Nanoparticulate Au catalysts are active under mild conditions, even at ambient temperature or less, and this makes them unique. Further, use of mixed precious metal-semiconductor catalysts can produce even higher activities than the use of Au alone. Hence, with an attempt to extend light absorption of semiconductor based photocatalyst (TiO₂) towards visible light range and eliminate the rapid recombination of excited electrons/holes during photoreaction, here Au-TiO₂ photocatalyst were prepared by deposition-precipitation using NaOH for photocatalytic degradation of azo dye (Acid Red 88; AR 88). The materials were characterized and the superiority of Au-TiO₂ photocatalyst over bare TiO₂ particles for the photocatalytic degradation of AR 88 is explained. Mineralization of target pollutant was also performed by Total Organic Carbon (TOC) analysis and a suitable mechanism is proposed for photodegradation of AR88 in the presence and absence of electron acceptors [Peroxomonosulfate (PMS), Peroxodisulfate (PDS) & Hydrogen peroxide (H₂O₂)] to prove Au-TiO₂ is a better photocatalyst for advanced oxidation technologies (AOTs).