Breakthrough in Photocatalytics: Titanium Oxynitride Synthesis

Researchers from Shanghai University have developed a new method for synthesizing high-performance metal oxide photocatalysts using the molten salt method. Their research, published in Dalton Transactions, has demonstrated a significant enhancement in crystallinity and photocatalytic properties of titanium oxynitride (TiON) using the CsCl flux method. The study found that the addition of CsCl during synthesis significantly improved the material quality and photocatalytic activity, leading to a remarkable degradation rate of 77% for methylene blue under visible light irradiation within 120 minutes.

Key Takeaways:

• The molten salt method is a key approach for preparing high-performance metal oxide photocatalysts, but its use in metal oxynitrides remains limited.
• The researchers successfully synthesized titanium oxynitride (TiON) using the CsCl flux method and evaluated its photocatalytic properties.
• The addition of CsCl significantly enhanced the crystallinity of the oxynitrides, reducing defects and improving the overall material quality.
• Specifically, TiON-Cl-Cl, which incorporated CsCl during both precursor synthesis and oxynitride synthesis, exhibited the highest visible-light photocatalytic activity.
• The TiON-Cl-Cl material demonstrated a remarkable degradation rate of 77% for methylene blue under visible light irradiation within 120 minutes, which is approximately 1.97 times higher than that of the CsTiO precursor.
• The reaction rate constant for TiON-Cl-Cl was determined to be 0.00899 min, indicating efficient electron-hole separation and utilization of visible light.
• The researchers' findings open a new direction for high-performance oxynitride synthesis, highlighting the potential of the molten salt method in enhancing the photocatalytic properties of metal oxynitrides.

Statistics:

• 77% degradation rate of methylene blue under visible light irradiation within 120 minutes (TiON-Cl-Cl)
• 1.97 times higher degradation rate compared to CsTiO precursor
• 0.00899 min reaction rate constant for TiON-Cl-Cl

Sources:

• "CsCl-flux synthesis of titanium oxynitride (Ti2.85O4N) for photocatalysis." Dalton Transactions, 2025.
• Royal Soc Chemistry. (www.rsc.org/; pubs.rsc.org/en/journals/journalissues/dt)
• Xie, X., et al. "CsCl-flux synthesis of titanium oxynitride (Ti2.85O4N) for photocatalysis." Dalton Transactions, 2025, 2025.
• Shanghai University. "Reports Findings in Photocatalytics [CsCl-flux synthesis of titanium oxynitride (Ti2.85O4N) for photocatalysis]." Nanotechnology Weekly, May 19, 2025, p 3678.