Magnetically-extractable hybrid of magnetite, mesoporous silica and titania for the photo-degradation of organic compounds in water

Author(s):Show less -

Jorgetto, Alexandre de Oliveira ^{[1, 2]} ; Milbrat, Alexander ^[2] ; Schneider, Jose Fabian ^[3] ; Li, Zheng ^[2] ; Giammaria, Guido ^[4] ; Saeki, Margarida Juri ^[1] ; Ribeiro Gianeti, Thiago Marcelo ^[5] ; Pereira Lima, Giuseppina Pace ^[1] ; Pedrosa, Valber de Albuquerque ^[1] ; Mul, Guido ^[2] ; de Castro, Gustavo Rocha ^[1]

Affiliation

^[1] Univ Estadual Paulista UNESP, Dept Quim & Bioquim, IB, Caixa Postal 510, BR-18618000 Botucatu, SP - Brazil

^[2] Univ Twente, Fac Sci & Technol, MESA Inst Nanotechnol, Photocatalyt Synth Grp, Meander 229, POB 217, NL-7500 AE Enschede - Netherlands

^[3] Univ Sao Paulo, IFSC, BR-13566590 Sao Carlos, SP - Brazil

^[4] Univ Twente, Fac Sci & Technol, MESA, Catalyt Proc & Mat, POB 217, NL-7500 AE Enschede - Netherlands

^[5] Univ Estadual Paulista UNESP, Lab Cent, FCA, Caixa Postal 1780, BR-18610307 Botucatu, SP - Brazil

• Document type: Journal article
• Source: Applied Surface Science; v. 457, p. 121-133, NOV 1 2018.
• Web of Science Citations: 1

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 similar to 50 wt% titania, whereas increasing the titania content did not significantly improve performance. Experiments carried out at pH similar to 3.0 and similar to 7.2 demonstrated the performance is relatively pH-independent. The structure activity-correlation of the materials is briefly discussed. (AU)

• FAPESP's process: 15/05224-0 - Synthesis of silica-titania and silica-titania-magnetite hybrids and their functionalization and sensitization with Fe3+ ions for the photodegradation of 4-chlorophenol under UV and visible light
• Grantee: Alexandre de Oliveira Jorgetto
• Support Opportunities: Scholarships abroad - Research Internship - Doctorate
• FAPESP's process: 13/22955-2 - Synthesis of silica-titania and silica-titania-magnetite hybrids and their functionalization and sensitization with Fe3+ ions for the photodegradation of 4-chlorophenol under UV and visible light
• Grantee: Alexandre de Oliveira Jorgetto
• Support Opportunities: Scholarships in Brazil - Doctorate