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首页> 外文期刊>ISIJ international >Synthesis of Magnetite Particles by Oxidation of Hydroxyl-chloride Green Rust Suspension under Controlled Conditions
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Synthesis of Magnetite Particles by Oxidation of Hydroxyl-chloride Green Rust Suspension under Controlled Conditions

机译：受控条件下氢氧化氯化物绿锈悬浮液的氧化合成磁铁矿颗粒

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摘要

Magnetite (Fe_3O_4) particles were synthesized by oxidation of a hydroxyl chloride green rust (GR(CI-)) suspension at room temperature. The formation process of Fe_3O_4 particles was characterized by X-ray diffraction, magnetization and electrochemical measurements. The results showed that a small amount of fine Fe_3O_4 particles were nucleated when the supernatant solution of the as-synthesized GR(CI-) suspension was replaced by deaerated water. By controlling the injection of oxygen gas at room temperature, Fe_3O_4 particles of about 70 nm in diameter formed from such GR(CI-) suspension, while goethite (α-FeOOH) particles were mainly obtained from the as-synthesized GR(Cl-) suspension under the same oxidation conditions. Hence, the saturation magnetization of final oxidation products obtained from the GR(Cl-) suspension in which the supernatant solution was replaced was about 60 emu/g, which was six times larger than that obtained from the as-synthesized GR(CI-) suspension. In the early stage of the oxidation process, the oxidation-reduction potential (ORP) in the GR(CI-) suspension in which supernatant solution was replaced was lower than that in the as-synthesized GR(CI-) suspension. In addition, the value of pH of the former suspension was higher than that of the latter suspension. It is concluded that the formation of Fe_3O_4 particles is enhanced in solution with relatively low ORP and high pH.
机译：磁铁矿（Fe_3O_4）颗粒是通过在室温下氧化羟基氯化物绿锈（GR（CI-））悬浮液而合成的。通过X射线衍射，磁化和电化学测量表征了Fe_3O_4颗粒的形成过程。结果表明，用脱气水置换合成的GR（CI-）悬浮液的上清液时，少量的Fe_3O_4细颗粒成核。通过在室温下控制氧气的注入，由这种GR（CI-）悬浮液形成直径约70 nm的Fe_3O_4颗粒，而针铁矿（α-FeO​​OH）颗粒主要由合成后的GR（Cl-）获得在相同的氧化条件下悬浮。因此，从替换了上清液的GR（Cl-）悬浮液中获得的最终氧化产物的饱和磁化强度约为60 emu / g，这是从合成后的GR（CI-）中获得的六倍大。悬挂。在氧化过程的早期阶段，替换了上清液的GR（CI-）悬浮液的氧化还原电位（ORP）低于合成的GR（CI-）悬浮液的氧化还原电位。另外，前一种悬浮液的pH值高于后一种悬浮液的pH值。结论是，在具有相对较低的ORP和高pH的溶液中，Fe_3O_4颗粒的形成得以增强。

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  • 来源
    《ISIJ international》 |2013年第5期|894-899|共6页
  • 作者

    Aya YOSHINO; Shun FUJIEDA; Kozo SHINODA; Shigeru SUZUKI;

  • 作者单位

    Institute of Multidisciplinary Research for Advanced Materials, Tohoku University, Katahira 2-1-1, Aoba-ku, Sendai, 980-8577 Japan;

    Institute of Multidisciplinary Research for Advanced Materials, Tohoku University, Katahira 2-1-1, Aoba-ku, Sendai, 980-8577 Japan;

    Institute of Multidisciplinary Research for Advanced Materials, Tohoku University, Katahira 2-1-1, Aoba-ku, Sendai, 980-8577 Japan;

    Institute of Multidisciplinary Research for Advanced Materials, Tohoku University, Katahira 2-1-1, Aoba-ku, Sendai, 980-8577 Japan;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    magnetite; green rust;

    机译：磁铁矿;绿锈;

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