Carbon Encapsulated Zero-Valent Iron Nanoparticle Using Abelmoschus esculentus (Lady’s Finger) Extract as an Adsorbent for Cr(VI) in Aqueous Solution

摘要

In this study, lady’s finger carbon encapsulated zero-valent iron nanoparticle (LCINp) was synthesizedand used as an adsorbent for Cr(VI) ions in aqueous solution. The material characterization wasanalysed using Transmission Electron Microscopy (TEM), Scanning Electron Microscopy (SEM), FourierTransform Infrared Spectroscopy (FTIR), and X-Ray Diffraction (XRD). Factors influencing theadsorption process such as pH, adsorbent dosage, and initial Cr(VI) concentration were studied usingbatch sorption experiments. Langmuir, Freundlich, and Temkin isotherm models have been applied toinvestigate the adsorption capacity of LCINp. Pseudo-first-order, Pseudo-second order, and Elovichmodel have been analysed for the kinetic study. The mechanism of adsorption was examined usingBoyd’s model and Weber-Morris intraparticle diffusion model. The results showed that Langmuir modeland Pseudo-second-order kinetic model fit well in the adsorption process. Thermodynamic analysisportrayed that the adsorption process was spontaneous and endothermic in nature.