Hexagonal hematite platelets synthesized from pyrite cinders by hydrothermal process
Hexagonal hematite platelets synthesized from pyrite cinders by hydrothermal process
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DOI：
10.1007/s11771-011-0849-5
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发表时间：
2011-10
影响因子：
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通讯作者：
Zhao-cheng Liu;Yajie Zheng
中科院分区：
文献类型：
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作者：
Zhao-cheng Liu;Yajie Zheng
以高浓度氢氧化铁为前驱体，采用水热法合成了结晶良好的六方赤铁矿(α-Fe_2O_3)晶片。以硫酸浸出硫铁矿烧渣为原料，在硫酸铁水溶液中加入氨水制备前驱体。用X射线衍射仪、扫描电子显微镜、透射电子显微镜和选区电子衍射仪对合成产物的结构和形貌进行了表征。结果表明，反应温度对合成的赤铁矿粒子的结构、大小和形状有显著影响。在2 30℃下反应0.5h，可制得直径约0.4~0.6μm、厚度约0.1μm的典型六方赤铁矿晶片，其中的杂质Al3+在六方赤铁矿的形成中起着极其重要的作用。此外，还提出了六方赤铁矿小片形成的可能机制。
Well-crystallized hexagonal hematite (α-Fe2O3) platelets were synthesized by hydrothermal process, using a highly concentrated ferric hydroxide as precursor. The precursor was prepared by adding ammonia to the ferric sulfate solution which was obtained by leaching pyrite cinders with sulfuric acid. Structure and morphology of the synthesized products were investigated by X-ray diffraction, scanning electron microscope, transmission electron microscope and selected area electron diffraction. The results reveal that the reaction temperature has significant effects on the structure, size and shape of the synthesized hematite particles. Typical hexagonal hematite platelets, about 0.4–0.6 μm in diameter and 0.1 μm in thickness, were prepared at 230 °C for 0.5 h. Al3+, contained in the sulfuric acid leaching solution as an impurity, plays an extremely important role in the formation of hexagonal hematite. In addition, a possible mechanism about the formation of hexagonal hematite platelets was proposed.