Studies on the surface properties and fabrication method of mixed-matrix membrane for textile industry wastewater treatment

摘要

In this study, the effect of embedding-titanium dioxide (TiO2) nano particles(NPs) into the membrane matrix was studied using PVDF polymer and hydroxyl-functionalized PVDF (PVDF-OH) polymer as the polymer matrix for MMM synthesis via doping method and in-situ particle embedment method. The TiO2 NPs size and its distribution into the membrane matrix were affected by the surface properties and the fabrication method of MMM. The improve TiO2 NPs distribution through in-situ particle embedment method and with the use of PVDF-OH polymer was due to the weak hydrophobic/hydrophilic interactions between TiO2 NPs and polymer solution. The permeate flux of MMMs was greatly enhanced with slight pore enlargement as well as the increasing of membrane hydrophilicity. However, the membrane pore enlargement does not scarify the MB rejection capability of MMMs as the presence of TiO2 NPs created a strong electrostatic repulsion between MB ions and the surface of TiO2 NPs, thus promising a great fouling mitigation effect. PVDF-OH/TiO2 MMM fabricated through in-situ particle embedment method demonstrated the greatest permeate flux (20.22 +/- 1.81 L/m(2) h) and MB rejection (99.45 +/- 0.10%) with better antifouling properties due to larger effective surface area of TiO2 NPs in membrane matrix.