Synthesis, characterization and cytotoxicity of surface amino-functionalized water-dispersible multi-walled carbon nanotubes

Solid Phase Extraction to On-Line Preconcentrate Trace Cadmium Using Chemically Modified Nano-Carbon Black with 3-Mercaptopropyltrimethoxysilane

“…The second event occurred in the temperature at 348 °C could be attributed to the decomposition of hydrophilic side groups still present in the material, and the third one observed at 497 °C is ascribed to thermal decomposition of 3-MPTMS bonded to carbon sheets, as has been reported in literature for carbon sulfur compounds. 26,42 The lower weight loss of the 3-MPTMS-grafted CB compared to oxidized CB and, as consequence, a higher ceramic yield is most likely due to the formation of SiO 2 during heating, which also confirms the functionalization process.…”

“…41 After oxidation process, the spectrum for oxidized CB exhibited a new band at 1585 cm −1 , which is attributed to hydroxyl groups or carbonyl groups. 42 In 3-MPTMS-grafted CB (Figure 3c) this signal is reduced, most likely due to insertion of 3-MPTMS agent inside the pores of material which may have caused the reduction in surface area and pore volume of this CB, as described in its textural properties. The evidence of the silanization comes from the weak signals at 769 and 673 cm −1 due to Si-O stretching vibrations.…”

Removal of Hg2+ and methylmercury in waters by functionalized multi-walled carbon nanotubes: adsorption behavior and the impacts of some environmentally relevant factors

“…The peaks at ~3450 cm −1 correponded to -NH 2 stretching vibration in the MWCNTs-NH 2 spectrum. In addition, the presence of peaks at ~1415 and ~1262 cm −1 , origined from N-H in-plane and C-N bond stretching, respectively [39].…”

“…Generally these functional groups located on the surface defect of the carbon nanotubes [38]. In the MWCNTs-COOH spectrum the characteristic peaks appeared at the ~3451 and ~1617 cm −1 , which are assigned to stretching vibrations of v(-OH) and v(C=O) of -COOH [34,39]. The peaks at ~3450 cm −1 correponded to -NH 2 stretching vibration in the MWCNTs-NH 2 spectrum.…”

Evaluation of Histidine Functionalized Multiwalled Carbon Nanotubes for Improvement in the Sensitivity of Cadmium Ions Determination in Flow Analysis

“…In addition, the band can be attributed to hydroxyl groups present in water physically adsorbed. The signal at 1097cm −1 is assigned to the ν(C-O) stretching vibration (Gaoa, et al 2009, Vukovic et al 2009). The band at 2924 cm -1 is assigned to asymmetric stretching vibrations of ν(CH 2 ).…”