A chitosan nanoparticle (CS NP)-modified MnO2 nanoflake was presented as a novel adsorbent for fast adsorption of Pb(II) from aqueous solution. Loading dense CS NPs onto mono-dispersive flower-like MnO2 nanostructures reduces the overlap of CS during adsorption, thus improves the contact of functional adsorption sites on the surface of MnO2 nanoflakes to heavy metal ions. The results show that the removal efficiency of the nanoadsorbents reaches up to 93% in 3 min to Pb(II). In addition, the maximum adsorption capacity, effects of adsorbent dosage and pH value, and the reusability were also investigated. The kinetic process and adsorption isotherm fit well with the pseudo-second-order model and Langmuir model, respectively. These findings provide a potential strategy to address the overlap issue of some common nanoadsorbents.
- heavy metal ions
- surface modification
- First received 16 March 2016.
- Accepted in revised form 10 June 2016.
- © IWA Publishing 2016