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The purpose of the study was to effectively treat algae bloomed water while using a Ti-based coagulant (TiCl₄) and recover photoactive novel anatase TiO₂ from the flocculated sludge. Conventional jar tests were conducted in order to evaluate the coagulation efficiency, and TiCl₄ was found superior compared to commercially available poly aluminum chloride (PAC). At a dose of 0.3 g Ti/L, the removal rate of turbidity, chemical oxygen demand (COD), and total phosphorus (TP) were measured as 99.8%, 66.7%, and 96.9%, respectively. Besides, TiO₂ nanoparticles (NPs) were recovered from the flocculated sludge and scanning electron microscope (SEM), energy dispersive X-ray spectroscope (EDX), and X-ray diffraction (XRD) analysis confirmed the presence of only anatase phase. The recovered TiO₂ was found to be effective in removing gaseous CH₃CHO and NO_x under UV-A lamp at a light intensity of 10 W/m². Additionally, the TiO₂ mixed mortar blocks that were prepared in this study successfully removed atmospheric nitrogen oxide (NO_x) under UV irradiance. This study is one of the first to prepare anatase TiO₂ from flocculated algal sludge and it showed promising results. Further research on this novel TiO₂ concerning internal chemical bonds and shift in the absorbance spectrum could explore several practical implications.