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• Facile synthesis of magnetic N -heterocyclic copper(II) complex. • Structural verification of the nanocatalyst by TEM, TG/DTG, FESEM, FTIR, XRD, EDS and VSM analyses. • Catalytic performances of Fe 3 O 4 /SiO 2 -Thiotet-Cu(II) in the 4-NP, CR, MB and Cr(VI) reduction in water. • Catalyst can be reused nine times without any notable decreasing in its catalytic performance. • Antibacterial activity of the Fe 3 O 4 /SiO 2 -Thiotet-Cu(II) nanocatalyst against E. coli and S. aureus. Development of more efficient, low cost and sustainable (nano)catalysts for reduction of various pollutants in water is highly desirable and is still a major challenge. Herein, we report the immobilization of Cu(II)-5-(methylthio)-1 H -tetrazole complex (Thiotet-Cu(II)) on Fe 3 O 4 /SiO 2 superparamagnetic nanoparticles (NPs) through a versatile process and the application of the nanoparticles prepared as highly efficient and recyclable nanospherical catalysts. The as-prepared Fe 3 O 4 /SiO 2 -Thiotet-Cu(II) is used as a recyclable and highly active nanocatalyst in the reduction of hexavalent chromium [Cr(VI)], 4-nitrophenol (4-NP), Congo Red (CR) and Methylene Blue (MB) in aqueous media. The surface nature of Fe 3 O 4 NPs changes after modification, which causes a notable increase in the catalytic prowess and antimicrobial performance. Moreover, the ensuing nanocatalyst remains high reduction efficiency of ~95% after nine cycles without meaningful loss of its efficiency and can be conveniently separated/decanted using an external magnet, demonstrates high recyclability, excellent chemical stability and high potential for practical environmental applications. The present protocol is clean and eco-friendly and does not use any toxic reductants. [ABSTRACT FROM AUTHOR]

• Facile synthesis of amine-modified zeolite stabilized Pd nanocatalyst. • Catalytic performances of Pd NPs@Zeo in the Cr(VI), 4-NP, 2,4-DNPH, NS, MB, RhB and K 3 [Fe(CN) 6 reduction in water. • Characterization of nanocatalyst by TEM, HRTEM, STEM, TG-DTA, FT-IR, XRD, Raman, EDS and XPS. • Nanocatalyst can be recovered and reused eight times without any meaningful decreasing in the catalytic performance. • Antibacterial activity of the Pd NPs@Zeo against E. coli. In this study, the immobilization of palladium nanoparticles (NPs) on amine modified zeolite (Zeo) particles bearing a heterocyclic ligand has been developed through immobilizing structurally defined furfural with long tail of 3-aminopropyltriethoxysilane. NH 2 modified Zeo/Pd has been synthesized via facile multi-step organic amine functionalization as a sustainable, recoverable and highly active nanocatalyst in the reduction of hexavalent chromium [Cr(VI)], potassium hexacyanoferrate(III) (K 3 [Fe(CN) 6), 2,4-dinitrophenylhydrazine (2,4-DNPH), 4-nitrophenol (4-NP), Rhodamine B (RhB), Methylene Blue (MB) and Nigrosin (NS) at ambient temperature in aqueous media. The surface nature of zeolite was changed after NH 2 modification, leading to a remarkable increase in the catalytic and antimicrobial performances. TEM and HRTEM (high resolution transmission electron microscopy), FESEM (field emission scanning electron microscopy), STEM (scanning transmission electron microscopy), TG-DTG (thermogravimetry/derivative thermogravimetry), FT-IR (Fourier transform infrared), XRD (X-ray diffraction), EDS (energy dispersive X-ray spectroscopy), elemental mapping, XPS (X-ray photoelectron spectroscopy) and Raman analyses have been used to characterize the as-prepared nanocatalyst. The high removal rates of these environmental pollutants with NH 2 modified Zeo/Pd nanocatalyst (Pd NPs@Zeo) using sodium borohydride (NaBH 4) and formic acid (HCOOH) at ambient temperature were measured via UV–Vis spectroscopy and the nanocatalyst could be reused at least eight times without any significant loss of catalytic activity. [ABSTRACT FROM AUTHOR]