Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
7832894 | Applied Surface Science | 2018 | 13 Pages |
Abstract
This work addresses the development of a magnetically extractable magnetite-silica-titania photocatalyst to be applied in the degradation of organic compounds in water. MCM-41 silica was successfully deposited on magnetite, providing large surface area for anchoring of TiOx species, and preventing thermally induced conversion of magnetite to hematite. A good correlation between the calculated values and amount of titania deposited on the silica-covered magnetite particles was obtained for a synthesis route involving the treatment of magnetite-silica in boiling ethanolic Ti-precursor solution. Photocatalytic activity in conversion of 4-chlorophenol could only be observed for compositions containing larger than â¼50â¯wt% titania, whereas increasing the titania content did not significantly improve performance. Experiments carried out at pHâ¯â¼â¯3.0 and â¼7.2 demonstrated the performance is relatively pH-independent. The structure activity-correlation of the materials is briefly discussed.
Keywords
EDXMCM-41 silicaATR-FTIR4-CPMagnetic extractionCTABTEOS4-ChlorophenolROSTetraethylorthosilicatecetyltrimethylammonium bromideX-ray diffractometryEnergy-Dispersive X-ray Spectroscopytitanium isopropoxideTemattenuated total reflectance Fourier transform infrared spectroscopyXRFAdvanced oxidation processX-ray fluorescencePhotocatalysisSEMMagnetiteScanning electron microscopyTransmission electron microscopyTIPXRDTitania coatingReactive oxygen species
Related Topics
Physical Sciences and Engineering
Chemistry
Physical and Theoretical Chemistry
Authors
Alexandre de Oliveira Jorgetto, Alexander Milbrat, José Fabián Schneider, Zheng Li, Guido Giammaria, Margarida Juri Saeki, Thiago Marcelo Ribeiro Gianeti, Giuseppina Pace Pereira Lima, Valber de Albuquerque Pedrosa, Guido Mul, Gustavo Rocha de Castro,