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Partially carboxymethylated and partially cross-linked surface of chitosan versus the adsorptive removal of dyes and divalent metal ions
- Doshi, Bhairavi, Ayati, Ali, Tanhaei, Bahareh, Repo, Eveliina, Sillanpää, Mika
- Carbohydrate polymers 2018 v.197 pp. 586-597
- adsorbents, adsorption, aqueous solutions, chemical reactions, chitosan, crosslinking, divalent metals, dyes, effluents, heavy metals, industrial wastes, leaching, metal ions, models, sodium, sorption isotherms, toxicity, wastewater
- Industrial wastes and their effluents containing dyes and heavy metals are a tremendous threat to the environment, and to treat these toxic waste streams, effective and environmentally benign methods are needed. In this study, NaCS-GL was used as an effective adsorbent, for the removal of dyes and metal ions from their aqueous solution. The presence of carboxylate groups on the NaCS-GL surface has altered the protonation of amino groups. The adsorption kinetics of dyes on NaCS-GL was initially controlled by the film diffusion or chemical reaction after which the intra-particle or pore diffusion started to govern the rate. Leaching of sodium ion confirmed the crosslinking of two carboxylate groups of NaCS-GL with the metal ions. Modeling of the adsorption isotherms revealed that the different active surface sites of NaCS-GL were involved in the adsorption of dyes and metals, suggesting the simultaneous removal of these components from the wastewater.