Metal Oxides explores the multidimensional applications of metal oxides from nanostructured innovations to sustainable solutions. The book begins with the fundamentals of metal oxides, covering aspects such as their structure, synthesis techniques, characterization methods, and surface modification strategies. It expands into nanostructured metal oxide thin films, photocatalytic applications, nanocomposites for energy storage, and nanoengineering approaches to enhance surface reactivity. Sustainable development and environmental impact are also addressed, including green synthesis approaches, life cycle assessment, recycling and reuse strategies, and environmental applications for water purification and remediation. This book is intended for researchers and upper-level students studying materials science, chemistry, nanotechnology, and environmental science.