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首页> 外文期刊>RSC Advances >Submicron fibers as a morphological improvement of amorphous zirconium oxide particles and their utilization in antimonate (Sb(v)) removal
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Submicron fibers as a morphological improvement of amorphous zirconium oxide particles and their utilization in antimonate (Sb(v)) removal

机译：亚微米纤维作为非晶锆氧化物颗粒的形态改善及其在锑酸盐中的利用（Sb（V））去除

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摘要

Mesoporous and large surface area zirconium oxide aggregate granules with good adsorption properties were synthesized using a simple precipitation method. Since utilization of these small and fragile particles is considered rather difficult in larger scale column operation, the product was formed into a fibrous form to improve its usability. The submicron fibers were obtained from an optimized electroblowing synthesis that resulted in elastic and uniform fibers with a tetragonal structure and high length-to-diameter ratio. In antimonate (Sb(v)) adsorption experiments, the higher calcination temperature (350 degrees C) of the fibers did not seem to decrease the Sb(v) adsorption capacity excessively since the high theoretical adsorption capacities were 113 mg g(-1) and 58 mg g(-1) for the aggregate and fibers, respectively. Both materials had fast kinetics, fibers being faster in the beginning of the reaction. Moreover, both materials offered efficient Sb(v) removal in the studied pH range from 1 to 11 by reaching over 99.9% adsorption in the optimal pH range. X-ray absorption near edge spectroscopy (XANES) revealed that Sb(v) stays as pentavalent antimony after being adsorbed by these materials and based on the isoelectric point shifts in the zeta potential measurement, adsorption occurs mainly by an inner-sphere complexation reaction. Finally, our study showed that pressure buildup in a flow-through column packed with zirconium oxide fibers was significantly lower than in a column packed with aggregates. Thus, zirconium oxide aggregates can be formed into submicron fibers with enhanced column operation properties without a too large compromise in the adsorption properties.
机译：使用简单的沉淀法合成了具有良好吸附性能的介孔和大表面积氧化锆聚集颗粒。由于在较大尺度柱操作中认为这些小和脆性颗粒的利用相当困难，因此将产物形成为纤维形式以改善其可用性。从优化的电喷合成中获得亚微米纤维，其产生具有四边形结构的弹性和均匀的纤维和高长度至直径比。在锑酸盐（Sb（V））吸附实验中，由于高理论吸附能力为113mg g（-1），纤维的较高煅烧温度（350℃）似乎没有过度降低Sb（V）吸附能力分别为骨料和纤维的58mg（-1）。两种材料都有快速动力学，纤维在反应开始时更快。此外，两种材料通过在最佳pH范围内达到超过99.9％的吸附量，在研究的pH范围内提供高效的Sb（v）除去。边缘光谱（XANES）附近的X射线吸收显示，Sb（V）保持在由这些材料吸附并基于Zeta电位测量中的等电点的偏移后保持偏离锑，其主要通过内球络络合反应发生。最后，我们的研究表明，用氧化锆纤维填充的流通柱中的压力积聚显着低于填充的聚集体中的柱中。因此，氧化锆聚集体可以形成亚微米纤维，具有增强的柱操作性能，在吸附性能下没有过大的折衷。

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  • 来源
    《RSC Advances》 |2019年第39期|共11页
  • 作者

    Lonnrot Satu; Suorsa Valtteri; Paajanen Johanna; Hatanpaa Timo; Ritala Mikko; Koivula Risto;

  • 作者单位

    Univ Helsinki Dept Chem POB 55 FI-00014 Helsinki Finland;

    Univ Helsinki Dept Chem POB 55 FI-00014 Helsinki Finland;

    Univ Helsinki Dept Chem POB 55 FI-00014 Helsinki Finland;

    Univ Helsinki Dept Chem POB 55 FI-00014 Helsinki Finland;

    Univ Helsinki Dept Chem POB 55 FI-00014 Helsinki Finland;

    Univ Helsinki Dept Chem POB 55 FI-00014 Helsinki Finland;

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  • 正文语种 eng
  • 中图分类 化学;
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