Synthesis of MWCNTs over natural magnetic rock in presence of water

This study, multiwalled carbon nanotubes (MWCNTs) were synthesized over natural magnetic rock as an efficient catalyst in the absence or presence of water vapor and the produced magnetic nanocomposites were employed for mercury(II) adsorption. The catalyst and magnetic nanocomposite were characterized using, EDX, FT-IR. Results for Hg(II) ion adsorption experiments showed that an efficient magnetic adsorbent was successfully generated by the method. The water vapor improved the adsorption properties of CNTs, making the surface more suitable for Hg(II) ion adsorption because the water assisted oxidized CNTs exhibit 33% higher adsorption capacity for Hg(II) ions compared to oxidized CNTs synthesized in absence of water vapor. The kinetics of Hg(II) adsorption on the four CNTS powders revealed different behaviors so that the non-oxidized CNTs followed first-order kinetics but second-order model well described adsorption properties of oxidized sorbents.

کلیدواژه ها:

multi-walled carbon nanotubes ، presence of water ، EDX analysis ، FT-IR spectra