Adsorção de arsênio(V) pela quitosana ferro - III reticulada

AUTOR(ES)

Fagundes, Tathyane, Bachmann, Amanda Wolff Ledra, Tomaz, Heloísa Sonálio Overrath, Rodrigues, Clóvis Antonio

FONTE

Química Nova

DATA DE PUBLICAÇÃO

2008

RESUMO

The removal of As(V) by a crosslinked iron(III)-chitosan adsorbent was evaluated under various conditions. The adsorption capacity of CH-FeCL was around 54 mg/g of As(V). The kinetics of adsorption obeys a pseudo-first-order model with rate constants equal to 0.022, 0.028, and 0.033 min-1 at 15, 25 and 35 ºC respectively. Adsorption data were well described by the Langmuir model, although they could be modeled also by the Langmuir-Freundlich equation. The maximum adsorption capacity, calculated with the Langmuir model, was 127 mg g-1 of As(V). The inhibition by competing anions is dependant on their kind and valence.

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