The adsorptive removal of arsenic from water using a multiwall carbon nanotube-zirconia nanohybrid (MWCNT-ZrO 2) is presented. The MWCNT-ZrO 2 with 4.85% zirconia was effective in meeting the drinking water standard levels of 10μgL -1. The absorption capacity of the composite were 2000μgg -1 and 5000μgg -1 for As(III) and As(V) respectively, which were significantly higher than those reported previously for iron oxide coated MWCNTs. The adsorption of As(V) on MWCNT-ZrO 2 was faster than that of As(III), and a pseudo-second order rate equation effectively described the uptake kinetics. The adsorption isotherms for As(III) and As(V) fitted both the Langmuir and Freundlich models. A major advantage of the MWCNT-ZrO 2 was that the adsorption capacity was not a function of pH.
All Science Journal Classification (ASJC) codes
- Electronic, Optical and Magnetic Materials
- Surfaces, Coatings and Films
- Colloid and Surface Chemistry
- Carbon nanotubes