Rational design of Mg2Sn2O4/rGO/Ag nanocomposites with enhanced photocatalytic and antibacterial activities

Abstract

A Mg2Sn2O4, Mg2Sn2O4/rGO and Mg2Sn2O4/rGO/Ag nanocomposites encompass a new brand of the nanocatalyst, which can be broad-minded to a professional photocatalyst via visible light because of this attractive photocatalytic activity by UV Visible spectroscopy. In particular, Mg2Sn2O4 nanoparticles enclose low bandgap energy consequently enhancing photocatalytic dye degradation. Herewith, these Mg2Sn2O4, Mg2Sn2O4/rGO and Mg2Sn2O4/rGO/Ag nanocomposites were prepared by a hydrothermal method. The Mg2Sn2O4, Mg2Sn2O4/rGO and Mg2Sn2O4/rGO/Ag nanocomposites were tested towards FT-IR, XRD, Raman, DRS UV–Visible spectroscopy and Scanning electron microscopy (SEM) analysis. In FT-IR spectroscopy investigations, Peaks 423 and 548 cm−1 is confirmed to the Mg–O–Mg (M-O-M) and O–Sn–O (O-M-O) groups. The 485, 658, and 750 cm−1 is can be assigned to the Sn–O modes and peaks 578 and 917 cm−1 is corresponds to Mg–O bonds, which was carried out by Raman spectroscopy analysis. The Mg2Sn2O4 nanoparticle's cubic phase of the crystal system was confirmed by XRD studies. Pure Mg2Sn2O4 nanoparticle's observed band gap energies values at 2.7eV. The crystal shape and sheets like morphology were determined by SEM analysis. Mg2Sn2O4, Mg2Sn2O4/rGO and Mg2Sn2O4/rGO/Ag nanocomposites were evaluated by photocatalytic activities under visible light irradiation in presence of Malachite Green dye (MG). Hence, Mg2Sn2O4/rGO/Ag nanocomposites have higher degradation efficiency when compare to the Mg2Sn2O4, Mg2Sn2O4/rGO nanocomposites. Moreover, the Mg2Sn2O4/rGO/Ag nanocomposites was tested to the antibacterial activity with Gram-positive Staphylococcus aureus (S. Aureus) and Gram-negative Salmonella Typhi (S. Typhi) bacteria. Finally, as proposed materials are enhanced to the antibacterial and photocatalytic activities.