Chromium(III) removal by epoxy-cross-linked poly(ethylenimine) used as gel-coat on silica .2. A new kinetic model

被引:14
作者
Chanda, M [1 ]
Rempel, GL [1 ]
机构
[1] UNIV WATERLOO,DEPT CHEM ENGN,WATERLOO,ON N2L 3G1,CANADA
关键词
D O I
10.1021/ie960815+
中图分类号
TQ [化学工业];
学科分类号
0817 ;
摘要
Regenerable ''gel-coat'' chelating resins with fast sorption kinetics and sorption selectivity have application potential for removal of trace metal ions even in large-scale operations. Poly(ethylenimine) has been gel-coated on high surface area silica and insolubilized by cross-linking with a low molecular weight diepoxide (epoxy equivalent 180 g). The sorption of Cr(III)/SO42- on this gel-coated sorbent under vigorous agitation has characteristics of particle diffusion control (pdc) with homogeneous (gel) diffusion in the resin phase. A new mathematical model is proposed for such sorption in gel-coat resin and solved by applying operator-theoretic methods. The analytical solution so obtained shows good agreement with experimental sorption kinetics for relatively low levels of resin conversion.
引用
收藏
页码:2190 / 2196
页数:7
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