In this work, adsorption of 2-nitrophenol (2-NP), 4-nitrophenol (4-NP), and copper on single-walled carbon nanotubes (SWCNTs) modified glassy carbon electrode (GCE) was studied via cyclic voltammetry (CV) and electrochemical impedance spectroscopy (EIS). Batch adsorption of NPs and copper by multi-walled carbon nanotubes (MWCNTs) were also conducted. Adsorptions of single species and mixtures (i.e., copper/2-NP and copper/4-NP) were conducted and compared to examine the influences of copper on the adsorption of NPs. The electrochemical analysis showed that, 2- and 4-NP had different adsorption behaviors because of the locations of nitro- and hydroxyl-groups. The double layer capacity increased with increasing concentration of 4-NP and was not affected by the concentration of 2-NP. Therefore, comparing to 2-NP, 4-NP may have more ordered structure on the surface of SWCNTs by stronger p-p interactions. The batch adsorption showed that when solution pH was higher than 7, the presence of copper enhanced the adsorption of 2-NP, and had no obvious effects on the adsorption of 4-NP. The peak current of 2-NP increased with increasing copper concentration in CV. The bode plots also showed that when the solution pH was 8, the presence of copper would affect the ordering of 2-NP, but not 4-NP. These indicated that the synergetic adsorption of copper and 2-NP might be because of the formation of a new compound or the attractions between copper species and negatively charged 2-NP.

?Investigating adsorption of nitrophenol and copper on carbon nanotubes via electrochemical analysis

248th National Meeting (2014)

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