Investigation of factors affecting adsorption of transition metals on oxidized carbon nanotubes

Thermodynamic of the Interactions Between Gas-Solidand Solid-Liquid on Carbonaceous Materials

“…Table 7 shows the results of the amount of surface groups of each of the samples obtained through Boehm titration. It is observed that the content of acid groups increased by the oxidation treatment, favoring mainly the formation of carboxylic groups, such as reported in other studies (Gao et al 2009). Additionally heat treatment changed the number of groups according to their different thermal stabilities, so, in general it is considered that at low temperatures (about 700 K) and in an inert atmosphere carboxylic groups decompose; in the range of 1000 K lactone groups, carboxylic anhydrides, phenol and ether decomposition is favored; and in higher temperatures up to 1200 K quinone and pyrone groups decompose.…”

The role of nanomaterials as effective adsorbents and their applications in wastewater treatment

“…CNTs were also reported as good adsorbents for multi-component sorption of metal ions [71]. The sorption mechanisms were reported to be governed by the surface features, ion exchange process and electrochemical potential [95]. The latter plays a significant role in multi-component sorption where redox reactions, not only on the adsorbent surface but also among the different adsorbates, are likely to occur.…”

Functionalization of acidified multi-walled carbon nanotubes for removal of heavy metals in aqueous solutions

“…10 The effect of different pH [5][6][7][8][9] 2? has no ability to compete the other three metal ions as it is considered to be the most weakly adsorbed species. Many studies attributed the behavior of the multi-component systems to the CNT adsorption sites [34][35][36] . The competitive adsorption may be related to ion exchange and electrochemical properties of the cations.…”