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Development of a new chitosan/Ni(OH)(2)-based sorbent for boron removal
Demey Cedeño, Hary; Vincent, Thierry; Ruiz Planas, Montserrat; Sastre Requena, Ana María; Guibal, Eric
Universitat Politècnica de Catalunya. Departament d'Enginyeria Química; Universitat Politècnica de Catalunya. SETRI - Grup de Tècniques de Separació i Tractament de Residus Industrials
A new composite containing chitosan (as the encapsulating material) and nickel (II) hydroxide [chiNi(II)] has been manufactured for the removal of boron from aqueous solutions. The biosorbent was characterised using SEM and TGA analyses. Sorption uptake was highly dependent on pH, temperature, initial boron concentration and the mass of the adsorbent. The optimum pH for boron removal was approximately 8. The sorption isotherms were fitted with the Langmuir and the Freundlich models. The Langmuir equation gave the best fit of the experimental data; the maximum adsorption capacity was 61.4 mg g(-1). The uptake kinetics was modelled using the pseudo-second order rate equation. Metal elution was performed using an aqueous solution with the pH set to 12 with NaOH. The recycling of the sorbent was tested, maintaining a removal efficiency and a metal recovery over 90% for five successive sorption/desorption cycles. The effect of temperature was also evaluated, verifying the exothermic nature of the adsorption process. (C) 2014 Elsevier B.V. All rights reserved.
Award-winning
Àrees temàtiques de la UPC::Enginyeria química::Química del medi ambient::Química de l'aigua
Boron
Absorption
Extraction (Chemistry)
Chitosan
Boron
Chitosan
Nickel
Composite
Sorption
New sorbent
ION-EXCHANGE-RESINS
AQUEOUS-SOLUTION
REVERSE-OSMOSIS
CHITOSAN BEADS
ACTIVATED CARBON
GLYCOL FUNCTIONS
WASTE-WATER
FLY-ASH
ADSORPTION
SORPTION
Extracció (Química)
Bor
info:eu-repo/semantics/publishedVersion
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