Fig. 1: Characterization of synthesized siderite.
From: Transformation of siderite to goethite by humic acid in the natural environment
a Representative SEM images of the synthesized siderite obtained through hydrothermal reaction at 130 °C for 4 h, and the more highly magnified SEM images of an individual microsphere (b) and its surface morphology (c); d representative TEM (inset of d) and HRTEM (d) of the nanoparticle on the surface of synthesized siderite; e the XRD pattern of the synthesized siderite, where the inset is the schematic diagram of the siderite unit cell structure, which was drawn by use of Diamond 3.2 software (Crystal Impact GbR, Germany); f the FTIR spectra of synthesized siderite.
