Leonardo Palmisano was born in Termini Imerese, Italy, in 1950. He obtained his B.Sc. degree in Chemistry cum laude in1973 from the University of Palermo. He was a full professor of Chemistry in the Department of Engineering, University ofPalermo, since 2000, and although he has now retired, he continues to carry out research. His scientific work mainly focuseson heterogeneous photocatalysis, such as preparation, characterization of many bulk and surface techniques, and testingof various types of bare and doped polycrystalline photocatalysts. He has collaborated with many scientists worldwide,producing joint papers in international journals (~350), many scientific and didactical books, and five patents. He is editorin-chief of the Journal of Photocatalysis and a member of the editorial boards of European Journal of Inorganic Chemistry,Current Organic Chemistry, International Journal of Photoenergy, Journal of Chemistry, and Journal of Membrane Science& Technology. Sedat Yurdakal was born in Birecik, Turkey, in 1977. He received his B.S.c. degree in Chemistry in 2000 from AnadoluUniversity, Turkey. He performed his PhD degree thesis work at the University of Palermo, Italy, and Anadolu Universityfrom 2003 to 2010. He works as a full professor at Afyon Kocatepe University. He has published many papers in prestigiousjournals (>60), a patent, books (and book chapters) in different areas of heterogeneous photocatalysis, such as greenphotocatalytic and photoelectrocatalytic oxidations, remediation of harmful compounds, thin films, photocatalytic reactorapplications, photoadsorption determination, and preparation of new materials containing TiO2. He is associate editor ofthe Journal of Photocatalysis and academic editor of the Journal of Chemistry. He has also been coeditor of special issuesof Catalysis Today