Sheshmani, S., Ashori, A.*, & Hasanzadeh, S.

International Journal of Biological Macromolecules 68: 218–224.

2014

tMagnetic graphene/chitosan (MGCh) nanocomposite was fabricated through a facile chemical route andits application as a new adsorbent for Acid Orange 7 (AO7) removal was also investigated. After synthesis,the full characterization with various techniques (FTIR, XRD, VSM, and SEM) was achieved revealingmany possible interactions/forces of dye–composite system. The results showed that, benefiting fromthe surface property of graphene oxide, the abundant amino and hydroxyl functional groups of chitosan,and from the magnetic property of Fe3O4, the adsorbent possesses quite a good and versatile adsorptioncapacity to the dye under investigation, and can be easily and rapidly extracted from water by magneticattraction. The maximum absorption capacity was reached at initial pH 3 and 120 min contact time.The batch adsorption experiments showed that the adsorption of the AO7 is considerably dependenton pH of milieu, amount of adsorbent, and contact time. The adsorption kinetics and isotherms wereinvestigated to indicate that the kinetic and equilibrium adsorption were well-described by pseudo-firstorder kinetic and Langmuir isotherm model, respectively. The adsorption behavior suggested that theadsorbent surface was homogeneous in nature. The study suggests that the MGCh is a promising nanoadsorbent for removal of anionic azo dyes from aqueous solution.