Textbook in PDF format This reference text covers the fundamentals and applications of various types of photocatalyst materials, including metal oxides, rare earth doped oxides, phosphor coupled metal oxides, nanocomposites and perovskite/metal organic frameworks for wastewater treatment and the hydrogen evolution process. An introduction to photocatalysts and their applications Rare-earth-doped metal oxide photocatalysts for wastewater treatment Composite nanostructures based on metal oxide/upconversion phosphors with improved photocatalytic activity Nanocomposites and their applications in photocatalytic degradation processes Photocatalysts for hydrogen evolution Photocatalysis for organic degradation using perovskite materials Emerging trends and future prospects in photocatalysis-based environmental remediation and hydrogen production