LDH-CO_3-SO_4-Cl晶须的合成及其结构

Synthesis and structural analysis of LDH-CO_3-SO_4-Cl whiskers

以MgSO_4·7H_2O、AlCl_3·6H_2O为原料,Na_2CO_3-NaHCO_3缓冲对为沉淀剂,合成了优质的LDH-CO_3-SO_4-Cl晶须。样品用XRD、SEM、N_2吸附-解吸进行了物相、粒度、晶体形貌结构、热分析和比表面分析。分析了缓冲对体积分数对LDH-CO_3-SO_4-Cl晶须晶形及晶胞参数的影响。结果发现,缓冲对用量在体系中含量的大小对其规整性、板层结构有较大的影响。当缓冲液用量为40%,反应温度T=80℃,反应时间t=148 h时可获得晶形好、板层结构显著、规整性好、分散性好的优质LDH-CO_3-SO_4-Cl晶须。

A fine-quality LDH-CO 3-SO 4-Cl whisker was synthesized via liquid precipitation method using MgSO 4·7H 2O and AlCl 3·6H 2O as raw materials and Na 2CO 3-NaHCO 3 buffer solution as precipitant.The influences of buffer solution concentration on the characteristics of the samples were investigated.Whisker samples were characterized by X-ray diffraction,transmission electron microscopy,and Brunauer-Emmett-Teller N 2 surface area measurements.The results showed that the buffer solution concentration in the system had a greater impact on whisker defined shape.The crystal cell parameter LDH-CO 3-SO 4-Cl whisker with well-defined shape,distinct intercalated structure,regular quality,and well-dispersing capability could be obtained under the following conditions:buffer solution volume ratio of 40%,reaction temperature of 80℃,and reaction time of 148 h.The whisker obtained was well-crystallized and had the morphology of homogeneous and fiber bar.