以Mg(NO3)2?6H2O为镁源, Al(NO3)3?9H2O为铝源, 采用水热法制备了高分散的镁铝层状双氢氧化物MgAl-LDH, 并高温煅烧生成MgAl-LDO。利用场发射 扫描电子显微镜(FE-SEM)、X射线衍射(XRD)、透射电子显微镜(TEM)、傅里叶变换红外光谱(FTIR)、X射线光电子分析(XPS)、氮气吸附-脱附法对产物进行表征 分析, 并且探讨了其吸附机理。结果表明, 2种产物的吸附过程对比于Langmuir吸附模型基本一致, 其中MgAl-LDO的比表面积更大, 吸附性能更好, 对甲基橙 的最大吸附量可达925.9 mg?g-1。吸附机制包括化学作用、氢键、静电作用和表面络合作用。

Using Mg(NO3)2?6H2O as the magnesium source and Al(NO3)3?9H2O as the aluminum source, a highly dispersed magnesium-aluminum layered double hydroxide MgAl-LDH was prepared by hydrothermal method and calcined to generate MgAl-LDO. The product was characterized and analyzed by Field emission scanning electron microscope (FE-SEM), X-ray diffraction (XRD), transmission electron microscope (TEM), Fourier transform infrared spectroscopy (FTIR), X-ray photoelectron analysis (XPS), nitrogen adsorption-desorption method, and its adsorption mechanism was discussed. The results show that the adsorption process of the two products is basically the same as the Langmuir adsorption model. Among them, the specific surface area of MgAl-LDO is larger and the adsorption performance is better. The maximum adsorption capacity of methyl orange can reach 925.9 mg?g-1. Adsorption mechanisms include chemical interaction, hydrogen bonding, electrostatic interaction, and surface complexation.