Revolution in the Form of Polymeric Adsorbents 1: Porous Hollow-Fiber Membranes and Porous Sheets

Porous hollow-fiber membranes and porous sheets used for microfiltration can be modified into porous adsorbents by radiation-induced graft polymerization. The three-dimensional modification or modification over the entire volume of the porous trunk polymer provides a functional density comparable to that of conventional adsorbents. The ideal adsorption in a flow-through mode is achievable because the time required for a target to diffuse to the functional moiety is much shorter than the residence time of the target solution as it passes through the porous membrane or sheet. The multilayer binding of proteins via multipoints in the polymer brush is applied to the immobilization of an enzyme at a high density, leading to high activity in enzyme reactions such as the quantitative hydrolysis of 4 M urea solution.