Professor Dionysiou performs research in the fields of:-
- Advanced oxidation technologies for water treatment,
- drinking water treatment and purification,
- physicochemical phenomena on particle-water interfaces,
- transition-metal oxidation and reverse electron transfer reactions,
- the use of ionic liquids in environmental applications,
- destruction of biological toxins in water,
- And environmental nanotechnology (fundamental, fate, transport, and applications of nanomaterials).
- Advanced Unit Operations for the Treatment of Drinking Water and Wastewater,
- Physical-Chemical Processes for Water Quality Control,
- Advanced Oxidation Technologies and Nanotechnologies.
- He also teaches a graduate level laboratory course on Unit Operations and Process Monitoring for the Treatment of Polluted Water and Air and an undergraduate course in Environmental Engineering Fundamentals and Process Design.