Key Words:SEAWATER DESALINATION; TECHNOLOGY; SCIENCE; WATER

Abstract:Carbon-based electrodes in capacitive deionization (CDI) often suffer from limited adsorption capacity and coion effects, which hinder their desalination performance in practical applications. In this study, we developed a novel cross-linked hierarchical porous carbon structure (Fe@CHPC) co-doped with nitrogen (N), sulfur (S), boron (B), and iron (Fe), derived from a biomass-based gel precursor. Fe(NO3)3 and H3BO3 were used as sources of Fe and B, while electrostatic adsorption facilitated the self-assembly of protonated chitosan and lignosulfonate to form the gel. The resulting Fe@CHPC was activated with KOH to achieve a well-designed lamellar structure with multiple pores. The synergistic effects of the heteroatoms and the tailored porous structure significantly enhance CDI performance, achieving a high adsorption capacity of 38.6 mg g- 1 and an average desalination rate of 3.86 mg g- 1 min- 1 at 1.2 V in a 500 mg L- 1 NaCl solution, surpassing the performance of commonly reported activated carbons and other porous carbon electrodes under similar conditions. Furthermore, Fe@CHPC exhibits excellent stability and reusability, maintaining 71 % of its initial electrosorption capacity after 20 cycles, which is crucial for practical desalination applications. This study introduces a promising biomass-derived carbon material for CDI electrodes, offering high desalination efficiency and contributing to the advancement of CDI technology.

Volume:306

Issue:

Translation or Not:no