Zahid, Muhammad Usman, Khan, Muhammad Aslam, Ahmad, Uzair, Alismail, Hanan Abdulaziz, Hussain, Syed Jawad, Khan, Muhammad Irshad, Elshikh, Mohamed Soliman, Ihsan, Junaid, and Bokhari, Syed Ali Imran
Cobalt oxide nanoparticles (Co3O4-NPs) and cobalt sulfide nanoparticles (Co9S8-NPs) have shown extensive potential in electrochemical sensing, catalysis, specific drug targeting, and resonance imaging. However, Co9S8-NPs have been rarely explored for biomedical applications as compared to their oxide counterparts. Thus, in the current study, biocompatible PEGylated Co9S8-NPs and Co3O4-NPs are explored and compared for biological and photocatalytic properties. PEGylation of both the NPs is achieved using a simple chemical co-precipitation method followed by characterization using UV visible spectroscopy (UV-Vis), Fourier transform infrared spectroscopy (FTIR), X-ray diffraction (XRD), scanning electron microscopy (SEM), energy-dispersive X-ray analysis (EDX), and pH-responsive dispersion study. After thorough characterization, the NPs are evaluated and compared for various biological applications including antibacterial, antifungal, antileishmanial, antioxidant, and biocompatibility as well as photo-catalytic dye degradation studies. Both the NPs have shown excellent biological applications; however, Co9S8-NPs exhibit comparatively better antibacterial, antifungal, and antioxidant properties except antileishmanial potential where Co3O4-NPs show slight superiority. Furthermore, Co3O4-NPs indicate a higher degradation potential of methylene blue (MB) up to 46.93%. In comparison, Co9S8-NPs have a degradation ability of up to 42%, at 20 mg/ml within 3 h, which indicates considerable remediation potential of the NPs. Interestingly, both the NPs exhibit non-hemolytic behavior, thus demonstrating a compatible and bio-safe nature of both the NPs. [ABSTRACT FROM AUTHOR]