Surface and electrosurface characterization of surface-oxidized multi-walled N-doped carbon nanotubes

Comparative study of Ni(ii) adsorption by pristine and oxidized multi-walled N-doped carbon nanotubes

“…Aer the acidic treatment the N-CNTs were ltered and washed with distilled water until pH 5-6 was reached, and then dried at 120 C. The mixture of H 2 SO 4 and HNO 3 turned out to be very efficient for oxidation of CNTs as it was shown in our previous work. 16 The presence of the -OH and -COOH functional groups on the surface was conrmed by X-ray Photoelectron Spectroscopy (XPS) and Fourier-transfer infrared spectroscopy (FTIR) measurements. The BET surface of the untreated N-CNT was 131 m 2 g À1 which was increased to 146 m 2 g À1 aer oxidation.…”

Multifunctionalized Carbon Nanotubes Polymer Composites: Properties and Applications

“…The oxidized CNTs are easily dispersible in a variety of NH-R organic solvents, under the impact of an ultrasonic force field (Lertrojanachusit et al 2013;Parveen et al 2013). In a following work, treating MWCNTs by sonication in H 2 O caused the implementation of O-containing functionalities (OH, C-O-C and COOH) and no considerable harm to the basic CNTs structure (Vanyorek et al 2014;Parodi et al 2014). The production of functional groups is reflected in the withdrawal of -CH n groups existing on the pristine CNTs and the presence of H bonding between the CNTs and the aqueous medium (Wang et al 2014a, b, c;Sato et al 2013).…”

Optimization of thiamethoxam adsorption parameters using multi-walled carbon nanotubes by means of fractional factorial design

“…These groups can either be directly attached to the surface of the tubes or may originate from carboxyl groups (ACOOH) and adsorbed water molecules (moisture) (Stobinski et al, 2010). The band at wavenumber 1380 cm À1 indicates the AOH groups bending vibrations (Vanyoreka et al, 2014). The stretching vibrations of ACH 2 and ACH 3 groups are present at wavenumbers 2914 cm À1 and 2842 cm À1 , respectively, while the appearance of the band at 1568 cm À1 confirms the presence of aromatic C@C vibrations which are characteristic of the nanotubes structure (Vanyoreka et al, 2014).…”

“…The band at wavenumber 1380 cm À1 indicates the AOH groups bending vibrations (Vanyoreka et al, 2014). The stretching vibrations of ACH 2 and ACH 3 groups are present at wavenumbers 2914 cm À1 and 2842 cm À1 , respectively, while the appearance of the band at 1568 cm À1 confirms the presence of aromatic C@C vibrations which are characteristic of the nanotubes structure (Vanyoreka et al, 2014). The presence of the carboxyl and/or carbonyl groups can be identified by two bands at wavenumbers 1706 cm À1 and 1614 cm À1 , which can be assigned to stretching vibrations of C@O group (Motchelaho et al, 2011).…”