Journal
CHEMOSPHERE
Volume 264, Issue -, Pages -Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.chemosphere.2020.128557
Keywords
Ion exchange resin; Activated carbon; Electrosorption; Capacitive deionization; Copper ions
Categories
Funding
- Zhejiang Province Nature Science Foundation, China [LY19E060003, LQ19B060009]
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The preparation of activated carbon from cation-exchange resin via heat treatment and CO2 activation has shown excellent performance in removing Cu2+ from water, surpassing that of commercial activated carbon. Resin-based activated carbons have potential as electrode materials for efficiently removing heavy metals from contaminated water in CDI process.
Capacitive deionization (CDI) is a promising method to remove metal contaminants in water. Herein, we report on the preparation of activated carbon from cation-exchange resin by introducing ZnCl2 via ion exchange followed by heat treatment and CO2 activation, which is evaluated for removal of Cu2+ in water via CDI technology. The results have shown that both the heat treatment and the CO2 activation are helpful to tune the pore structure of the activated carbons in terms of ions adsorption and transportation. The activated carbon prepared by heat treatment at 600 degrees C and CO2 activation at 750 degrees C, named as AC-600-750, has the highest specific surface area of 1162 m(2) g(-1) and a specific capacitance of 247.4 F g(-1) at 50 mV(-1), with a Cu2+ adsorption capacity of 77.8 mg g(-1) at 1.2 V in 50 mg L-1 CuCl2 solution that is much higher than that of the commercial activated carbon. The electrosorption of Cu2+ ions over activated carbon follows a monolayer adsorption scheme, of which the kinetic can be well explained by pseudo-first-order kinetic model. The resin-based activated carbons are of potential as an electrode material for efficient removal of heavy metal from contaminated water by CDI process. (C) 2020 Elsevier Ltd. All rights reserved.
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