exhibited excellent anti-protein absorption ability, of which adsorbing capacity for bovine serum albumin (BSA) decreased by 67% and BSA solution flux increased from 7.7 to 40 kg∙m^-2∙h^-1. And the BSA rejection of plasma-treated membrane remained at the same level as that of the original membrane, suggesting the membrane surface damage from plasma irradiation could be neglected. Furthermore, the surface modification on HFMs is relatively uniform along the axial direction of fibers and more environment-friendly. In static antibacterial experiments, the grafted HFMs (PVC-g-DMAE) exhibited bactericidal rate of 100% against gram-negative Escherichia coli (E. coli). In dynamic filtration, the grafted module, PVC-g-DMAE, obtained above 82% bactericidal rate in feed tank. Its E. coli solution flux with 100% rejection was increased by three times as much as that of the original one. This activation-grafting technology exhibited well prospect in application of drinking water treatment membrane module, especially small household water purifiers, arising from the facile operation, low cost, and simple.