The goal of CIPOA conference is to gather scientists, scholars, and professionals to present their research findings and discuss future directions and opportunities concerning the fundamentals and application of Advanced Oxidation Technologies in the environmental, energy and climate sectors, towards a sustainable and carbon-neutral circular economy. Early-career scientists are specially invited to participate and enjoy the opportunity of networking with senior scientists, industry professionals, government officials and representative stakeholders from the public community. The meeting is an international forum of discussion on breakthrough science and technology on themes related to advanced oxidation processes (AOPs), electrochemical advanced oxidation processes (EAOPs), high-frequency ultrasound, ozonation processes, and their integration with other physical/chemical and biological processes. Additional topics of interest include techno-economic analysis of industrial and commercial processes for the treatment of soil, water, wastewater, and air. Emerging topics related to wastewater resources recovery, as also organic synthesis, H2 generation and CO2 photoreduction using photocatalytic/electrocatalytic routes are also welcome.