Removal of sodium isopropyl xanthate by capacitive deionization process

Abstract

This study investigated the removal of sodium isopropyl xanthate (SIPX) by capacitive deionization using an ion exchange resin/PVDF electrode. The electrode was prepared by coating a layer of ion exchange resin (Amberlite FPA54) and polyvinylidene fluoride (PVDF) on the carbon electrode. Batch experiments demonstrated that 96% of SIPX was removed through electrosorption and electrochemical advanced oxidation processes at 1 V. Carbon disulfide (CS2) was generated as a by-product of the xanthate oxidation. Adsorption/desorption cycle tests revealed that the ion exchange resin/PVDF electrode has high adsorption capacity, and the maximum adsorption could not be achieved within 60 min of adsorption times. The total xanthate removed in the final adsorption stage of eight cycles was 323 mg/m2, corresponding to 34.1% of xanthate from a 20 mg/L xanthate solution that flowed 0.4 mL per min at 1 V for 60 min of adsorption. At the end of the 30 min. desorption, 32.1% of the adsorbed xanthate was released back into the solution and oxidized to CS2, which was adsorbed by the electrodes in the following adsorption stage. The percentage of the concentrate flow at the end of the desorption stage was 33%. The findings of the study suggest that CDI is a promising tool for the mining industry. However, further research is needed to evaluate its efficiency for specific mining applications.

Keywords

• Capacitive Deionization (CDI)
• Electrochemical Advanced Oxidation Processes (EAOPs)
• Flotation
• Residual Xanthate
• Water Treatment

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