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Synthesis of well-crystallized birnessite using ethylene glycol as a reducing reagent |
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| Authors: | Li-Xia Yang Ying-Jie Zhu Guo-Feng Cheng |
| Affiliation: | a State Key Laboratory of High Performance Ceramics and Superfine Microstructure, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai 200050, PR China b Analysis and Testing Center for Inorganic Materials, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai 200050, PR China c Graduate School of Chinese Academy of Sciences, PR China |
| Abstract: | Well-crystallized birnessite sheets containing K+ in the interlayers have been prepared using KMnO4, ethylene glycol and KOH by microwave heating at 90 °C for 10 min. Ethylene glycol was used as a reducing agent. The effect of KOH concentration on the formation of birnessite was studied. The products were characterized by X-ray powder diffraction (XRD), transmission electron microscopy (TEM), thermogravimetric analysis (TG), differential scanning calorimetric analysis (DSC) and Fourier transform infrared (FTIR). Birnessites were converted to cryptomelane upon heating at 400-800 °C and completely collapsed to form Mn3O4 at 1000 °C. |
| Keywords: | A Layered compounds A Oxides B Chemical synthesis |
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