Preparation of TiO₂ from Recycling Coagulation Sludge and Its Applicability on Photocatalytic Degradation of Dye Acid Red 27

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  • Wang Wei-Fu
    Department of Environmental Engineering, National Chung Hsing University
  • Hu Cheng-Ling
    Department of Environmental Engineering, National Chung Hsing University
  • Hsieh Yung-Hsu
    Department of Environmental Engineering, National Chung Hsing University

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タイトル別名
  • Preparation of TiO<sub>2</sub> from Recycling Coagulation Sludge and Its Applicability on Photocatalytic Degradation of Dye Acid Red 27

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Sludge of coagulation-flocculation treatment is one of most costly and largest quantity products in the wastewater treatment process. In this work, titanium dioxide serves as a sludge reusing product in titanium tetrachloride flocculation process. The effect of TiCl4 on humic acid (HA) coagulation removal in water was investigated. Reprocessing TiO2 photocatalyst was analyzed by surface characterization and photoactivity. The coagulation results showed that the best removal of turbidity and DOC was from the addition 0.14 g/L TiCl4 at pH 3. Titania powder prepared from coagulation sludge showed regular round particles with a dimension of around 15–30 nm. The crystal structure of TiO2 was primary anatase. The primary element states of titania included Ti4+, O2−, and graphitic carbon. Photoactivity test results confirmed that reusing TiO2 showed high dye AR27 photodegradation under acidic conditions with UV light irradiation. TiCl4 coagulant and sludge reusing techniques provide a new concept which could be widely applied to treat waste sludge in the future.

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