Tungstate supported on magnetic ionic liquid-modified graphene oxide as an efficient and recyclable catalyst for the selective oxidation of sulfides. (March 2022)

• Record Type: Journal Article
• Authors: Dabiri, Minoo; Tavil, Hassan Esmaielie; Lehi, Noushin Farajinia; Movahed, Siyavash Kazemi; Mnachekanian Salmasi, Aram; Souri, Sepideh
• Is Part Of: Journal of physics and chemistry of solids. Volume 162(2022)
• Publication Date: 2022-03
• Subjects: Graphene -- Tungstate -- Magnetic -- Ionic liquid -- Oxidation; Solids -- Periodicals; Solides -- Périodiques; Solids; Periodicals; 530.41
• DOI: 10.1016/j.jpcs.2021.110497
• Languages: English
• ISSNs: 0022-3697

Abstract

Abstract: An effective and recyclable catalyst based on tungstate ion immobilization on magnetic ionic liquid modified graphene oxide (WO4 @Fe3 O4 /GO-IL) has been synthesized in this research. The catalyst was characterized by various techniques such as Raman spectroscopy, X-ray diffraction, thermogravimetric analysis, electron microscopy transmission and scanning, and vibrating sample magnetometer. Also, for the selective oxidation of sulfides to the corresponding sulfoxides, the as-synthesized catalyst was investigated. Additionally, the WO4 @Fe3 O4 /GO hybrid was used to study the role of ionic liquid in this transformation and, the observed yield of methyl phenyl sulfoxide was remarkably inferior. Also, by using an external magnet, the catalyst can be quickly retrieved and recycled successfully in five following reaction cycles without any significant reduction in activity and selectivity of the catalyst. Graphical abstract: Image 1 Highlights: A novel magnetic graphene oxide supported ionic liquid/tungstate complex (WO4 @Fe3 O4 /GO-IL) was synthesized. This nanomaterial was used as an efficient heterogeneous catalyst for the oxidation of sulfoxide. The recoverability, reusability and stability of the catalyst were also studied under applied conditions.