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In situ green synthesis of MnFe 2 O 4 @EP@Ag nanocomposites using Epilobium parviflorum green tea extract: An efficient magnetically recyclable catalyst for the reduction of hazardous organic dyes
Author(s) -
Gürbüz Mustafa Ulvi,
Koca Murat,
Elmacı Gökhan,
Ertürk Ali Serol
Publication year - 2021
Publication title -
applied organometallic chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.53
H-Index - 71
eISSN - 1099-0739
pISSN - 0268-2605
DOI - 10.1002/aoc.6230
Subject(s) - chemistry , rhodamine b , nuclear chemistry , fourier transform infrared spectroscopy , nanocomposite , catalysis , nanoparticle , silver nanoparticle , scanning electron microscope , transmission electron microscopy , methyl orange , analytical chemistry (journal) , chemical engineering , nanotechnology , photocatalysis , organic chemistry , materials science , engineering , composite material
The present paper introduces a plant‐mediated green synthesis of highly stable MnFe 2 O 4 @EP@Ag magnetically recyclable nanocomposites (MRNCs) using Epilobium parviflorum (EP) tea extract as a coating material on MnFe 2 O 4 nanoparticles (NPs) for the Ag immobilization. Fourier transform infrared spectroscopy‐attenuated total reflectance (ATR‐FTIR) studies confirmed the presence of the polyphenolics in EP extract, including tannic, gallic, and other derivatives, which can enhance the complexation properties with silver ions on MnFe 2 O 4 NPs. Thus, the capacity and the surface properties of the resulting nanosorbent (MnFe 2 O 4 @EP) can also improve their ability to form magnetic nanocatalyts without using any additional chemicals, toxic or extra‐reducing agents. The transmission electron microscopy (TEM) verified the successful coating of EP extract on MnFe 2 O 4 core as a 5 nm shell. X‐ray diffraction (XRD) patterns and scanning electron microscope/energy‐dispersive X‐ray spectroscopy (SEM–EDX) confirmed the presence of both MnFe 2 O 4 and crystalline silver nanoparticles in the core‐shell structure of the MnFe 2 O 4 @EP@Ag MRNCs. The obtained MnFe 2 O 4 @EP@Ag MRNCs displayed high efficiency and catalytic activity for the reduction of various azo dyes like methyl orange (MO), methyl red (MR), congo red (CR), alizarin yellow (AY), nitro aromatic compound, 4‐Nitrophenol (4 NP), and a common tracer, rhodamine B (RhB). Results displayed that the MnFe 2 O 4 @EP@Ag MRNCs revealed higher catalytic activity with the normalized rate constant ( k nor ) of 350.47 s −1 g −1 for RhB reduction. Furthermore, they were highly efficient in the reduction of other azo dyes and nitro compound in the order of MO (85.51 s −1 g −1 ) > CR (70.09 s −1 g −1 ) > 4 NP (62.15 s −1 g −1 ) > AY (54.67 s −1 g −1 ) > MR (46.73 s −1 g −1 ). In addition, the MnFe 2 O 4 @EP@Ag MRNCs exhibited an excellent unchanged recovery efficiency even after several cycles; therefore, they can be good potential candidates for the treatment of organic pollutants in wastewater and a wide range of applications in heterogeneous catalysis.