Non-isothermal kinetic studies upon sorption of elements from IIA and IIB groups on celluloses modified with azo groups

Non-isothermal kinetic studies performed on sorption of elements from group s IIA and IIB on 1(4'-azobenzylcellulose)-2-naphtol (1) and 4(4'-azobenzyl- cellulose)-1 -hydroxy-2-carboxy-benzene (II) drew the attention upon the co mplexity of the sorption phenomenon. With a view to getting more exact info rmation on such problems, the compensation effect has been followed by the Nikolaev and Gorbachev methods. The existence of the compensation effect co nfirms superposition of chemical and physical sorption, the weight of which is influenced by the nature of both element and sorbent. Chemosorption is favorized by Be(II) on (1) and by Zn(II) and Cd(II) on (II), respectively, on concomitantly increasing the thermostability of the cellulosic support.