Adsorption of cadmium(II) from aqueous solution by surface oxidized carbon nanotubes

By Yan-hui Li, Shuguang Wang, Z. Luan, Jun Ding, Cai-lu Xu, De-hai Wu. 2003

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Carbon nanotubes (CNTs) were oxidized with H2O2, KMnO4, and HNO3. Their physicochemical properties were investigated by BET N-2 adsorption, laser particle examination, Boehm's titration, zeta potential measurement and cadmium(II) adsorption. The experimental results suggest that cadmium(II) adsorption capacities for three kinds of oxidized CNTs increase due to the functional groups introduced by oxidation compared with the as-grown CNTs. The cadmium(II) adsorption capacity of the as-grown CNTs is only 1.1 mg g(-1), while it reaches 2.6, 5.1 and 11.0 mg g(-1) for the H2O2, HNO3 and KMnO4 oxidized CNTs, respectively, at the cadmium(II) equilibrium concentration of 4 mg 1(-1). Adsorption of cadmium(II) by CNTs was strongly pH-dependent and the increase of adsorption capacities for HNO3 and KMnO4 oxidized CNTs is more obvious than that of the as-grown and H2O2 oxidized CNTs at lower pH regions. The experiments of CNT dosage effect on the cadmium(II) adsorption show that the adsorption capacity for KMnO4 oxidized CNTs has a sharper increase at the CNT dosage from 0.03 to 0.08 g per 100 ml than the as-grown, H2O2 and HNO3 oxidized CNTs and its removal efficiency almost reaches 100% at CNT dosage of 0.08 g per 100 ml. Analysis revealed that the KMnO4 oxidized CNTs hosted manganese residuals, and these surely contributed to cadmium sorption to a yet-undefined extent. (C) 2002 Elsevier Science Ltd. All rights reserved.

Subfields: Biomedical Engineering, Materials Chemistry

View Paper: https://www.semanticscholar.org/paper/c577ee53c6af43b689b6641ad54440d50bb03b86

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Citations in the corpus

The role of nanomaterials as effective adsorbents and their applications in wastewater treatment (2017, background): “Oxidized CNTs have also shown exceptionally high sorption capacity and efficiency for Pb(II), Cd(II) and Cr(VI) from water [78, 93, 94].”
Analysis of the structure and chemical properties of some commercial carbon nanostructures (2009, neutral): “Other groups already reported similar observation for activated carbon and other multiwall carbon nanotubes samples treated in a similar way [92-95].”
Removal of Heavy Metals from Wastewater Using Carbon Nanotubes (2014, background): “(27) discussed the adsorption of Cd2+ by CNTs.”
Adsorption of zinc(II) from water with purified carbon nanotubes (2006, background): “This is due to the fact that oxidation of carbon surface can provide not only a more hydrophilic surface structure but also many oxygen-containing groups, which increase the ion-exchange capacity of carbon materials ( Li et al., 2003a ), therefore, lead to a significant increase in the adsorption of”