Microwave-assisted surface modification of tio2 nanoparticles for enhanced photocatalytic disinfection

Overview

This technology offers a practical, low-cost method for upgrading commercial TiO2 nanoparticles (P25) into high-performance photocatalytic materials for disinfection. By using microwave-assisted surface modification, the process introduces impurity dopants (such as nitrogen) and alters surface chemistry, enabling strong photocatalytic activity under visible light. The approach avoids expensive exotic synthesis techniques while delivering significant improvements in disinfection performance, dispersion stability, and solution rheology. The result is an affordable, scalable photocatalytic solution suitable for water treatment, pathogen control, and environmental remediation applications.

Technical specifications

Key features:

• Microwave-assisted treatment of commercial Degussa P25 TiO2 in aqueous dopant solutions, enabling dissolution and recrystallization at the nanoparticle surface
• Impurity doping (e.g., nitrogen from ammonia solution) that modifies the electronic band structure and reduces carrier recombination
• Enhanced visible-light photoresponse compared to unmodified P25 TiO2
• Improved surface potential and wettability, leading to better dispersion in aqueous solutions
• Reduced viscosity under shear stress, improving flow and handling characteristics for practical deployment
• Systematic characterization of crystal structure, composition, and optical properties to confirm surface-layer doping
• Quantitative rheological evaluation of dispersion behavior
• Standard photocatalytic disinfection testing to validate efficacy against target microorganisms

How it works:

Microwave irradiation rapidly heats the TiO2-dopant suspension, driving surface dissolution and recrystallization that incorporates dopant atoms into the outer layer of the nanoparticles. This alters the electronic band structure, narrows the effective bandgap for visible-light absorption, and changes the surface charge characteristics. The modified nanoparticles disperse more readily in water and exhibit lower solution viscosity under shear, making them easier to handle in disinfection systems.

Technology readiness level

The underlying microwave-assisted nanomaterial modification capabilities have been extensively demonstrated by the research group, including nanomaterial synthesis, surface modification, rheological characterization, and photocatalyst doping studies. The specific application to Degussa P25 TiO2 for photocatalytic disinfection is at the development and validation stage, with planned tasks covering surface modification, structural and optical characterization, rheological testing, and photocatalytic disinfection evaluation. The technology is positioned for further validation and translational development toward commercial or field-ready disinfection applications.