International Journal of Environment Science and Technology
Center for Environment and Energy Research and Studies (CEERS)
Vol. 11, No. 3, 2014, pp. 785-794
Bioline Code: st14078
Full paper language: English
Document type: Research Article
Document available free of charge
International Journal of Environment Science and Technology, Vol. 11, No. 3, 2014, pp. 785-794
© International Journal of Environment Science and Technology
Adsorption of roxarsone by iron (hydr)oxide-modified multiwalled carbon nanotubes from aqueous solution and its mechanisms|
Hu, J.; Tong, Z.; Chen, G.; Zhan, X. & Hu, Z.
The adsorption of roxarsone by iron (hydr)oxide-
modified multiwalled carbon nanotubes (MWCNTs)
from aqueous solution and its mechanism were investigated.
The amount of roxarsone adsorbed by modified
MWCNTs is higher than MWCNTs at the same condition.
The results show that the sorption isotherms are nonlinear,
and can be well fitted according to the Freundlich and
Polanyi–Manes models. The adsorption kinetics could be
well described by pseudo-second-order model. Thermodynamic
analysis shows that the adsorption of roxarsone on
the adsorbents is an exothermic and spontaneous process.
Desorption process had no obvious desorption hysteresis
phenomenon. The FT-IR and XPS analysis confirmed
the loading of iron ions on the MWCNTs, and revealed the
involvement of carboxyl groups and iron ions on the
adsorption of roxarsone.
Adsorption; Desorption; Iron hydroxide modification; Multiwalled carbon nanotubes (MWCNTs); Roxarsone
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