New insight into adsorption mechanism of ionizable compounds on carbon nanotubes.

  title={New insight into adsorption mechanism of ionizable compounds on carbon nanotubes.},
  author={Xiaoyun Li and Joseph J. Pignatello and Yiquan Wang and Baoshan Xing},
  journal={Environmental science & technology},
  volume={47 15},
We studied the pH-dependent adsorption of benzoic acid (BA), phthalic acid (PA), and 2,6-dichloro-4-nitrophenol (DCNP) by hydroxylated, carboxylated, and graphitized carbon nanotubes (CNTs). Adsorption is contributed by formation of a negative charge-assisted H-bond (-)CAHB between a carboxyl group on the solute and a phenolate or carboxylate group on the surface having a comparable pKa. This exceptionally strong H-bond is depicted as (RCO2···H···O-CNTs)(-). Over a limited pH range the free… CONTINUE READING


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