UV-Vis spectroscopy is one of the most important, yet easy to conduct, characterization techniques to study the optical properties of materials in solutions, colloids or as solids. It is also an essential tool for monitoring the progress of chemical reactions, degradation processes, and water treatment. When applied to the surface of materials it is one of the basic techniques for the evaluation of coatings.

Also, it allows us to optimize photocatalytic processes by matching the appropriate light source with a particular photoactive material.