Adsorption of eriochrome black T dye using alginate crosslinked Prunusavium leaf mediated nanoparticles: characterization, optimization and equilibrium studies

摘要

The adsorption capacity of alginate crosslinked Prunus Avium (P. Avium)/cherry leaf mediated nanoparticles (Alg-Ch-NPs) for anionic dye Eriochrome Black T (EBT) was studied in this article. The P. Avium leaf mediated nanoparticles (NPs) were made by capping the functional groups from the cherry leaf extract with Fe2SO4 and FeCl2 solution in 1:2 ratio. Surface of the NPs was modified by adding the green NPs with prepared Ca alginate gel, especially to get more positive charges to adsorb anionic dyes. Characterizations of the adsorbent were conducted by using ultra violet spectroscopy (UVS), fourier transform infrared spectroscopy (FTIR), x-ray diffraction (XRD), scanning electron microscopy (SEM), energy dispersive x-ray spectroscopy (EDX) and transmission electron microscopy (TEM). The effects of various reaction conditions such as contact time, initial concentrations, dosages, pH and ionic strength on adsorption of EBT dye using Alg-Ch-NPs were studied. Langmuir, Freundlich and Tempkin isotherm models were used to analyze adsorption equilibrium isotherms, and it was found that the Freundlich isotherm model was best fitted with the experiment data. As well as, pseudo-first-order and pseudo-second-order kinetic models were used in kinetic experiments on the data, and it was found that pseudo-first-order kinetic model was most suitable. In addition, Weber's intraparticle diffusion model was also used to gain the adsorption mechanisms and furthermore boundary layer effect of the adsorbents was found. The maximum adsorption capacity of Alg-Ch-NPs on EBT dye was 85.66 mg/g, which is significantly higher compared with other studies on adsorption of EBT dye.