Sulfonic acid supported on hydroxyapatite-encapsulated-γ-Fe2O3 nanocrystallites as a magnetically separable catalyst for one-pot reductive amination of carbonyl compounds

Acid functionalized carbon–silica composite and its application for solketal production

“…In order to take advantage of the positive aspects of liquid acids and solid acids, the method of immobilization of liquid acids onto the solid support, viz. sulfonation of activate carbon or metal oxides, came into practice in recent years that provides high acid functionality bearing solid materials for catalytic applications [5][6].…”

Facile synthesis of Fe3O4/SiO2/molecularly imprinted hydroxyapatite nanocomposite and its enhanced photocatalytic degradation of target contaminant

“…Magnetic separation provides a simple and effective method for removing and recycling magnetic particles from the treated water by external magnetic field. The accommodation of magnetic nanocrystallites into HAP matrix has been reported by several researchers and used as a high-performance heterogeneous catalyst [4][5][6]. The core-shell Fe 3 O 4 /HAP nanoparticles have been successfully prepared and used as photocatalysts for photocatalytic degradation of organics in our previous report [7,8].…”

Silica-coated magnetic NiFe2O4 nanoparticles-supported H3PW12O40; synthesis, preparation, and application as an efficient, magnetic, green catalyst for one-pot synthesis of tetrahydrobenzo[b]pyran and pyrano[2,3-c]pyrazole derivatives

“…This strategy has enabled research groups to overcome problems with the separation and recycling of homogeneous catalysts [4][5][6][7][8][9][10]. Thus, in this study, an efficient magnetic supported acid catalyst NiFe 2 O 4 @SiO 2 -H 3 PW 12 O 40 (NFS-PWA) was prepared by chemical support of Keggin HPA on silica-coated NiFe 2 O 4 magnetic nanoparticles.…”