Equilibrium uptake and sorption dynamics for the retrieval of divalent zinc from aqueous solutions using Carissa carandas and Syzygium aromaticum

Green Chemistry & Sustainability Research Group, Department of Chemistry, JECRC University, Jaipur-303 905, Rajasthan, India E-mail : sk.sharmaa@outlook.com Biosorptive removal of divalent zinc from aqueous solution by using Carissa carandas and Syzygium aromaticum was investigated in batch mode and the observations were correlated with the pH change, agitation time, dose of the adsorbent and initial concentration of metal ions in the solution. Biosorbent Carissa carandas leaf powder showed higher sorption efficiency than that of biosorbent Syzygium aromaticum powder under identical experimental conditions. Based on regression coefficient (R2) values, the experimental data for adsorption of ZnII on to Carissa carandas and Syzygium aromaticum powder indicate that the Langmuir adsorption isotherm shows a better fit with the experimental data observed in this study compared with the Freundlich isotherm