Preparation Of Porous Nanofibrous Membrane Via Electrospinning And Its Application In Esterification

One-dimensional continuous nanofibrous membrane is prepared via electrospinning, it functions as excellent supporter for nano-catalyst, which facilitates the recovery of nano-sized material and reduces the mass transfer resistance due to its large interconnected pore size. By introducing NaHC03into dope solution, the nanofibrous membrane achieves mesoporous and macroporous structure, and further improves the specific surface area and pore volume. PFSA cation exchange resin is loaded and anchored on the nanofibrous membrane via dip-coating and heat treatment. After acidification of the composite membrane, it is applied in the esterifiction as acid catalyst.Firstly, influence of the additive NaHCO3to the morphology of nanofibrous membrane was studied. By increasing the amount of additive, the specific surface area and porosity of fibrous membrane was improved significantly, the most probable aperture of pore size distribution moved from less than10nm to50-70nm. Then, by dip-coating and heat treatment method to anchored PFSA resin, the ion exchange ability was0.445mmol/g, and the availability of surface acid site is88.6%. Moreover, the recovery of composite fibrous membrane was above96%. Last, the result of esterification showed the catalytic effect of composite fibrous membrane via dip-coating method is better than blending method. With the increasing amount of catalyst used, the highest conversion achieved90%at1hour. And the kinetics constant reached5.267×10-4m3·kmol-1s-1·g-1, which was superior to commercial one.