A non-Isothermal kinetics study upon the Pb(II) soprtion on chemically-modified celluloses

摘要

A non-isothermal kinetic study - based on thermogravimetric data - was performed on the sorption of Pb(II) on three celluloses chemically modified with azo and thiourea groups: 1(4'-azobenzylcellulose)-1,3-dihydroxybenzene (I), 4(4'-azobenzylcellulose)-1-hydroxy-2-carboxylbenzene (II) and 4(benzylcellulose)-phenylthiocarbamoilamine (III). The kinetic parameters and the compensation effect evidence that Pb(II) retention on the sorbents considered in the study occurs predominantly through chemosoption. The following order of sorbents' selectivity may be therefore established: II > I > III.