KMnO_4与碳球反应制备不同形貌的δ-MnO_2

Synthesis of δ-MnO_2 with Various Morphology by the Reaction of KMnO_4 and Carbon Spheres

采用葡萄糖水热法制备不同大小的碳球,将其与一定浓度的KMn O_4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、KMn O_4浓度、温度对Mn O_2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,并通过进一步的实验进行验证。结果表明,低浓度的KMn O_4溶液与小碳球反应可以得到花状Mn O_2产物,而与大碳球反应会得到空心结构的Mn O_2球;高浓度的KMn O_4溶液与碳球反应会得到实心结构的Mn O_2球;温度对Mn O_2产物形貌没有显著的影响。

Carbon spheres with different sizes were synthesized by a hydrothermal method using glucose and water. Then single-factor contrast experiments about the size of carbon spheres, the concentration of KMn O_4 and the temperature of the reaction were carried out to investigate the effect of these factors on the morphology of the Mn O_2 products. Kirkendall effect is effective to interpret the results, and a series of replication experiments were performed. Results show that flower-like Mn O_2 can be fabricated through the reaction of low-concentration KMn O_4 and small-sized carbon spheres. The hollow-sphere-structure Mn O_2 can be obtained by the reaction of low-concentration KMn O_4 and big-sized carbon spheres. The porous solid-structure Mn O_2 corresponds to high-concentration KMn O_4, whatever size the carbon spheres are. Temperature is not a notable factor.