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

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Journal Article
Journal of Industrial and Engineering Chemistry, 2009, 15 (4), pp. 476 - 482
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A simple and novel method to synthesize iron and aluminium-doped titanium dioxide (TiO2) was investigated. Titanium tetrachloride (TiCl4) was used as a coagulant to remove organic matter from wastewater. The settled floc (sludge) was dewatered and incinerated at 600 °C after TiCl4flocculation. The resultant by-product from the waste sludge was valuable TiO2. TiCl4coagulant was added with FeCl3and Al2(SO4)3coagulants to dope iron and aluminium on TiO2in a flocculation process. The effect of iron and aluminium on TiO2was 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/TiO2and Al/TiO2particles were found to be less than 1 μm size formed by 0.1 μm agglomerates using SEM analysis. Fe/TiO2included Ti, O, C, P and Fe elements and Al/TiO2consisted 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 TiO2whereas the P atom in TiO2came from phosphorus nutrient present in wastewater. The majority of acetaldehyde with Fe/TiO2and Al/TiO2was 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/TiO2and Al/TiO2was marginal. © 2009 The Korean Society of Industrial and Engineering Chemistry.
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