UV-visible spectrophotometry in modern research: applications in adsorption, photocatalysis, catalytic reduction, sensing nanomaterials, and drug delivery.

UV-visible (UV-vis) spectrophotometry is a cornerstone analytical technique widely utilized in modern scientific research due to its simplicity, rapid response, and quantitative reliability. This review presents a comprehensive overview of the application of UV-vis spectroscopy in major research domains, such as photocatalysis, adsorption processes, catalytic reduction reactions, optical tuning using noble-metal nanomaterials, drug loading and release systems, and chemical/biological sensing. This technique plays a crucial role in monitoring concentration changes; it also evaluates reaction kinetics and characterizes functional materials through their optical properties. In photocatalysis and catalytic reduction, UV-vis spectrophotometry enables the real-time tracking of pollutant degradation and conversion reactions. In adsorption studies, it provides insights into adsorption capacity and isotherm modeling. Additionally, the unique surface plasmon resonance (SPR) of noble metal nanoparticles is effectively studied using UV-vis spectroscopy. The method is also extensively applied in drug delivery systems to quantify the loading and release efficiency of systems, as well as in sensing applications for the selective detection of analytes. Recent advancements like integration with nanotechnology and portable systems have further enhanced its capabilities. This review highlights the current trends, challenges, and future prospects, which provide a clear and scientifically robust resource for researchers.