Premium
Cr(VI) Adsorption to Magnetic Iron Oxide Nanoparticle‐Multi‐Walled Carbon Nanotube Adsorbents
Author(s) -
Lee ChangGu,
Kim SongBae
Publication year - 2016
Publication title -
water environment research
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.356
H-Index - 73
eISSN - 1554-7531
pISSN - 1061-4303
DOI - 10.2175/106143016x14733681695401
Subject(s) - adsorption , carbon nanotube , nanoparticle , iron oxide , chemical engineering , iron oxide nanoparticles , nanotube , oxide , materials science , chemistry , nanotechnology , inorganic chemistry , organic chemistry , engineering
The aim of this study was to investigate the Cr(VI) adsorption to magnetic iron oxide(MIO) nanoparticle‐ multi‐walled carbon nanotubes (MWCNTs) in aqueous solutions using batch experiments. Results show that the maximum adsorption capacity of Cr(VI) to MIO‐MWCNTs was 11.256 mg/g. Kinetic model analysis demonstrates that the pseudo‐second‐order model and Elovich model are suitable for describing the kinetic data. Thermodynamic analysis indicates that Cr(VI) adsorption to MIO‐MWCNTs decreased with increasing temperature from 5–60 °C, indicating the spontaneous and exothermic nature of the sorption process. Equilibrium isotherm analysis demonstrates that the Redlich‐Peterson model suitably describes the equilibrium data. In the pH experiments, Cr(VI) adsorption to MIO‐MWCNTs decreased gradually from 5.70–2.13 mg/g with increasing pH from 3.0–7.3. Sequential extraction indicates that, among the five binding forms of Cr(VI) associated with MIO‐MWCNTs, the predominant contributions are the fraction bound to Fe‐Mn oxides (57.82%) and the residual (23.38%).