ADSORPTION-COUPLED REDUCTION OF HEXAVALENT CHROMIUM BY JUTE-BASED ANIONIC ADSORBENT FROM AQUEOUS SOLUTIONS

摘要

A new efficient anion adsorbent was fabricated by amino-grafting lignocellulose-rich jute stalk (AGJ) to uptake toxic hexavalent chromium (Cr(VI)) from aqueous solutions. Batch adsorption experiments were performed as a function of adsorbent dosage and initial solution pH to test the adsorption-coupled reduction for anion Cr(VI). Maximum chromium adsorption was found at pH 2.0 with an appropriate adsorbent dosage of 1.0 g/L. The adsorption equilibrium data were best described by the Langmuir isotherm model. The maximum monolayer adsorption capacity was 154.30 mg/g, evaluated using the Langmuir equation. The kinetic analysis revealed that the adsorption of Cr(VI) was fitted very well by the pseudo-second-order model during the whole adsorption process. The binding mechanism of chromium onto the AGJ surface was confirmed by Fourier transform infrared spectroscopy (FTIR) and X-ray photoelectron spectroscopy (XPS) analyses. All the results in this study illustrated that AGJ could be considered as an economically viable and effective adsorbent for treatment of aqueous solutions contaminated with Cr(VI).