Adsorption Behavior of Lysozyme by Sponge-like Materials Based on Electrospinning

A highly carboxylated sponge monolithic adsorbent material (PVA/BTCA porous material) was prepared using SiO2 nanofibers as a three-dimensional structural rigid support framework and an esterified cross-linking reactant of poly(vinyl alcohol) (PVA)/butane tetracarboxylic acid (BTCA) as a functional organic binder. As a kind of adsorption material, it is proven that PVA/BTCA material has good structural stability under water by underwater cyclic compression test. The highly carboxylated and high porosity of the PVA/BTCA porous material provided the basis for protein adsorption, which could selectively adsorb positively charged proteins. Using lysozyme as the main model protein, the maximum adsorption of PVA/BTCA porous material for lysozyme at pH=7 was 1342.3 mg/g. The isothermal adsorption model of PVA/BTCA porous material for the adsorption of lysozyme is in close agreement with the Freundlich adsorption model. The excellent mechanical stability and chemical structural stability confer reusability to the PVA/BTCA porous material. This work is expected to provide a new separation material for protein separation. [GRAPHICS] .