Characterization and preparation of a novel silicon-zirconium composite by a co-precipitation approach
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摘要: 以氧氯化锆和硅酸钠的盐溶液为原料,采用共沉淀法制备了硅-锆复合的新型除氟材料(Si-Zr),利用SEM、FTIR和XRD分析了其表面形态和内部结构特征,并研究了相关的制备参数对材料除氟性能的影响。结果表明,600℃高温焙烧条件下的新型Si-Zr表面孔隙结构发达,比表面积大,有利于材料对氟离子的吸附; 材料中 Zr与Si以Si—O—Zr复合氧化物的形态结合,其性质结构稳定,对氟离子吸附后不易脱附。在制备参数中,焙烧温度、硅与锆摩尔比和焙烧时间对材料除氟性能的影响较大。Abstract: A novel silicon-zirconium (Si-Zr) composite adsorbent was prepared via co-precipitation approach. The surface morphology and chemical structure of the prepared Si-Zr composites were characterized by SEM, FTIR and XRD. The influence of synthesis conditions on the performance of defluorination was observed and evaluated. The results show that with 600℃ of calcination temperature, the Si-Zr composites exhibits blooming porous structure and large specific surface, which benefits the absorption of aqueous fluoride. Zirconium and silicon in the material are combined as Si—O—Zr composite oxides. Additionally, the prepared composites can bond stably with fluoride anion and are resistive in desorption. The comprehensive experiments reveal that calcination temperature and time, ratio of raw material (ZrOCl2∶Na2SiO3) dominate the application performance of the Si-Zr composites.
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