Development of a novel method to prepare Fe- and Al-doped TiO <inf>2</inf> from wastewater

Publication Type:
Journal Article
Journal of Industrial and Engineering Chemistry, 2009, 15 (4), pp. 476 - 482
Issue Date:
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A simple and novel method to synthesize iron and aluminium-doped titanium dioxide (TiO 2 ) was investigated. Titanium tetrachloride (TiCl 4 ) was used as a coagulant to remove organic matter from wastewater. The settled floc (sludge) was dewatered and incinerated at 600 °C after TiCl 4 flocculation. The resultant by-product from the waste sludge was valuable TiO 2 . TiCl 4 coagulant was added with FeCl 3 and Al 2 (SO 4 ) 3 coagulants to dope iron and aluminium on TiO 2 in a flocculation process. The effect of iron and aluminium on TiO 2 was investigated in terms of scanning electron microscopy/energy dispersive X-ray (SEM/EDX), X-ray diffraction (XRD), optical absorbance and photocatalytic activity. The majority of Fe/TiO 2 and Al/TiO 2 particles were found to be less than 1 μm size formed by 0.1 μm agglomerates using SEM analysis. Fe/TiO 2 included Ti, O, C, P and Fe elements and Al/TiO 2 consisted of Ti, O, C, P and Al elements as confirmed by EDX results. Remaining organic carbon from the settled organic matter was the source of C atom in TiO 2 whereas the P atom in TiO 2 came from phosphorus nutrient present in wastewater. The majority of acetaldehyde with Fe/TiO 2 and Al/TiO 2 was significantly removed under UV irradiation within 60 min. However, at higher iron concentration, acetaldehyde removal decreased by almost 50%. Under visible light irradiation, the photo-decomposition of acetaldehyde using the Fe/TiO 2 and Al/TiO 2 was marginal. © 2009 The Korean Society of Industrial and Engineering Chemistry.
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