Immobilization of avidin on the functionalized carbon nanotubes

A highly selective chemical gas sensor based on functionalization of multi-walled carbon nanotubes with poly(ethylene glycol)

“…Furthermore, the intensities of the C-H stretching frequencies at 2860 and 2920 cm −1 corresponding to the alkyl groups are more intense in the MWNT-g-PEG than in the pristine MWNT-COOH. These results preliminarily indicate the presence of significant carbonyl groups chemically attached to an ester bond, that is to say, the PEG molecules are covalently bound to the MWNT-COOH [22,23]. In addition, the spectrum of MWNTg-PEG samples showed a vibration band characteristic of PEG, a sharp peak at 1107 cm −1 corresponding to the ether group of PEG, while it is slightly weakened in the MWNT-g-PEG sample.…”

Adsorption behavior of epirubicin hydrochloride on carboxylated carbon nanotubes

“…In addition, after oxidation with nitric acid, some bundles appeared exfoliated and the c-MWNTs seemed to be shorter length than pristine MWNTs. The above observations indicate that after nitric acid treatment, the MWNTs become reactive at the ends as well as at the sidewalls (Kim et al, 2006). A large amount of oxygen-containing groups modified on those defect sites can support the stability of c-MWNTs in polar media (Datsyuk et al, 2008).…”

Optimization of activated carbon production from empty fruit bunch fibers in one-step steam pyrolysis for cadmium removal from aqueous solution

“…Figure 5 shows a comparison between the FTIR curves for samples AC2 and AC7, the samples with the highest and lowest cadmium removal, respectively. It can be observed that peaks appear in the range of 1,850-2,000 cm -1 and 1,750-1,845 cm -1 , corresponding to the C=O (Kim et al 2006;Tan and Xiao 2009). Other peaks appear at 2,970, 1,738, 1,434, 1,365, and 1,216 cm -1 , where the first peak corresponds to the -OH, while the other peaks correspond to the -COOH (Wu et al 2007).…”