Due to the significant importance in modern electronic devices and chemical products manufacture, considerable copper ions have been discharged into the global environment, which requires an effective way to remove and recover. Many conventional techniques have been explored, such as solvent extraction, ion exchange and precipitation. It has been demonstrated that electrodeposition is a promising way to recover copper ions as metallic products, however, it is difficult to directly use electrodeposition for copper recovery in acidic low-concentration copper-containing wastewater due to the performance of inefficient and time-consuming with low-quality products. To achieve efficient separation in the dilute wastewater system, a new stepwise method of electro-sorption and electrodeposition was proposed in this study. Initially, the ACF/CoS had been readily prepared as the low-cost and stable electrode, presenting excellent properties of a larger specific surface area of 33.2 m2/g and specific capacitance of 141.2 F/g at 5 mV/s. It can effectively recovery copper ions by electro-sorption method within 90 min, and the copper ion was concentrated from 30 mg/L to 500 mg/L after desorption and concentration process. Subsequently, it was connected to the turbulent reactor for enhanced electrodeposition, to overcome the bottlenecks of concentration polarization. The results showed that under the voltage of 0.25 V and the current density of 150 A/cm2, the recovery of copper ion can reach 99%, and the energy consumption was only 1.35×10?2 kW/h, which was 50% and 15% lower than the traditional electrodeposition and enhanced electrodeposition under the voltage of 0.40 V. Consequently, with the efforts of the effective electrode and improved mass transfer, the joint method of electro-sorption and electrodeposition exhibits a good prospect for the efficient treatment of low concentration metal wastewater and the recovery of low concentration metal ions.
HU Mei-Qing
,
JIN Wei
. Separation of low-concentration copper ions via the joint effect of electro-sorption and electrodeposition[J]. The Chinese Journal of Process Engineering, 2021
, 21(8)
: 976
-984
.
DOI: 10.12034/j.issn.1009-606X.220188