KMnO4与碳球反应制备不同形貌的δ-MnO2

The Fabrication of δ-MnO2 with Various Morphology via The Reaction Between Carbon Spheres and KMnO4

摘要:

通过葡萄糖水热法制备不同大小的碳球,将其与一定浓度的KMnO₄在一定温度下反应,通过多组单因子实验分别探究碳球大小、KMnO₄浓度、温度对MnO₂产物形貌的影响。之后通过柯肯达尔效应对结果进行了解释,并通过进一步的验证性实验得出如下的结论：低浓度的KMnO₄溶液与小碳球反应可以得到花状MnO₂产物,而与大碳球反应会得到空心结构的MnO₂球；高浓度的KMnO₄溶液与碳球反应会得到实心结构的MnO₂球；温度对MnO₂产物形貌没有显著的影响。

Abstract:

Carbon spheres with different sizes has been synthesized through a hydrothermal method using glucose and water. Then single-factor contrast experiments about the size of carbon spheres, the concentration of KMnO₄ and the temperature of the reaction were carried out to probe into the effect of these factors on the morphology of the MnO₂ products. Kirkendall Effect is an effective theory to interprete the result, and though a series of replication experiments, we came to the final conclusion: The flower-like MnO₂ can be fabricated through the reaction of low-concentration KMnO₄ and small-size carbon spheres; The hollow-sphere-structure MnO₂ can be obtained by the reaction of low-concentration KMnO₄ and big-size carbon spheres; The porous solid-structure MnO₂ corresponds to high-concentration KMnO4, whatever size the carbon spheres are; Tempetature is not a notable fator.