Adsorption behaviour of methylene blue on carbon nanoparticles

Nanoadsorbents have been regarded as promising materials for water treatment. The adsorption behaviour determines the applications of nanoadsorbents. In this reported work, the authors studied the adsorption behaviour of methylene blue on oxidised carbon nanoparticles (O-CNPs) in batch experiments. The adsorption data were fitted by the Freundlich model, rather than the Langmuir model. The kinetics studies indicated that it followed the pseudo-second-order model. The intraparticle diffusion model fitting suggested that the adsorption involved both intraparticle diffusion and surface diffusion. The adsorption was more effective at higher pH and lower ionic strength. The implication for the applications of O-CNPs in water treatment is discussed.