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Abstract
The aim of this study was to find a recycling use for waste material (WTiO2) that results from the extraction process of TiO2 from ilmenite in the pigment industry. In view of its high TiO2 content, the photocatalytic activity of this material was tested in the degradation of humic and fulvic acid substances (HFAs) and showed low levels of photoactivity, as was the case for the commercial photocatalyst Aeroxide TiO2 P25 (P25). However, due to its high Fe3+ content, an important application was observed for WTiO2 as an HFA coagulant and catalyst in Fenton and photo-Fenton processes. A two-stage process of coagulation and photo-Fenton treatment was subsequently designed and conducted at laboratory and small pilot scale. High percentages (above 95%) were obtained in total organic carbon (TOC) removal.
Acknowledgements
The authors acknowledge the financial support for this research from the Spanish Ministry of Science and Innovation (MICINN) under the project FOXMORE (CTM2006-05114) and from the Spanish Ministry of Economy and Competitiveness under the Infrastructure Project UNLP10-3E-726, co-financed with ERDF funds. E. Pulido Melián would also like to thank the University of Las Palmas de Gran Canaria for her postdoctoral contract.