This book comprises a detailed overview on the role of phoatalysts for environmental remediation, hydrogen production and carbon dioxide reduction. Effective ways to enhance the phoatalytic activity of the material via doping, hybrid material, laser light and nanocomposites have been discussed in this book. The book also further elaborates the role of metal nanoparticles, rare earth doping, sensitizers, surface oxygen vacancy, interface engineering and band gap engineering for enhancing the phoatalytic activity. An approach to recover the phoatalytic material via immobilization is also presented. This book brings to light much of the recent research in the development of such semiconductor phoatalytic systems. The book will thus be of relevance to researchers in the field of: material science, environmental science & technology, phoatalytic applications, newer methods of energy generation & conversion and industrial applications.