Visible light-driven Nano-Particles Photocatalyst for Environmental and Health Related Applications

Sasson Yoel (Casali), HUJI, Faculty of Science, The Institute of Chemistry


Environment, Cleantech, Materials, Health, Air & Water Technologies

Development Stage

Proof of concept achieved including prototyping our product

Patent Status

Three published patents


  • In the search for alternative energy sources and environment-friendly sustainable processes there is a growing need for developing photocatalysts that are able to efficiently utilize visible light.
  • Sufficiently stable and practical visible light photocatalytic materials for disinfection and purification of air, water and solid surfaces have not yet been realized.
  • Heterojunctioned Bismuth oxyhalides (common formula BiOXY; X,Y=F, Cl, Br, I) have a semiconducting electron structure that provides remarkable photocatalytic properties to pure oxyhalides as well as to their mixtures with other phases.
  • This invented family of BiO(ClxBr1-x) photocatalysts, with diverse x/1-x molar ratios, demonstrated ten times higher photocapacities in eliminating aqueous Rhodamine B (RhB-an organic dye frequently used as a benchmark in photocatalytic degradation of water pollutants) and other recalcitrant organics under visible light illumination when compared to the commercial Degussa P25 (TiO2).

Our Innovation

New family of bismuth based photocatalysts activated by visible light (with λ>422nm).

Under ambient conditions (humidity and air), our compounds promptly generate reactive oxidation species such as superoxide anion and hydroxyl radicals.


Key Features

  • We have devised a straightforward, cost-effective, recyclable and scalable proprietary fabrication protocol.
  • Substances that exhibit exceptional photocatalytic performances under sun or artificial visible light compared to the individual pure phases and to Degussa P25.

The materials are robust and stable and can be integrated, as thin coatings, on glass or on construction and building materials


Development Milestones

We seek an investment to establish a start-up company and initiate production of photoactive coatings and devices for air and water purification.

The Opportunity

  • For use in air purification and disinfection as well as in water treatment systems.
  • Applied for indoor and outdoor applications particularly in hospitals, residential buildings, malls, schools, airplanes, cars, cooling and air conditioning facilities


Researcher Information: chem.ch.huji.ac.il/applsci/ac/sasson/index.html, chem.ch.huji.ac.il/casali/sasson.htm


Patent Status

Published US 2016/0167991-A1

Granted US 9,943,833; China 201480043734.6; Europe 2,640,666

Contact for more information:

Matt Zarek
Contact ME: