| Summary: | This research describes the adsorption of Cu<sup>2+</sup> onto a helical ribbon carbon nanofiber. The characterization of carbon nanofiber by zeta potential showed an isoelectronic pH of 1.9. The influence of different adsorption factors, such as stirring speed, temperature, pH, adsorbent concentration, etc., on the Cu<sup>2+</sup> adsorption capacity have been evaluated. The pH has a great influence on Cu<sup>2+</sup> adsorption, with the maximum adsorption capacity reached at a pH of 10. The experimental data fit well to pseudo-second order kinetic and Langmuir isotherm models (<i>q</i><sub>m</sub> = 8.80 mg·g<sup>−1</sup>) at <i>T</i> = 298 K and pH = 4. The Cu<sup>2+</sup> adsorption could be explained by the particle diffusion model. Results showed that carbon nanofiber could be successfully used for the elimination of Cu<sup>2+</sup> from wastewater.
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