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Cellulose nanowhiskers improve the methylene blue adsorption capacity of chitosan-g-poly(acrylic acid) hydrogel

Melo, Bruno C. ; Paulino, Francisco A.A. ; Cardoso, Varneir A. ; Pereira, Antonio G.B. ; Fajardo, André R. ; Rodrigues, Francisco H.A.

Carbohydrate polymers, 2018-02, Vol.181, p.358-367 [Periódico revisado por pares]

England: Elsevier Ltd

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  • Título:
    Cellulose nanowhiskers improve the methylene blue adsorption capacity of chitosan-g-poly(acrylic acid) hydrogel
  • Autor: Melo, Bruno C. ; Paulino, Francisco A.A. ; Cardoso, Varneir A. ; Pereira, Antonio G.B. ; Fajardo, André R. ; Rodrigues, Francisco H.A.
  • Assuntos: Adsorption ; Cellulose nanowhiskers ; Chitosan ; Hydrogel composite ; Methylene blue ; Wastewater treatment
  • É parte de: Carbohydrate polymers, 2018-02, Vol.181, p.358-367
  • Notas: ObjectType-Article-1
    SourceType-Scholarly Journals-1
    ObjectType-Feature-2
    content type line 23
  • Descrição: [Display omitted] •Cellulose nanowhiskers were used to enhance the adsorption capacity of chitosan hydrogel.•The resulting composite showed improved adsorption capacity towards methylene blue (MB).•The highest MB adsorption (1968mg/g) was observed for the composite at 5w/w-% nanowhiskers.•Desorption experiments showed that 75% of loaded-MB could be recovered at pH 1 solution.•The post-utilized composite can be recycled and reused (5 times) with 2% of efficiency loss. Cellulose nanowhiskers (CNWs, 90% crystalline) were used to enhance the adsorption capacity of chitosan-g-poly(acrylic acid) hydrogel. The composites up to 20w/w-% CNWs showed improved adsorption capacity towards methylene blue (MB) as compared to the pristine hydrogel. At 5w/w-% CNWs the composite presented the highest adsorption capacity (1968mg/g). The maximum removal of MB (>98% of initial concentration 2000mg/L) was achieved quickly (60min) at room temperature, pH 6, and at low ionic strength (0.1M). Adsorption mechanism was explained with the Langmuir type I model suggesting the formation of a MB monolayer on the adsorbent surface. The interaction between the adsorbent and MB molecules was explained by chemisorption, as suggested by the pseudo-second-order kinetic model. Desorption experiments showed that 75% of loaded-MB could be recovered from the adsorbent by its immersion in a pH 1 solution. Additional experiments showed the post-utilized composite could be regenerated and reused for at least 5 consecutive adsorption/desorption cycles with minimum efficiency loss (∼2%).
  • Editor: England: Elsevier Ltd
  • Idioma: Inglês
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