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Abstract Ridha Djellabi

In any given catalytic application, material design is the core key to control the effectiveness, selectivity and stability of the process. Ultrasonic cavitation provides extraordinary condition combining shock wave physical effect, high pressure and extreme local heat, high speed micro-jets and produced reactive oxygen species (ROS). This tool has been applied over decades in many fields including environmental, food industry, synthesis, cleaning and disinfection, energy production and medical/biomedical related applications. The focus of this talk will be on the application of ultrasonic cavitation tool for synthesis of photocatalytic materials, by emphasizing the fundamental concept and related research studies. Ultrasonic cavitation can control the size of nanoparticles, materials porosity, and it is used to desig of composites with special interfacial bonding. A case research study on the fabrication of TiO2 coated biomass with specific Ti-O-C interfacial bridge will be discussed in depth. The role of ultrasonic cavitation to build this interfacial bridge and its importance for enhanced visible light harvesting and charges separation will be explained. On top to the unique effects of ultrasonic synthesis, this tool is relatively low cost and it could be alternative to organic solvents or/and convocational heat, fitting the sustainable development aspects.

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