抄録
Magnetite-iron from spent pocket warmers was recovered and coated with chitosan that was modified with 2-oxoglutaric acid. This material was used to remove toxic Pb2+ from aqueous solution. The prepared adsorbents were characterized by SEM, XRD, IR, and ionic dye adsorption experiments. Adsorption of Pb2+ depended on the composition of the iron (magnetite or unoxidized iron) from the pocket warmer and impurities, such as charcoal and vermiculite. For samples with a high magnetite content, adsorption of Pb2+ was good. When 0.5 g of the present adsorbent was used in the treatment for 50 mL solution containing 10 mg/L of Pb2+ , the removal efficiency more than 99% was achieved to reduce to 0.1 mg/L. The adsorption ability of Pb2+ was compared with that of an activated carbon. The adsorbent was applied to the removal of Pb2+ from wastewater of a Pb-acid battery.
