Elsevier

Journal of Membrane Science

Volume 85, Issue 1, 28 October 1993, Pages 21-28
Journal of Membrane Science

Comparison of BSA adsorption and Fe sorption to the diol group and tannin immobilized onto a microfiltration membrane

https://doi.org/10.1016/0376-7388(93)85003-FGet rights and content

Abstract

A diol group and tannin were immobilized on a polyethylene microfiltration (MF) membrane by radiation-induced grafting of glycidyl methacrylate (GMA) and subsequent chemical modifications. A quantitative hydrolysis of the GMA-grafted membrane with sulfuric acid provided a diol group density of 7.7 mol per kg of the starting MF membrane. Coupling of the GMA-grafted membrane with tannin resulted in a 4% molar conversion of the epoxide group. Breakthrough curves of bovine serum albumin (BSA) and ferrous ions during permeation of their solution across the modified membrane were compared. The breakthrough curves resulting from BSA adsorption onto the grafted polymer branches containing the diol group and tannin were insensitive to the residence time of the solution across the membranes, whereas, the breakthrough curve of the ferrous ions was dependent on the residence time because of their lower binding rate to the tannin immobilized on the grafted polymer branches.

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    After the reaction period, the product was filtered, washed several times with distilled water. The third step is the conversion of remaining epoxy groups into diol group by reaction with 0.5 M H2SO4 for 2 h at 80 °C [13]. The process was carried out to reduce non-selective adsorption.

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