Abstract
ABSTRACTIn this study, we propose a chemical pretreatment to improve the performance of a hemp‐based material in felt form used as an adsorbent for removing the metals from aqueous mixtures of Cd, Co, Cu, Mn, Ni, and Zn. The felt was coated with a maltodextrin‐1,2,3,4‐butane tetracarboxylic polymer in order to provide ion‐exchange properties to the material by introducing carboxylic groups. It was characterized by solid‐state 13C‐NMR technique and by energy‐dispersive X‐ray spectroscopy. This new adsorbent was then used in batch experiments and its performances were compared with those of non‐modified hemp. Different controlling experimental conditions have been investigated. Modified hemp exhibited strong adsorption capacities due to a chemisorption mechanism (complexation, ion exchange): up to 25 mg/L (in reality, 150 mg of metals per L), all metals in the solution were removed. A modified hemp dosage of 1 g was able to remove 13.91 mg of metals in 100 mL of solution at a concentration of 25 mg/L for each metal, whereas nonmodified hemp only removed 7.4 mg in the same experimental conditions. Adsorption of metals reached equilibrium in 60 min and the performances were pH‐independent between 3 and 6, but dependent on the presence of NaCl, except for Cu. © 2017 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2017, 134, 45138.
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