Abstract
Electrode material is the key factor for improving the electrochemical performance of capacitive deionization. In this study, a multichannel electrode material derived from soybean straw was prepared by pyrolytic carbonization and dual-activation, characterized, and used as an electrode material in capacitive deionization (CDI) cells to remove sulfate. The results showed that the sulfate adsorption capacity of dual-activated CA-NPSSC-1 of 17.16 mg/g was higher than that of pristine SSC (3.28 mg/g) due to its larger specific surface area, suitable pore structure, superior conductivity, and larger specific capacitance. The electrosorption mechanism of CA-NPSSC-1 electrode included EDL ion storage and pseudocapacitance storage. The EDL contribution and pseudocapacitance contribution were 72.06 % and 27.94 %, respectively, at a scan rate of 5 mV/s. Actual wastewater experiments have shown that the sulfate concentration in mining wastewater was reduced to 158.85 mg/L after recycling treatment, which meets the relevant standards. This work provides new ideas and methods for the treatment of high-salinity mining wastewater.
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