Adsorção de arsênio(V) pelo compósito magnético hidrotalcita: óxido de ferro

• Main Authors: Thiago Vinícius Toledo, Carlos Roberto Bellato, Rafael Henrique do Rosário, José de Oliveira Marques Neto
• Format: Article
• Language: English
• Published: Sociedade Brasileira de Química 2011-01-01
• Series: Química Nova
• Subjects: hidrotalcite - iron oxide composite; arsenate; adsorption
• Online Access: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-40422011000400002&lng=en&tlng=en

In this work, hydrotalcite, a layered double hydroxide, had its adsorption and ion exchange properties combined with the magnetic properties of iron oxide to produce a magnetic adsorbent, HT-Fe. The removal of As(V) by a HT-Fe adsorbent was evaluated under various conditions. The Kinetic process was well described by a pseudo-second order rate model. The maximum adsorption capacity, calculated with the Langmuir model showed to be dependent on pH, reaching values of 24.09, 10.19 and 7.44 mg g-1, respectively, for pH values of 4.0, 7.0 and 9.0. The inhibition by competition of anions is dependent on the type of ionic species.