Green synthesis of Au decorated CoFe2O4 nanoparticles for catalytic reduction of 4-nitrophenol and dimethylphenylsilane oxidation

Author(s)

Saire-Saire, Samuel ^[1] ; Barbosa, Eduardo C. M. ^[2] ; Garcia, Daniel ^[2] ; Andrade, Leandro H. ^[2] ; Garcia-Segura, Sergi ^[3] ; Camargo, Pedro H. C. ^[2] ; Alarcon, Hugo ^[1]

Affiliation

^[1] Univ Nacl Ingn, Ctr Dev Adv Mat & Nanotechnol, Av Tupac Amaru 210, Lima 15333 - Peru

^[2] Univ Sao Paulo, Inst Quim, Dept Quim Fundamental, Av Prof Lineu Prestes 748, BR-05508000 Sao Paulo, SP - Brazil

^[3] Arizona State Univ, Sch Sustainable Engn & Built Environm, Nanosyst Engn Res Ctr Nanotechnol Enabled Water T, Tempe, AZ 85287 - USA

• Document type: Journal article
• Source: RSC ADVANCES; v. 9, n. 38, p. 22116-22123, JUL 16 2019.
• Web of Science Citations: 0

Abstract

Gold nanoparticles (Au NPs) have been widely employed in catalysis. Here, we report on the synthesis and catalytic evaluation of a hybrid material composed of Au NPs deposited at the surface of magnetic cobalt ferrite (CoFe2O4). Our reported approach enabled the synthesis of well-defined Au/CoFe2O4 NPs. The Au NPs were uniformly deposited at the surface of the support, displayed spherical shape, and were monodisperse in size. Their catalytic performance was investigated towards the reduction of 4-nitrophenol and the selective oxidation of dimethylphenylsilane to dimethylphenylsilanol. The material was active towards both transformations. In addition, the LSPR excitation in Au NPs could be employed to enhance the catalytic performance, which was demonstrated in the 4-nitrophenol reduction. Finally, the magnetic support allowed for the easy recovery and reuse of the Au/CoFe2O4 NPs. In this case, our data showed that no significant loss of performance took place even after 10 reaction cycles in the oxidation of dimethylphenylsilane to dimethylphenylsilanol. Overall, our results indicate that Au/CoFe2O4 are interesting systems for catalytic applications merging high performances, recovery and re-use, and enhancement of activities under solar light illumination. (AU)

• FAPESP's process: 15/26308-7 - Optimization of the physicochemical properties of nano -structured materials for applications in molecular recognition, catalysis and energy conversion/storage
• Grantee: Roberto Manuel Torresi
• Support Opportunities: Research Projects - Thematic Grants
• FAPESP's process: 15/11452-5 - Hybrid materials composed of oxides and metallic nanoparticles for catalytic and photocatalytic applications
• Grantee: Eduardo César Melo Barbosa
• Support Opportunities: Scholarships in Brazil - Doctorate (Direct)
• FAPESP's process: 17/02854-8 - Synthetic applications of carbamoyl radicals via photocatalysis
• Grantee: Leandro Helgueira de Andrade
• Support Opportunities: Regular Research Grants