Iranian Research Organization for Science and Technology Journal of Particle Science and Technology 2423-4087 4 1 2018 04 29 Fe3O4@ZrO2-SO3H Nanoparticles: A new magnetically retrievable catalyst for esterification of mono- and dicarboxylic acids 1 12 651 10.22104/jpst.2018.2694.1110 EN Parya Tayeb Oskoie Department of Applied Chemistry, Faculty of Science, University of Mohaghegh Ardabili, Ardabil, Iran Yagoub Mansoori Department of Applied Chemistry, Faculty of Science, University of Mohaghegh Ardabili, Ardabil, Iran Journal Article 2017 12 31 In this work preparation of sulfonic acid functionalized magnetite encapsulated zirconia (Fe₃O₄@ZrO₂-SO₃H) has been reported. Structural, chemical, and magnetic properties of the magnetically supported catalyst have also been investigated by Fourier transform infrared (FT-IR) spectroscopy, wide angle X-ray diffraction spectroscopy (WXRD), thermal gravimetric analysis (TGA), energy dispersive X-ray analysis (EDX), transmission electron microscopy (TEM), vibrating sample magnetometer (VSM), Hammett acidity function and pH analysis as well as Brunauer-Emmett-Teller surface area measurement (S_BET). The esterification reaction of various mono- and dicarboxylic acids with different alcohols was chosen to show the nano-catalytic activity. The reaction conditions were optimized and catalyst recovery was also demonstrated. The magnetic catalyst was magnetically separated and reused several times without significant loss of activity.  https://jpst.irost.ir/article_651_55743cc0393b1cb4b8b37d09ae48d097.pdf