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Modified cross-linked polyacrylamide (PAA) with pentaazatetraethylene group (N5) was used as a chelating agent for the removal of Congo red (CR) and Calmagite (CG) as industrial dyes from aqueous solutions. The proposed adsorbent, PAA-N5, was prepared by transamidation reaction in aqueous and non-aqueous media by Hofmann reaction. All experimental conditions including adsorbent dosage, contact time,...
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