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In this study, the effect of washing TiO 2  produced from flocculated sludge was investigated. Produced TiO 2  was washed with HCl, NaOH and Milli-Q-water and the washed TiO 2  was then characterized in terms of X-ray diffraction imaging, scanning electron microscope/energy dispersive using X-ray analysis and surface area. Washed TiO 2  was tested for adsorption and photocatalytic oxidation of acetaldehyde, and the decomposition of organics from synthetic wastewater (SWW) in terms of total organic carbon (TOC) and absorbance at UV-254. Results revealed that the anatase structure was dominant and TiO 2  was mainly doped with C atoms. The surface area of TiO 2  generated form TiCl 4  flocculation was found to be twice larger than the TiO 2  generated from Ti(SO 4 ) 2  flocculation. Acid and base washings of TiO 2  improved its photocatalytic ability in decomposing acetaldehyde under UV-irradiation. Similarly, acid, base and Milli-Q water washings of TiO 2  were better in reducing TOC and humic acids from SWW.

Detailed Investigation on the Effect of Washing TiO 2 Prepared from Tisalts Flocculated Wastewater Sludge