Editorial of special issue for Detlef W. Bahnemann on the occasion of his 70th birthday

In honor of Prof. Dr. Detlef W. Bahnemann's 70th birthday and his distinguished and continuous contributions in semiconductor photocatalysis and nanotechnology, a Special Issue (SI) has been successfully organized, comprising 5 review articles and 34 research articles contributed by his colleagues, collaborators, friends, and former group members from over 30 countries on five continents. It covers the hottest topics in heterogeneous semiconductor photo(electro)catalysis, including novel photocatalysts and photo(electro)catalytic processes, mechanism study, activity evaluation method, applications of photo(electro)catalytic technology for environ-mental remediation, disinfection, solar fuel generation, and CO2 reduction. We highlight the insightful findings in these excellent contributions, and believe that this virtual SI presents the research frontiers in semiconductor photo(electro)catalysis. Additionally, in this Editorial, we provide a comprehensive overview of Prof. Bahne-mann's education, career experiences, and remarkable research achievements.