MnS formed in the interlayer space of montmorillonite by solid-solid reaction between powders of Mn(II)-montmorillonite and sodium sulfide at an ambient condition. The product was characterized though XRD, Raman, UV-visible and photoluminescence spectroscopies. The formation of sulfide ions to the interlayer manganese cations was indicated by Raman, UV-visible, and photoluminescence spectra. The heat treated product after storage for 4 months exhibited the absorption bands at 314 and 380 nm and the photoluminescence bands at 416 and 435 nm, while no luminescence band was observed for the product after the heat treatment.
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