Adsorption of Ni(II) from Aqueous Solution Using Oxidized Multiwall Carbon Nanotubes

By Changlun Chen, Xiangke Wang. 2006

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In this work, oxidized multiwall carbon nanotubes (MWCNTs) were used as a novel adsorbent for removing Ni(II) from aqueous solution. The adsorption of Ni(II) onto oxidized MWCNTs was studied as a function of contact time, pH, ionic strength, MWCNT concentration, and temperature. The results showed that Ni(II) adsorption onto MWCNTs is strongly dependent on pH and oxidized MWCNT concentration and, to a lesser extent, ionic strength. Kinetic data indicated that the adsorption process achieved equilibrium within 40 min and follows a pseudo-second-order rate equation. The adsorption data fit the Langmuir model and its linearized form well, together with thermodynamic data indicating the spontaneous and endothermic nature of the process. Results of a desorption study showed that Ni(II) adsorbed onto oxidized MWCNTs could be easily desorbed at pH <2.0. Ion exchange may be the predominant mechanism of Ni(II) adsorption on oxidized MWCNTs. Oxidized MWCNTs may be a promising candidate for concentration of heavy me...

Subfields: Biomedical Engineering, Materials Chemistry

View Paper: https://www.semanticscholar.org/paper/280424cf15a2268d5781c886cf9e970e805a46de

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In Materials Chemistry

Citations in the corpus

The role of nanomaterials as effective adsorbents and their applications in wastewater treatment (2017, methodology): “The predominant mechanism of Ni(II) sorption onto MWCNTs was reported to be ion exchanged at low pH values and by strong surface complexation at high pH values [41].”
Nanoparticles as Adsorbent; A Positive Approach for Removal of Noxious Metal Ions: A Review (2015, background): “properties possessed by graphene and CNTs that have enabled them to exhibit enhanced adsorptive properties (Ray, 2010; Zhang et al., 2013; Chen and Wang, 2006; Curran et al., 2006; Wang and Grady Jr., 1995; Bellona et al., 2004; Kwon et al., 2008; Bhatkhande et al., 2002; Hoffmann et al., 1995) and ”