abstract

• Carbon nanotubes (CNTs) show exceptional properties which make them extremely attractive for many applications. The electronic structure of potassium adsorbed single-walled carbon nanotubes (SWCNTs) is investigated by x-ray near edge structure (XANES) spectroscopy. Gas molecules (H2O, O2, CO2, CO) and potassium (K) adsorbates showed non negligible sensitivity to the geometry, thermal annealing treatment, and hybridization. TheSWCNTtype is shown by transmission electron microscopy (TEM) whereas an aleatory arrangement of SWCNTs and the spherical iron particles along carbon nanotubes are observed by scanning electron microscopy (SEM). XANES shows that the charge transfer effect in K-doping SWCNTs increases the conductivity to 62.7%25. The adsorption study demonstrates that the adsorption mechanism to remove potassium from aqueous solutions using SWCNTs is assimilated to the ion exchange process. The functional groupsOH-, C=OandC≡Care involved in the adsorption process. They are correlated to the assignment of the adsorbates given by XANES. © 2021 IOP Publishing Ltd.

authors

• Delgado G.J.L.

publication date

• 2021-01-01

published in

• Physica Scripta  Journal

keywords

• Adsorption; Carbon nanotubes; Hybridization; Thermal annealing; XANES spectroscopy Adsorption; Charge transfer; Electronic structure; High resolution transmission electron microscopy; Ion exchange; Iron metallography; Nanotubes; Potassium; Scanning electron microscopy; X ray absorption; Adsorption mechanism; Adsorption process; Adsorption studies; Ion exchange process; Single-walled carbon nanotube (SWCNTs); Thermal annealing treatment; X-ray absorption near edge spectroscopy; X-ray near edge structure spectroscopies; Single-walled carbon nanotubes (SWCN)

Digital Object Identifier (DOI)

• 10.1088/1402-4896/ac0b86

PubMed ID

start page

end page

volume

• 96

issue

• 10