Nanostructured enhanced photocatalyst are more attractive compared to standard semiconductors and this book is devoted to the many novel production techniques and uses of advanced TiO2 and ZnO-based photocatalysts. Specifics on synthesis, characterization, and reaction applications of nanostructured photocatalysts are highlighted. Other new technology discussed in this book is the harvesting of microalgae for biofuel production. Contributors to this book are leading researchers in Photocatalysis. The book serves not only as a text for research into photochemistry and photocatalysis, but also explores the field of biofuel and green technologies.