Abstract
chromium is one of the most important water pollutants being Cr(VI) the one with the greatest environmental impact. The objective of this work is to evaluate the adsorption capacity of a biosorbent formed by chitosan-orange peel (CTS-OP) to remove hexavalent chromium from water. The novelty of this work is the evaluation of the drying process effect (oven, vacuum, and freeze-drying) on chromium adsorption capacity. Adsorbents are characterized using X-ray diffraction, FTIR spectroscopy and adsorption kinetics and isotherms measuring Cr(VI) concentration using UV-Vis absorption at 540 nm after complexing with 1,5–diphenylcarbazide. Adsorption capacity is enhanced at pH 2.0 and OPW particle size of 0.300 microns. The shoulder that appears at 944 cm-1 after Cr(VI) adsorption in all three kind of CTS-OPW beads, indicate that chromate ion is bonding with the sorbent. The chi-squared analysis (χ2) indicate that Freundlich isotherm fits better that Langmuir isotherm for all CTS-OPW beads, and the best fit is obtained with Elovich model for kinetic studies. The adsorption capacity of the CTS-OPW beads was also evaluated for the three types of drying. It can be concluded that vacuum oven-dried beads have the highest hexavalent chromium adsorption capacity, 33.89 mg g-1, followed by freeze-dried beads, 32.4 mg g-1, and finally oven-dried beads with a value of 27.5 mg g-1.
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