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以葡萄糖和高锰酸钾为原料, 采用溶胶-凝胶法合成了 birnessite (K1.35MnO2, 简写为 Bir) 和 cryptomelane (K0.27MnO2, 简写为 Cry) 型氧化锰; 采用 X 射线衍射、原子吸收光谱等考察了凝胶处理方法、反应物浓度比、焙烧温度和反应时间等对氧化锰晶型的影响. 结果表明, 采用不同方法处理凝胶可实现对 Bir 和 Cry 型氧化锰的可控合成. ...
Transformation of Synthetic Birnessite to Cryptomelane: An Electron Microscopic Study
Birnessite Cryptomelane Selected area diffraction Structural disorder Synthesis Thermal treatment Transmission electron diffraction
2012/1/12
Na-saturated birnessite was synthesized by oxidizing an alkaline MnCl2 solution with gaseous O2. Transmission electron microscopy (TEM) showed no morphological change upon K-saturation of the birnessi...