Sorption properties of modified single-walled carbon nanotubes

Application of water–activated carbon isotherm models to water adsorption isotherms of single-walled carbon nanotubes

“…To the best of our knowledge, the Dubinin-Serpinsky (DS) equation [13] remains the only water-activated carbon isotherm model that has been applied to SWNTs [11]. Several recent studies have reported water isotherms on SWNTs [14,15] without further analysis of the isotherm data by semiempirical models that are readily available. The DS equation is one of the most common equations, but is also one of the simplest water adsorption isotherm models.…”

Natural soil mineral nanoparticles are novel sorbents for pentachlorophenol and phenanthrene removal

“…Therefore, the speciation of PCP is likely to be a main factor influencing its sorption changes by mineral NPs with changes in solution pH. Additionally, hydrogen-bonding interactions could form and play an important role in sorption when the OCs or NPs had certain functional groups such as eCOOH and eOH (Vermisoglou et al, 2007;Yang et al, 2008). The much lower sorption of dissociated species of PCP at pH 6 and 10 relative to its neutral form at pH 4 on both mineral NPs might thus be simultaneously attributed to the decreased hydrogen bonding donor ability and higher solubility (i.e., lower hydrophobic effect) of dissociated species of PCP.…”

Organic contaminants and carbon nanoparticles: sorption mechanisms and impact parameters

“…In addition, 2-naphthol with two benzene rings has much stronger π-electron-conjugating potential than 2,4-dichlorophenol with one benzene ring . The adsorption of organic contaminants with -OH and -COOH functional groups on CNPs may be enhanced via hydrogen bonds (Vermisoglou et al, 2007;van Wieren et al, 2012). Yang et al (2008) indicated that the adsorption affinity of phenol or aniline on CNPs was enhanced with their substituted groups at a given position in the following order: nitro group>chloride group>methyl group, due to differences in the ability to form hydrogen bonds (Yang et al, 2008).…”

“…Electrostatic interaction may be the dominant interaction for the adsorption of charged organic contaminants on CNPs (MacKay and Vasudevan, 2012), such as the adsorption of fluoroquinolone antibiotics (OFL and NOR) on CNTs, as affected by pH (Wang et al, 2009;Peng et al, 2012b). Hydrogen bonds can form between CNPs and organic contaminants if both chemicals and CNPs have certain functional groups, such as -OH, -COOH, -F, and -NH 2 (Vermisoglou et al, 2007;van Wieren et al, 2012). π-π interaction has also been used to interpret the adsorption of organic contaminants with a benzene ring or C=C double bond on the CNP surface (Chorover et al, 1999;Kulshrestha et al, 2004;Woods et al, 2007).…”