Water pollution by organic pollutants has been a growing global problem in recent years, for which there is a great demand of efficient technologies for wastewater treatment. Remediation of water by photocatalytic oxidation has several advantages over adsorption or any other conventional techniques. This study reports a easy synthesis technique of a sulfur doped hollow TiO₂ nanocatalyst for photo degradation of organic dye under solar light. The hollow doped TiO₂ nano catalyst has significantly high specific surface area (318.11 m² g⁻¹) and low band gap (2.5 eV) compared to that of solid particles (130.94 m² g⁻¹ and 3.2 eV respectively), as a result it acts as an efficient photocatalyst under solar light. The methylene blue dye degradation ability of this catalyst is shown to be 98.6% compared to that of standard Degussa P25 (30%) as reported before. Additionally, the catalyst is also able to degrade 71% methylene blue dye during fifth times recycling without any further treatment because of its high surface area. So our sulfur doped hollow TiO₂ nanoparticles can be used as a potential photocatalyst for environmental remediation applications.