On the nature of basic sites on carbon surfaces: an overview

Preparation and characterization of activated carbon from a new raw lignocellulosic material: Flamboyant (Delonix regia) pods

“…In addition, the signal in at 170 ppm indicates the presence of carbonyl groups associated with these basal planes. The alkaline treatment of the activation process led to the formation of polycyclic pyrones (Montes-Morán et al, 2004;Fuente et al, 2003), which is in agreement with the spectrum signals (Fig. 2b).…”

Hydrothermal functionalization of ordered mesoporous carbons: The effect of boron on supercapacitor performance

“…(KCl, 1M) is generally ascribed to the hydroquinone / quinone redox couple [16,25], but it has been recently demonstrated that pyrones [50], carbonyls or phenols [51] can also give rise to faradaic reactions in the same potential range (Fig. 6c).…”

pH-responsive ordered mesoporous carbons for controlled ibuprofen release

“…It is generally accepted that both the delocalized electrons of the graphitic structure and the presence of surface functional groups determine the acid/base character of the carbon surface. In this sense, carbonyl, carboxylic acid, phenolic or lactone groups are classified as acidic functionalities, while pyrones, chromenes, quinones or nitrogen functional groups are considered as basic ones [40][41][42][43]. The small differences in pH PZC between the two studied carbons can be justified by their different contents in functional groups (Table 3) and repulsive) between the positively or negatively charged functionalities in both ibuprofen and carbon; (iii) electron donoracceptor interactions between the aromatic ring of ibuprofen and the basic surface groups of the carbon.…”