Abstract
An amphoteric ion exchanger containing acidic and basic groups is prepared by chemical treatment of scrap tires by reaction with Sulphuric acid then the sulphonated sample aminated by ethylenediamine at different conditions in order to choose the best product within the thermal range of 120-170 ºC. The best conditions to obtain an amphoteric ion exchanger were at 150 ºC, for a period of 12 h, and mass ratio 1:1 of sulphonated sample to ethylenediamine. The maximum acidic and basic capacities were found as 2.40 and 2.55 meq g-1 of the selected ion exchanger respectively, wet and dry thermal stability process of the selected exchanger were also investigated.
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