摘要： The present study explored the Photocatalytic & antibacterial activity of Mesoporous Mn and S co-doped TiO2 nano material synthesized by sol-gel method. As prepared samples were characterized by X-ray diffraction (XRD), X-ray photo electron spectroscopy(XPS), Scanning electron microscopy (SEM), Energy dispersive X-ray Spectroscopy(EDX), Fourier transform infrared spectroscopy(FT-IR), UV-Visible Diffused Reflectance Spectroscopy(UV-Vis-DRS),Transmission electron Microscopy(TEM), Brunauer-Emmett-Teller (BET) and Photoluminescence (PL).The Characterization results revealed that all the co-doped and undoped samples shows anatase phase. The Frequency shift of Ti-O-Ti in the catalyst samples was observed in FT-IR due to substitutional doping of Mn and S by replacing Ti and O, Further the catalyst shows smooth spherically shaped small particle size (7.6 nm) with high surface area (155.87 m2/g) and having less band gap energy (2.58 eV). The most reactive ?OH are produced during the progress of reaction was determined by using Photo luminescence (PL) technique. The photocatalytic efficiency and antibacterial activity was evaluated by degradation of Indigo carmine(IC), Bacillus coagulans and klebsiella pneumonia respectively. The complete degradation of IC was achieved at optimum reaction parameters such as 0.150g of the catalyst dosage, solution pH=4 and initial dye concentration 20ppm with the catalyst of 1.0Wt% of Mn-0.25Wt% of S co-doped Titania with in 90 min. The zone of inhibition bacterial growth was observed (24mm and 23mm) compared to control value (Chloramphenicol) 25mm and 24mm.