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Erschienen in: Cellulose 3/2014

01.06.2014 | Original Paper

Cellulose nanocrystals as promising adsorbents for the removal of cationic dyes

verfasst von: Rasim Batmaz, Nishil Mohammed, Masuduz Zaman, Gagan Minhas, Richard M. Berry, Kam C. Tam

Erschienen in: Cellulose | Ausgabe 3/2014

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Abstract

Cellulose nanocrystals (CNCs) prepared from cellulose fibre via sulfuric acid hydrolysis was used as an adsorbent for the removal of methylene blue (MB) from aqueous solution. The effects of pH, adsorbent dosage, temperature, ionic strength, initial dye concentration were studied to optimize the conditions for the maximum adsorption of dye. Adsorption equilibrium data was fitted to both Langmuir and Freundlich isotherm models, where the Langmuir model better described the adsorption process. The maximum adsorption capacity was 118 mg dye/g CNC at 25 °C and pH 9. Calculated thermodynamic parameters, such as free energy change (ΔG = −20.8 kJ/mol), enthalpy change (ΔH = −3.45 kJ/mol), and entropy change (ΔS = 0.58 kJ/mol K) indicates that MB adsorption on CNCs is a spontaneous exothermic process. Tunability of the adsorption capacity by surface modification of CNCs was shown by oxidizing the primary hydroxyl groups on the CNC surface with TEMPO reagent and the adsorption capacity was increased from 118 to 769 mg dye/g CNC.

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Metadaten
Titel
Cellulose nanocrystals as promising adsorbents for the removal of cationic dyes
verfasst von
Rasim Batmaz
Nishil Mohammed
Masuduz Zaman
Gagan Minhas
Richard M. Berry
Kam C. Tam
Publikationsdatum
01.06.2014
Verlag
Springer Netherlands
Erschienen in
Cellulose / Ausgabe 3/2014
Print ISSN: 0969-0239
Elektronische ISSN: 1572-882X
DOI
https://doi.org/10.1007/s10570-014-0168-8

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