Adsorption thermodynamic and kinetic studies of trihalomethanes on multiwalled carbon nanotubes

Kinetics and thermodynamics of sorption of nitroaromatic compounds to as-grown and oxidized multiwalled carbon nanotubes

“…Apparent equilibrium was reached within 180 min, for most of the NACs considered within 30 min and for NB, sorption occurred within 10 min. This fast sorption process was similar to that which had been observed for trihalomethanes [18] and reactive dyes [19]. Individual MWCNTs have a dominant adsorption domain which is primarily the outermost graphene surface and defect sites.…”

“…This may be attributed to the smaller molar volume (V s ) and Van der Waals square (S Vdw ) ( Table 1) for NB compared to the other NACs studied, since it is well known that smaller molecules are adsorbed faster than bigger ones [18].…”

“…Understanding the kinetics and thermodynamics of the sorption process is critical for the development of more efficient sorbents suitable for real world applications. While studies of the sorption kinetics and thermodynamics of metals are generally well known, very little information is currently available regarding the sorption of organic compounds, such as trihalomethanes [18] and dyes [19], onto MWCNTs. These limited studies suggested that the sorption of the reactive dye and trihalomethanes was spontaneous and mainly due to physical sorption.…”

Comparative study of carbon nanotubes and granular activated carbon: Physicochemical properties and adsorption capacities

“…WRI 2000) Other studies have found higher adsorption capacities of CNT compared with AC for pollutants in the liquid phase (Su and Lu, 2007;Lu et al, 2006;Lu et al, 2005). Although several studies have found low adsorption capacities for CNT, these studies did not open the CNT ends to allow pollutants to access interior space for adsorption (Bittner et al, 2003;Diaz et al, 2007).…”

“…Organic chemical adsorption onto CNT, however, is comparable to or even higher than that onto ACs . CNTs have also been shown to have shorter equilibrium times than traditional AC (Lu et al, 2006;Lu et al, 2005;Peng et al, 2003).…”