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<p>The escalating demand for drinking water, driven by population growth, necessitates the development of advanced technologies and materials for water purification, with about 2.5% of the water on Earth being fresh. An inventive method of water treatment for desalination and ion removal is capacitive deionization (CDI), addressing the challenges posed by salinity and heavy metal contamination. In the present work, we investigate the application of molybdenum disulfide (MoS<sub>2</sub>) nanosheets as electrode material in a CDI device for the removal of NaCl and arsenic species from aqueous solutions. The MoS<sub>2</sub> nanosheets were synthesized via a hydrothermal method, possessing a porous structure conducive to effective ion adsorption. Electrochemical analysis reveals specific capacitance values of 20.2, 17.6, and 15.2 F g<sup>−1</sup> for NaCl, As(V), and As(III) solutions, respectively, indicating the robust ion removal capability of the prepared MoS<sub>2</sub> nanosheets. In CDI experiments, substantial reductions in conductivity, concentration, and total dissolved solids (TDS) were observed within 5&#xa0;min of treatment for all contaminants, regardless of the applied potential. We have also performed isotherm studies showing maximum achievable electrosorption capacities of  ~124.87&#xa0;mg&#xa0;g<sup>−1</sup> for NaCl,  ~45.85&#xa0;mg&#xa0;g<sup>−1</sup> for As(V), and  ~36.23&#xa0;mg&#xa0;g<sup>−1</sup> for As(III). This study validates the effectiveness of MoS<sub>2</sub>-based CDI device for sustainable water treatment solutions, proving its capability beyond theoretical models. </p>

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MoS2 nanosheet electrodes for capacitive deionization-based water purification

  • 期刊论文

  • 发表日期：

    2025年10月2日

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  • Rajesh Kumar,
  • Vikash Yadvendu,
  • Rohit Kumar Gupta,
  • Ashish Kumar Mishra

摘要

The escalating demand for drinking water, driven by population growth, necessitates the development of advanced technologies and materials for water purification, with about 2.5% of the water on Earth being fresh. An inventive method of water treatment for desalination and ion removal is capacitive deionization (CDI), addressing the challenges posed by salinity and heavy metal contamination. In the present work, we investigate the application of molybdenum disulfide (MoS2) nanosheets as electrode material in a CDI device for the removal of NaCl and arsenic species from aqueous solutions. The MoS2 nanosheets were synthesized via a hydrothermal method, possessing a porous structure conducive to effective ion adsorption. Electrochemical analysis reveals specific capacitance values of 20.2, 17.6, and 15.2 F g−1 for NaCl, As(V), and As(III) solutions, respectively, indicating the robust ion removal capability of the prepared MoS2 nanosheets. In CDI experiments, substantial reductions in conductivity, concentration, and total dissolved solids (TDS) were observed within 5 min of treatment for all contaminants, regardless of the applied potential. We have also performed isotherm studies showing maximum achievable electrosorption capacities of  ~124.87 mg g−1 for NaCl,  ~45.85 mg g−1 for As(V), and  ~36.23 mg g−1 for As(III). This study validates the effectiveness of MoS2-based CDI device for sustainable water treatment solutions, proving its capability beyond theoretical models.