In Situ Growth of MnO2 on pDA-Templated Cotton Fabric for Degradation of Formaldehyde

Degradation of formaldehyde (HCHO) in interior decoration has been an urgent issue due to its toxicity nature and potential threats to human health. In this work, manganese dioxide nanoparticles (MnO2 NPs) were in situ grown on the polydopamine (pDA)-templated cotton fabrics for environmentally friendly HCHO degradation applications. The morphology, elemental composition, and crystal structure of the cotton/pDA/MnO2 were characterized by scanning electron microscopy-energy dispersive X-ray spectrum (SEM-EDX), Fourier transform infrared (FT-IR), X-ray diffractometer (XRD) and X-ray photoelectron spectroscopy (XPS), respectively. The degradation of HCHO by the as-developed cotton/pDA/MnO2 was measured in a self-made quartz reactor, and the stability of adsorption was evaluated by cyclic experiments. The results showed that the HCHO removal efficiency reached to 100% within 20 min after three cycles, suggesting that the as-prepared fabrics exhibited good stability for the degradation of HCHO. The development of MnO2 NPs coated fabrics provides new strategies in degradation HCHO in interior decoration.

Studies on the Efficient Dual Performance of Lyngbya Majuscula Extract With Manganese Dioxide Nanoparticles in Photodegradation and Antimicrobial Activity

Marine cyanobacteria Lyngbya Majuscula supported manganese dioxide-based novel green nanoparticle synthesised by simple precipitation method. The combination of microscopic and spectroscopic techniques we are using to characterise the synthesised Lyngbya Majuscula with manganese nanoparticles (LmMnO2NPs). The preparation of manganese dioxide nanoparticles is an entirely eco-friendly green synthesis method. The existence of biomolecule-based metal oxides was confirmed using Fourier-transform infrared (FTIR) spectroscopy. The XRD pattern confirms a crystalline nature and polydispersity. The optical transmission 269 nm using commonly used UV spectra and compute the optical band gap values of the material to be approximately 3.71 eV. The photodegradation study reveals manganese dioxide nanoparticles under LED light to 86% degradation within the 150 min of reaction. The standard volume of the synthesised manganese dioxide nanoparticles range was 115.8, and the DLS study confirms the 0.375 polydispersity index value. The green synthesised manganese dioxide nanoparticles obtained from the blue-green algae extract of Lyngbya Majuscula revealed potent antimicrobial activity Pseudomonas aeruginosa, Micrococcus luteus, Aspergillus niger, Staphylococcus aureus, Escherichia coli, and Trichoderma viride. In addition, the biosynthesised manganese dioxide nanoparticles may lead to better activity against the pathogenic microorganisms by the agar well diffusion method.

Biogenic Synthesis of MnO2 Nanoparticles With Leaf Extract of Viola betonicifolia for Enhanced Antioxidant, Antimicrobial, Cytotoxic, and Biocompatible Applications

In this study, we propose to synthesize NPs using plant extract containing active biomedical components, with the goal of obtaining NPs that inherit the biomedical activities of the plant. Herein, we report the synthesis of manganese dioxide nanoparticles (VBLE-MnO2 NPs) using the leaves extract of Viola betonicifolia, in which the biological active plant’s secondary metabolites function as both reducing and capping agents. The synthesized NPs were successfully characterized with different spectroscopic techniques. The antibacterial, antifungal, and biofilm inhibition properties of the synthesized VBLE-MnO2 NPs were further explored against a variety of bacteria (Gram-positive and Gram-negative) and mycological species. Additionally, their antioxidant ability against linoleic acid peroxidation inhibition, cytobiocompatibility with hMSC cells, and cytotoxicity against MCF-7 cells were investigated compared to leaves extract and chemically synthesized manganese dioxide NPs (CH-MnO2 NPs). The results were demonstrated that the synthesized VBLE-MnO2 NPs presented excellent antibacterial, antifungal, and biofilm inhibition performance against all the tested microbial species compared to plant leaves extract and CH-MnO2 NPs. Moreover, they also exhibited significant antioxidant potential, which was comparable to the external standard (ascorbic acid); however, it was higher than plant leaves extract and CH-MnO2 NPs. Furthermore, the synthesized CH-MnO2 NPs displayed good cytobiocompatibility with hMSC cells compared to CH-MnO2 NPs. The enhanced antioxidant, antibacterial, antifungal, and biofilm inhibition efficacy as compared to CH-MnO2 NPs might be attributed to the synergistic effect of the VBLE-MnO2 NPs’ physical properties and the adsorbed biologically active phytomolecules from the leaves extract of V. betonicifolia on their surface. Thus, our study establishes a novel ecologically acceptable route for nanomaterials’ fabrication with increased and/or extra medicinal functions derived from their herbal origins.