TY - JOUR
T1 - Magnetically-extractable hybrid of magnetite, mesoporous silica and titania for the photo-degradation of organic compounds in water
AU - Jorgetto, Alexandre de Oliveira
AU - Milbrat, Alexander
AU - Schneider, José Fabián
AU - Li, Zheng
AU - Giammaria, Guido
AU - Saeki, Margarida Juri
AU - Gianeti, Thiago Marcelo Ribeiro
AU - Lima, Giuseppina Pace Pereira
AU - Pedrosa, Valber de Albuquerque
AU - Mul, Guido
AU - Castro, Gustavo Rocha de
PY - 2018/11/1
Y1 - 2018/11/1
N2 - 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 ∼50 wt% titania, whereas increasing the titania content did not significantly improve performance. Experiments carried out at pH ∼ 3.0 and ∼7.2 demonstrated the performance is relatively pH-independent. The structure activity-correlation of the materials is briefly discussed.
AB - 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 ∼50 wt% titania, whereas increasing the titania content did not significantly improve performance. Experiments carried out at pH ∼ 3.0 and ∼7.2 demonstrated the performance is relatively pH-independent. The structure activity-correlation of the materials is briefly discussed.
KW - Advanced oxidation process
KW - Anatase crystal growth
KW - Magnetic extraction
KW - MCM-41 silica
KW - Photocatalysis
KW - Titania coating
KW - 22/4 OA procedure
U2 - 10.1016/j.apsusc.2018.06.218
DO - 10.1016/j.apsusc.2018.06.218
M3 - Article
AN - SCOPUS:85049350814
SN - 0169-4332
VL - 457
SP - 121
EP - 133
JO - Applied surface science
JF - Applied surface science
ER -