Abstract:

The adsorption features of multi-walled carbon nanotubes (CNTs) and the magnetic properties of iron oxide were combined to produce magnetic absorbents. And the influence of kinetics, isotherm and absorbent dosage on the adsorption of methyl orange in wastewater by the composite adsorbents was discussed. The results showed that when the adsorption time was 120 min and the dosage of composite adsorbents was 0.2 g, the removal efficiency of methyl orange could reach the maximum at the room temperature, and the composite adsorbents have a good recycling performance. The adsorption processes fit well to Langmuir isotherm model. The composite adsorbents were characterized and analyzed by SEM, FT-IR and XRD. The results indicated that owing to greatly-increased surface functional groups, the absorption capacity of the composite adsorbents for methyl orange in wastewater was greatly improved, comparde than CNTs.

Key words: multi-walled carbon nanotube, iron oxide, adsorption, methylorange