Green synthesis of TiO2 and its photocatalytic activity

摘要: Abstract Titanium dioxides (TiO2) have been the fascinated nanomaterials for majority of numerous promising uses (solar cells, self-cleaning, gas sensors, deodorization, antifogging, and wastewater remediation) due to their superhydrophilic property. Having binary metal oxide composition, TiO2 is found in three different polymorphs that are named as anatase, rutile, brookite. Each morph has its characteristic bandgap energies with rutile (3.0 eV), anatase (3.2 eV), brookite (3.2 eV). extensive use semiconductors environmental photocatalysis via absorption sunlight decompose organic pollutants. A number methods available green synthesis. Recently, production methodology a profitable emerging process low cost, quick, environment-friendly. In concern toxicity high processes (physical chemical), synthesis highly appreciated biogenic or biocompatible sources. Phytochemicals (polyphenols) containing polar nonpolar groups plant material often play key role reductants capping agents these processes. view this, present chapter summarized comprehensive data on environmentally benign fabrication nanoparticles from biological extracts (plant microbes) photocatalytic applications TiO2. Highly used semiconductor-assisted degradation pesticides, dyes, polyaromatic hydrocarbons, other pollutants detailed. Degradation pathways under reaction conditions itself modified drawn. The mechanism was mainly based generation free electrons holes conduction valance band regions, leading formation oxidative species.