Efficient of Adsorption and Desorption of Zinc Ion by using Multi-Walled Carbon Nanotube

In the present work was used functionalized multi walled Carbon nanotube (fMWCNTs) as an adsorbent for zinc ion (Zn2+) in the batch of adsorption and desorption systems. The characterization of multi-walled Carbon nanotube (MWCNTs-COOH) was performed by X-Ray diffraction (XRD) and Raman spectroscopy. Here, zinc sulphate (ZnSO4·7H2O) was used as sources of zinc ion at different concentrations (0, 10, 20, 30, 40 and 50 mg/l) in adsorption batch and used the diethylene triamine pentaacetic acid (DTPA) as the elution reagent to extracted adsorbed of Zn2+ in desorption experiments. In this study, the different parameters such as pH of adsorbate, contact time, adsorbent (FMWCNTs) dosage, agitation speed and temperature were fixed at 7, 12 h, 0.05 gm, 180 rpm, and 25 ◦C, respectively. The results show that the maximum adsorption efficiency of Zn2+ onto MWCNTs increases with the increase of concentration until 40 (mg/l) and then decreased was started. While, the maximum desorption capacity (84%) at low concentration (10 mg/l). According to the correlation coefficient values (R2 ) of the equilibrium isotherm models the adsorption data was a better fitted in Freundlich isotherm compared with Langmuir isotherm.