Abstract
Low-cost adsorbents, synthesized by pyrolysis of waste rubber (CR) and activated with KOH (CRA), have shown the high removal ability of $${}^{{99{\text{m}}}}{\text{TcO}}_{4}^{ - }$$ from aqueous solutions in wide range of pHs (2–10) with fast adsorption rate. The Langmuir and Freundlich models suggests monolayer and multilayer adsorption of $${}^{{99{\text{m}}}}{\text{TcO}}_{4}^{ - }$$ onto CR and CRA surface, respectively. The removal mechanism of $${}^{{99{\text{m}}}}{\text{TcO}}_{4}^{ - }$$ from solution occurs by replacement with OH− from surface groups (phenolic and/or accompanying carboxylic) of CR and CRA indicating anion exchange mechanism.
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