This book focuses on the investigation of the UV light photocatalytic activity of metal oxide nano-composites for environmental applications. The book provides a comprehensive overview of the synthesis, characterization, and application of metal oxide nano-composites for the degradation of pollutants in wastewater and air.The book covers various metal oxide nano-composites, including TiO2, ZnO, SnO2, and Fe2O3, and their properties, such as morphology, surface area, and bandgap energy, which play a crucial role in photocatalysis.The author also discusses the different factors that influence the photocatalytic activity of metal oxide nano-composites, such as the type of pollutants, pH, temperature, and light intensity.The experimental results presented in the book demonstrate the effectiveness of metal oxide nano-composites in degrading various organic and inorganic pollutants, such as dyes, pesticides, and heavy metals, under UV light irradiation. Also; discusses the challenges and limitations of using metal oxide nano-composites for environmental applications and provides insights into the future development of these materials.Overall, book is a valuable resource for students; researchers, scientists, and engineers working in the field of environmental remediation.