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Green synthesis is a simple, cost-effective, and long-term method of manufacturing nanoparticles that is now attracting scientific attention across the world. The major goal of this research is to make green titanium dioxide nanoparticles and evaluate their efficacy in photocatalytic treatment of Tannery effluent. To test the treatment of hexavalent chromium from tannery effluent, TiO2 nanoparticles were produced from lemon peel extract The TiO2 nanoparticles were evaluated using a Particle Size Analyzer, which revealed that the particle size was 21.94 nm and the Zeta Potential was -27.5 mV. Field Emission Scanning Electron Microscopy (FESEM), X-beam Diffractometer (XRD), Fourier Transform Infrared (FT-IR), spectroscopy, surface region analyzer, and UV-Visible Spectrophotometer were additionally used to do promote portrayal. The nano size and anatase part of the circular TiO2 nanoparticles were approved by the outcomes. Furthermore, the green synthesized TiO2 nanoparticles were used to evaluate their ability to remove chromium (VI). UV (Ultra Violet) photocatalytic reactors with wavelengths of 365nm were used to accomplish photocatalytic degradation for periods of 30, 60, 90, 120, and 150 minutes The maximum removal of hexavalent Chromium from Tannery effluent was about 76 percent after 150 minutes of contact time with green synthesized TiO2 nanoparticles. As a result, it was effectively used for wastewater treatment. [ABSTRACT FROM AUTHOR]