Adsorção de arsênio(V) pela quitosana ferro - III reticulada Asorption of arsenic (V) by crosslinked iron-III-chitosan

• Main Authors: Tathyane Fagundes, Amanda Wolff Ledra Bachmann, Heloísa Sonálio Overrath Tomaz, Clóvis Antonio Rodrigues
• Format: Article
• Language: English
• Published: Sociedade Brasileira de Química 2008-01-01
• Series: Química Nova
• Subjects: crosslinked iron(III)-chitosan; arsenate; adsorption
• Online Access: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-40422008000600006

<abstract language="eng">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.