Preparation and characterization of MnS2/chitosan‑sodium alginate and calcium alginate nanocomposites for degradation of analgesic drug: Photocorrosion, mechanical, antimicrobial and antioxidant properties studies

Abstract

MnS₂, MnS₂/Chitosan‑sodium Alginate (MnS₂/CS-NaAlg) and MnS₂/Chitosan-Calcium Alginate (MnS₂/CS-CaAlg) nanocomposites were prepared via the chemical procedure. The characterization was performed by various instruments such as energy dispersive X-ray spectrometer (EDX), scanning electron microscopy (SEM), X-ray diffraction (XRD) elemental map analysis, Fourier transform infrared spectrometry (FT-IR), Brunauer-Emmett-Teller (BET) surface area measurements, UV-Vis absorption spectra and X-ray absorption spectroscopy. The mean crystallite sizes of MnS₂, MnS₂/CS-NaAlg and MnS₂/CS-CaAlg are 60.12, 71.25 and 74.54 nm, respectively. From Kubelka-Munk equation, the energy band gaps of MnS₂, MnS₂/CS-NaAlg and MnS₂/CS-CaAlg are estimated to be 2.83, 2.71 and 2.41 eV, respectively. The investigation of photocatalysis properties was performed by degradation of tramadol under UV light illumination. The optimum of experimental variables such as pH and time on photo-degradation were found 3 and 60 min, respectively. The results show that the efficiency photocatalysis of MnS₂/CS-NaAlg and MnS₂/CS-CaAlg nanocomposites under was higher than MnS₂. The antibacterial and fungicidal property of MnS₂/CS-NaAlg and MnS₂/CS-CaAlg nanocomposites was investigated and demonstrates good efficiency in antimicrobial efficiency compared to MnS₂. The MnS₂, MnS₂/CS-NaAlg and MnS₂/CS-CaAlg have been shown excellent mechanical and antioxidant properties.

Keywords: Antimicrobial; Chitosan; Nanocomposites; Photocatalysis; UV light.