The adsorption and desorption processes of Zn(Ⅱ) on γ-MnOOH as a function of particle concentrations(C p) were studied. An obvious C p effect was observed in this adsorption system. The degree of adsorption hyster...The adsorption and desorption processes of Zn(Ⅱ) on γ-MnOOH as a function of particle concentrations(C p) were studied. An obvious C p effect was observed in this adsorption system. The degree of adsorption hysteresis increased greatly with the increasing of C p, indicating that the extent of the real metastable-equilibrium states deviating from the ideal equilibrium state was enhanced with the increasing of C p. The C p-reversibility relationship confirmed the metastable-equilibrium adsorption(MEA) inequality(Pan, 1998a), which was the core formulation of the MEA theory. Because the MEA inequality was based on the basic hypothesis of MEA theory that adsorption density Γ is not a state variable, the C p-reversibility relationship gave indirect evidence to the basic hypothesis of MEA theory.展开更多
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...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/KMnO_4和MnCl_2/KMnO_4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.展开更多
文摘The adsorption and desorption processes of Zn(Ⅱ) on γ-MnOOH as a function of particle concentrations(C p) were studied. An obvious C p effect was observed in this adsorption system. The degree of adsorption hysteresis increased greatly with the increasing of C p, indicating that the extent of the real metastable-equilibrium states deviating from the ideal equilibrium state was enhanced with the increasing of C p. The C p-reversibility relationship confirmed the metastable-equilibrium adsorption(MEA) inequality(Pan, 1998a), which was the core formulation of the MEA theory. Because the MEA inequality was based on the basic hypothesis of MEA theory that adsorption density Γ is not a state variable, the C p-reversibility relationship gave indirect evidence to the basic hypothesis of MEA theory.
基金supported by the National Natural Science Foundation of China (U1510202)the National Key R&D Program (2016YFC0204000)Jiangsu Province Scientific Supporting Project (BK20170046)
文摘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/KMnO_4和MnCl_2/KMnO_4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.
