Photocatalytic and adsorption kinetics studies of microwave-assisted bio synthesis of TiO₂ nanoparticles against organic dyes

The present study demonstrates the bio-synthesis of TiO₂ nanoparticles (TiNPs) using the microwave (180 sec, 400 W) technique. Mangifera indica leaf extract is used as a green-reducing agent to produce TiNPs. As synthesized TiNPs have been tested for photocatalytic activity (under 125 W UV and visible) and adsorption kinetics studies against target pollutants such as Evans Blue (EB), Rhodamine B (RhB), and Congo Red (CR). The photocatalytic effectiveness of TiNPs against dye degradation is noteworthy and found maximum degradation efficiency ~93% under UV light in 30 min for EB. The recyclability of TiNPs is analysed and shown up to three cycles of stability. Furthermore, the TiNPs revels good adsorption characteristics that were dependent on pH and temperature. It was discovered that TiNPs had a maximum adsorption capacity of 512.51 mg/g. These TiNPs have potential uses in photocatalytic and adsorption-based aqueous pollutant cleanup. They were made using a straightforward and fast (180 seconds) microwave technique. (author)