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Updated: May 16, 2025

Ion-Exchange Membranes for the Fabrication of Reverse Electrodialysis Device
Published on: July 20, 2021
A novel magnetic adsorption and capacitive deionization coupled technology for industrial saline wastewater recycling
Shuo Wang1, Hongjie Wang2, Xinyuan Huang1
1Hebei Key Laboratory of Close-to-Nature Restoration Technology of Wetlands, School of Eco-Environment, Hebei University, Baoding 071002, China.
Abstract:
The cost-effective desalination technologies were urgent needed to recycle industrial saline wastewater, desalinate seawater and brackish water. Deionisation techniques based on the adsorption principle usually suffer from low adsorption capacity of the adsorbent, susceptibility to contamination, regeneration difficulties and secondary contamination. In this paper, the magnetic reduced graphene oxide (mrGO) was successfully prepared as magnetic media, and a novel magnetic adsorption deionization and capacitive deionization coupled system (MDI-CDI) was constructed, in which a superposition magnetic field with consistent direction was formed by the internal additional magnetic field of magnetic media and the external magnetic field. The relationship between various salt solutions, initial concentration, operation patterner and deionization effect were investigated by KCl solution to optimize the MDI system. The actual petrochemical circulating wastewater (0.933 mS/cm), were adopted to investigate the magneto-electric coupling effect of MDI-CDI system, the average desalination rate and COD removal were 96.9 % and 84.8 %, respectively. In addition, the three-stage tandem MDI system was adopted to investigate the enhanced magnetic adsorption deionization effect, which was 79.3 % of catalytic cracking wastewater (37.4 mS/cm) and 84.0 % of petrochemical wastewater (3.68 mS/cm), respectively. The results indicate that the main deionization mechanisms of MDI system were enhanced by a superimposed magnetic field, including physical adsorption, magnetic attraction, electrostatic attraction, and surface complexation/deposition effects. The MDI-CDI coupled deionisation system can mitigate membrane contamination, regenerate online without secondary pollution under low-consumption, high-efficiency and stable state, providing a new technological idea for the regeneration and utilization of saline wastewater.
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