Preparative Parameters, Magnesium Effects, and Anion Effects in the Crystallization of Birnessites
作者： Jian Luo , Steven L. Suib
DOI: 10.1021/JP9720449
关键词:
摘要: Na-birnessites (Na4Mn14O27·9H2O) have been prepared by aging MnOx gels, whose composition can be represented as MnA·wMgA·xKMnO4·yNaOH·zH2O (A is any of the anions chloride, nitrate, sulfate, and acetate). The effects time, temperature, basicity, amount water, addition Mg2+, ratios MnO4-/Mn2+, types on crystallization birnessite, phase transformations intermediate phases, morphology, ion-exchange properties, thermal stability investigated. XRD (X-ray diffraction), SEM (scanning electronic microscope), EDX (energy dispersive X-ray), IR (Infrared), DSC (differential scanning calorimetry), TGA (thermogravimetric analysis) techniques used. preparative parameters such temperature optimized. Three stages are observed in process birnessite increasing time: an induction period, a fast steady-state per...
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