Breakthrough in Nanosheet Technology for Wastewater Purification

Strategic Insights -

Researchers at Sichuan Normal University have made a significant discovery in the field of nanotechnology, creating a novel bifunctional electrocatalyst for the removal of harmful nitrates and sulfides from wastewater. According to the study, published in the Journal of Colloid and Interface Science, the integration of electrochemical nitrate reduction reaction (eNORR) and sulfur oxidation reaction (SOR) can effectively reduce nitrates and sulfides in wastewater.

The research team, led by Yuyue Zhu, College of Chemistry and Materials Science, Sichuan Normal University, developed a cost-effective and high-performance bifunctional electrocatalyst using a trace amount of Pd introduced into Co, N-doped carbon nanosheet arrays anchored on carbon cloth (Pd-Co@NC/CC). This innovative approach achieved a maximum ammonia yield of 500.1 ± 0.8 mmol h cm with a Faraday efficiency of 93.1 ± 1.4 % under alkaline conditions.

The Pd-Co@NC/CC catalyst also exhibited exceptional performance in sulfur oxidation reaction (SOR) with a potential of only 0.22 V at 10 mA cm, substantially lower than the oxygen evolution reaction (OER). Furthermore, the Pd-Co@NC/CC||Pd-Co@NC/CC configuration achieved a potential of only 0.20 V at 10 mA cm for cathodic eNORR and anodic SOR, significantly lower than the coupling of eNORR with OER.

Key Takeaways:

  • The researchers developed a novel bifunctional electrocatalyst using Pd-Co@NC/CC for the removal of harmful nitrates and sulfides from wastewater.
  • The catalyst achieved a maximum ammonia yield of 500.1 ± 0.8 mmol h cm with a Faraday efficiency of 93.1 ± 1.4 % under alkaline conditions.
  • The Pd-Co@NC/CC catalyst showed exceptional performance in sulfur oxidation reaction (SOR) with a potential of only 0.22 V at 10 mA cm.
  • The Pd-Co@NC/CC||Pd-Co@NC/CC configuration achieved a potential of only 0.20 V at 10 mA cm for cathodic eNORR and anodic SOR.
  • The research provides a viable strategy for the resource utilization of nitrate/sulfide-containing wastewater.
  • The Pd-Co@NC/CC catalyst is cost-effective and high-performance, making it a promising solution for wastewater treatment.

Statistics:

  • Maximum ammonia yield: 500.1 ± 0.8 mmol h cm
  • Faraday efficiency: 93.1 ± 1.4 %
  • Potential for sulfur oxidation reaction (SOR): 0.22 V at 10 mA cm
  • Potential for cathodic eNORR and anodic SOR: 0.20 V at 10 mA cm

Sources:

  • Synergy electrocatalysis between palladium and cobalt aligned on carbon nanosheet architectures for nitrate-to-ammonia conversion coupled with sulfur ion oxidation. Journal of Colloid and Interface Science, 2025;701:138688.
  • NewsRx. New Findings from Sichuan Normal University Describe Advances in Nanosheets (Synergy electrocatalysis between palladium and cobalt aligned on carbon nanosheet architectures for nitrate-to-ammonia conversion coupled with sulfur ion oxidation). Nanotechnology Weekly. August 25, 2025; p 1923.