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Hybrid capacitive deionization of NaCl and toxic heavy metal ions using faradic electrodes of silver nanospheres decorated pomegranate peel-derived activated carbon. | LitMetric

AI Article Synopsis

  • Capacitive deionization (CDI) is a promising method for removing salt and harmful metal ions from brackish wastewater, but traditional CDI electrodes struggle with efficiency and long-term performance.
  • A new electrode made from pomegranate peel-derived activated carbon combined with silver nanospheres (Ag/P-AC) shows improved salt adsorption and selective metal ion removal due to its higher surface area and better capacitance.
  • This innovative Ag/P-AC electrode was effective in efficiently removing various contaminants, such as NaCl and toxic metal ions like Pb(II), Cd(II), and As(III), demonstrating great potential for use in industrial wastewater treatment.

Article Abstract

Capacitive deionization (CDI) is an evolving technology for eradicating salt and toxic heavy metal ions from brackish wastewater. However, traditional CDI electrodes have lower salt adsorption capacity and inadequate adsorption of selective metal ions for long-term operations. Herein, Ag nanospheres incorporated pomegranate peel-derived activated carbon (Ag/P-AC) was prepared and implied to the CDI process for removing NaCl, toxic mono-, di-, and trivalent metal ions. Morphological analysis revealed that the 80-100 nm-sized Ag nanospheres were uniformly decorated on the surfaces of P-AC nanosheets. The Ag/P-AC has a higher specific surface area (640 m g), superior specific capacitance (180 F g at 50 mV s) and a lower charge transfer resistance (0.5 Ω cm). CDI device was fabricated by Ag/P-AC as an anode, which adsorbed anions and P-AC as cathode for adsorption of positively charged ions at 1.2 V in an initial salt concentration of 1000 mg L. An asymmetric Ag/P-AC//P-AC exhibited a maximum NaCl adsorption capacity of 36 mg g than symmetric P-AC//P-AC electrodes (22.7 mg g). Furthermore, Pb(II), Cd(II), F, and As(III) ions were successfully removed from simulated wastewater by using Ag/P-AC//P-AC based CDI system. These asymmetric CDI-electrodes have an excellent prospect for the removal of salt and toxic contaminants in industrial wastewater.

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Source
http://dx.doi.org/10.1016/j.envres.2021.111110DOI Listing

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