Ag nanoparticle immobilized mesoporous TiO2-cobalt ferrite nanocatalyst: A highly active, versatile, magnetically separable and reusable catalyst. (October 2017)

• Record Type: Journal Article
• Authors: Ghosh, Barun Kumar; Moitra, Debabrata; Chandel, Madhurya; Lulla, Harshita; Ghosh, Narendra Nath
• Is Part Of: Materials research bulletin. Volume 94(2017)
• Page Start: 361
• Page End: 370
• Publication Date: 2017-10
• Subjects: Inorganic compounds -- Magnetic materials -- Chemical synthesis -- Catalytic properties; Materials -- Periodicals; Crystal growth -- Periodicals; Matériaux -- Périodiques; Cristaux -- Croissance -- Périodiques; Crystal growth; Materials; Periodicals; 620.11
• DOI: 10.1016/j.materresbull.2017.06.015
• Languages: English
• ISSNs: 0025-5408

Abstract

Graphical abstract: Highlights: Synthesis of magnetically separable Ag nanoparticle loaded mTiO2 @CoFe2 O4 catalysts. Efficient catalyst for epoxidation, photocatalysis and reduction of 4- nitrophenol. Easy magnetic separation of catalyst and good reusability of recovered catalyst. Abstract: Here, a simple method for preparation of a novel nanocatalyst, composed of Ag nanoparticle, mesoporous TiO2 and CoFe2 O4 nanoparticle, has been reported for three important reactions (i) epoxidation of styrene, (ii) reduction of 4-nitrophenol (4-NP) and (iii) photocatalytic degradation of Methylene Blue dye. The synthesized catalyst exhibited high catalytic activities towards all of these three reactions. For styrene epoxidation, ∼98.1% conversion of styrene with ∼94.5% selectivity of styrene oxide was observed within 10 h. This catalyst catalyzed the reduction of 4-nitrophenol within 4 min with kapp = 1.08 min −1 . The catalyst also showed complete photodegradation of Methylene Blue within 60 min under visible light exposure. The catalyst was easily recovered from the reaction mixture by applying a permanent magnet externally. The recovered catalyst also showed excellent reusability. Easy synthesis methodology, versatile catalytic activity, easy separation and good reusability make this nanocatalyst attractive in the field of heterogeneous catalysis.