Manganese Oxides: Synthesis and Application as Adsorbents of Heavy Metal Ions

Biologically-induced synthetic manganese carbonate precipitate (BISMCP) for potential applications in heavy metal removal

“…This software demonstrated a typical FT-IR spectrum of biologically-induced mineralization of MnCO 3 , as shown in Fig. 2 The spectral peaks in MCP-4 to MCP-9 centered at 1420.90 cm −1 , 865.67 cm −1 , and 717.91 cm −1 are related to C O binding and are known to be the typical peaks of rhodochrosite material or MnCO 3 [ 29 , 41 , 50 , 80 , 86 ]. The broader peak at 3452.24 cm −1 correlated to O–H binding and N–H binding, which were related to the characteristics of the hydroxyl and amino groups and could be attributed to sugars, carboxylic acids, nucleic acids, or amino acids [ 26 ].…”

Understanding the role of manganese oxides in retaining harmful metals: Insights into oxidation and adsorption mechanisms at microstructure level

“…[ 113 ] discovered that the adsorption capacity of Tl + onto birnessite was greater at pH = 6 than pH = 2, attributed to birnessite's more negative charge near neutral pH, enhancing Tl affinity. Higher Cr(VI) production from Cr(III) oxidation by birnessite at pH 2.0 and 3.0 compared to pH 4.0 and 5.0 is due to surface charge alterations below PZC, birnessite dissolution at pH ≤ 3.5, and increased redox potential of birnessite at low pH [ 36 , 240 ].…”

“…The MnO 6 octahedra connect via edge-sharing to form single chains, producing Mn oxides with diverse structures through edge- and/or corner-sharing [ 33 ]. Based on the stacking arrangement of MnO 6 octahedra, the Mn oxides are typically classified into two categories: layered structure (i.e., phyllomanganate) and tunneled structure (i.e., tectomanganate) [ [34] , [35] , [36] ]. The layered structure comprises layers of edge-sharing MnO 6 octahedra, with symmetry dependent on the Mn(III) octahedra distribution.…”

Nanoremediación: Alternativa a la Contaminación Minera en México

“…Además del Hierro de Valencia Cero a Nanoescala (nZVI), se han utilizado otros materiales como los nanotubos de carbón (CNTs); el dióxido de titanio nanocristalino (TiO2); las Nanoarcillas; así como las Nanopartículas (NPs), entre las que destacan las de óxido de hierro (-Fe2O3), las de óxido de circonio (am-ZrO2), las de plata (nAg), y las de Goethita (-FeOOH) (Luo et al, 2021;Marcon et al, 2021;Nicomel et al, 2016). También se le ha dado relevancia a la nanoremediación mediante algunos Óxidos de Manganeso como la Magnetita (Fe3O4) que es señalada como una nanopartícula con excelentes resultados en la regulación de la concentración de Zn, Cd y Cu en el agua (Flores-Guia et al, 2021). A estos materiales se unen las Nanopartículas a base de sulfuro de Hierro (nFeS), debido a "su capacidad de inmovilizar metales doble-Valentes" (Borja-Borja et al, 2020).…”