This book presents a wide range of synthesis and characterization techniques to produce ceramic nanomaterials specially developed to be used in environmental applications. The book cover synthesis using hydrothermal, chemical vapor deposition, sol-gel, emulsification, magneto-sputtering, among other process and modern characterization techniques with detail. The use of the synthesized materials in eco-friendly approaches such as phoatalysis, solar energy efficiency improvement, absorbents, sensors, solar cells, biofuels and waste reuse are reported in detail.