Research

Manganese phosphates in various forms have garnered substantial interest because of their applications in energy storage, catalysis, and materials science. In this study, we present a novel phosphorous acid (H3PO3)-mediated approach for the facile synthesis of MnPO4·H2O and Mn2P2O7 with a unique flower-like morphology. As precursors, KMnO4 and H3PO3 were chosen to hydrothermally synthesize MnPO4·H2O. The crystalline Mn2P2O7 was produced by heating MnPO4·H2O for two hours at 700 °C. XRD, FTIR, FESEM, TEM, and other techniques were used to characterize the materials. The monoclinic structure of MnPO4·H2O and Mn2P2O7 was confirmed by XRD. A possible formation mechanism is proposed, highlighting the role of H3PO3 as both a phosphorus source and a structure-directing agent. The electrochemical study showed that Mn2P2O7 has a specific capacitance of 169 F g−1, whereas that of MnPO4·H2O is 63 F g−1 at a current density of 1 A g−1. This approach provides a straightforward, economical, and scalable pathway to manganese phosphates with a unique morphology, paving the way for a potential future material with enhanced performance in electrochemical and catalytic applications. 

The nano-particles of hematite (alpha-Fe2O3) has so many different properties like magnetism, hydrophilic, non-toxic, high chemical stability, chemical and biological compatibility and high potential in applications of environmental remediation. In this paper, we report the simple, promising, improved synthesis of hematite/alginate nanocomposites and characterized by XRD, SEM, FTIR and UV–visible. Hematite/alginate (AG) beads of diameter 2–3 mm were prepared and used for adsorption/removal of organic dyes like methylene blue. The removal of the 25 ppm MB dye was obtained ~100% within 40 min at pH 9 using 1 g/L hematite/AG beads nanocomposite at room temperature.