低温常压液相法制备纳米MnO_2

Synthesis of MnO_2 Nanoparticles Using a Liquid Reaction Method under Low-temperatures and Atmospheric Pressures

纳米二氧化锰是一种重要的无机功能材料.本文提出了一种在低温、常压条件下,以KMnO4和HCl为原料,在液相环境中制备纳米二氧化锰的新工艺,研究了反应温度、盐酸浓度、反应物摩尔配比以及反应时间对产物结构及粒径的影响,探讨了反应生长机理,并指出制备纳米δ-MnO2的最佳方案为:反应物盐酸浓度2mol/L,反应物摩尔配比KMnO4∶HCl=1∶8,反应温度60℃,反应时间60min;制备纳米α-MnO2的最佳方案为:反应物盐酸浓度为4mol/L,反应物摩尔配比为KMnO4∶HCl=1∶8,反应温度为80℃,反应时间60min.

Nano-MnO2 is an important inorganic functional material.The paper developed a new synthesis method of liquid-route using KMnO4 and HCl as raw materials.The reaction could proceed under low temperature and atmospheric pressure.As the nano product structures and sizes can be influenced by reaction temperature,HCl concentration,reactant proportion,and reaction time were discussed and the reaction mechanism was analyzed.It was pointed out that the optimum synthesis scheme for nano δ-MnO2 was HCl concentration 2 mol/L,reactant mol proportion KMnO4 ： HCl = 1：8,reaction temperature 60℃,reaction time 60min,and that for nano α-MnO2 was HCl concentration 4 mol/L,reactant mol proportion KMnO4 ： HCl = 1：8,reaction temperature 80℃,and reaction time 60min.