Electro-enhanced removal of copper ions from aqueous solutions by capacitive deionization
Journal
Journal of Hazardous Materials
Journal Volume
278
Pages
8-15
Date Issued
2014
Author(s)
Abstract
This study was performed to determine the feasibility of electrosorptive removal of copper ions from aqueous solutions using a capacitive deionization process. The electrosorptive potential of copper ions was determined using cyclic voltammetry measurements, and copper electrodeposition could be suppressed at a voltage less than 0.8V. Importantly, the experimental results demonstrated a significant enhancement of electrosorption capability of copper ions using the activated carbon electrodes under electro-assistance, associated with electrical double-layer charging. At 0.8V, the equilibrium electrosorption capacity was enhanced to 24.57mg/g based on the Langmuir model, and the electrosorption constant rate was increased to 0.038min-1 simulated by a first-order kinetics model. Moreover, the activated carbon electrode showed great regeneration performance for the removal of low level copper ions. Additional experiments regarding electrosorption selectivity were performed in the presence of sodium chloride, natural organic matter, or dissolved silica. Copper ions that were preferentially electroadsorbed on the electrode surface can be effectively removed in a competitive environment. Therefore, the electrosorption process using activated carbon electrodes can be recommended to treat copper solutions at low concentrations for wastewater treatment and water purification. © 2014 Elsevier B.V.
Subjects
Activated carbon electrode; Capacitive deionization; Copper ion; Electrosorption
SDGs
Other Subjects
Activated carbon; Computer simulation; Copper; Cyclic voltammetry; Electrodes; Wastewater treatment; Activated carbon electrode; Capacitive deionization; Capacitive deionization process; Copper electrodeposition; Copper ions; Electrosorption; Regeneration performance; Voltammetry measurements; Metal ions; activated carbon; copper ion; natural organic matter; silicon dioxide; sodium chloride; carbon; copper; solution and solubility; water pollutant; activated carbon; aqueous solution; electrode; ion; pollutant removal; reaction kinetics; sorption; adsorption; aqueous solution; article; capacitive deionization; chemical procedures; conductance; cyclic potentiometry; desorption; electric potential; electrochemical analysis; electrochemistry; electrode; heavy metal removal; ionization; recycling; regeneration; static electricity; surface charge; surface property; waste water management; water management; chemistry; electric capacitance; procedures; sewage; solution and solubility; water pollutant; Adsorption; Carbon; Copper; Electric Capacitance; Electrochemistry; Electrodes; Solutions; Waste Disposal, Fluid; Water Pollutants, Chemical; Water Purification
Type
journal article