title: Adsorption of arsenic on multiwall carbon nanotube-zirconia nanohybrid for potential drinking water purification.
abstract: 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 10 μg L(-1). The absorption capacity of the composite were 2000 μg g(-1) and 5000 μg g(-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.
authors.affiliation: Department of Chemistry and Environmental Science, New Jersey Institute of Technology, Newark, NJ 07102, USA.
authors.forename: Susana Addo
authors.initials: SA
authors.lastname: Ntim
authors.forename: Somenath
authors.initials: S
authors.lastname: Mitra
mesh_terms: D000327:Adsorption; D001151:Arsenic / Q000737:chemistry*; D060766:Drinking Water / Q000737:chemistry*; D006863:Hydrogen-Ion Concentration; D007700:Kinetics; D018625:Microscopy, Atomic Force; D037742:Nanotubes, Carbon / Q000737:chemistry*; D012680:Sensitivity and Specificity; D017550:Spectroscopy, Fourier Transform Infrared; D013816:Thermodynamics; D014874:Water Pollutants, Chemical / Q000737:chemistry*; D018508:Water Purification / Q000379:methods; D014961:X-Ray Diffraction; D015040:Zirconium / Q000737:chemistry*
chemical_list: D060766:Drinking Water; D037742:Nanotubes, Carbon; D014874:Water Pollutants, Chemical; D015040:Zirconium; D001151:Arsenic; C028541:zirconium oxide