LAUSR

Creating three-dimensional (3D) ultralight metal oxide using cost-effective precursors and facile approaches is important. Here, shape-controlled γ-MnOOH (density lower than 0.078 g cm−3) with a continuously 3D porous network (3D-γ-MnOOH) was successfully fabricated with KMnO4, MnCl2 and NaOH via hydrothermal treatment and freeze-drying. The hydrothermal condition and the amount of reactants were systematically investigated, and the optimal procedure occurs at 180°C for 10 h with the molar ratios of NaOH/KMnO4 and MnCl2/KMnO4 as 5.0 and 3.5, respectively. Owing to the low density, 3D network, and the filling of air inside the channel, the new γ-MnOOH can float on the water for at least 4 months with complete structure. The formation and floating mechanism of the 3D-γ-MnOOH were also explored. This new 3D-γ-MnOOH could be utilized in oil absorption.摘要超轻三维多孔金属氧化物材料在许多应用中起着重要作用, 因此采用低成本的材料和简便的方法制备它们显得非常重要. 本文以 高锰酸钾、 氯化锰和氢氧化钠为原料, 结合水热合成法和冷冻干燥法首次制备出超低密度(<0.078 g cm−3)、形状可控和连续多孔的三维 氢氧化氧锰(3D-γ-MnOOH). 系统地研究了反应物添加量和水热反应时间对3D-γ-MnOOH合成过程的影响, 得出制备3D-γ-MnOOH 的最 优工艺条件: NaOH/KMnO4和MnCl2/KMnO4的摩尔比分别为5.0和3.5, 水热温度和时间分别为180°C和10 h. 由于γ-MnOOH具有低密度和 充满空气的三维孔道结构, 使其可以在水中漂浮4个月以上, 并保持微结构不变. 分析探讨了3D-γ-MnOOH的微结构形成机制和漂浮机理. 超轻3D-γ-MnOOH的成功制备将促进其在吸油、 储能、 催化剂载体等领域的应用.