在段塞流反应器中通过气液脉冲放电等离子体合成二氧化铈纳米颗粒,ACS Omega

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在段塞流反应器中通过气液脉冲放电等离子体合成二氧化铈纳米颗粒
ACS Omega ( IF 3.7 ) Pub Date : 2021-08-04 , DOI: 10.1021/acsomega.1c02463
Wanying Zhu ₁ , Yingying Lin ₁ , Li Zhu ₁ , Wahyudiono ₁ , Masaki Honda ₂ , Hideki Kanda ₁ , Motonobu Goto ₁

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二氧化铈 (CeO ₂ ) 纳米粒子因其在各种应用中的用途而获得了极大的关注。目前包括水热法和化学沉淀法在内的CeO ₂纳米颗粒的合成方法既耗时又需要化学试剂。为了缩短反应时间并避免使用有机试剂，CeO ₂的新方法提出了通过大气压脉冲放电等离子体在段塞流系统中合成纳米颗粒，该系统在室温下提供了简单、高效和连续的反应。硝酸铈用作进料溶液，并添加淀粉作为稳定剂以分离纳米颗粒的成核和生长过程以防止它们聚集。该系统由交流电源提供的 10.0 kV（峰峰值）高压供电。通过透射电子显微镜 (TEM)、高分辨率 TEM、能量色散 X 射线光谱和紫外-可见光谱对产物进行表征。结果表明，当采用圆形毛细玻璃管盘管作为段塞流反应器时，CeO ₂与使用直玻璃管的情况相比，纳米颗粒增加。尺寸也从 3.4 nm 增加到 6.3 nm。最终阐明了气/液等离子体合成CeO ₂纳米颗粒的机理。

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Synthesis of Cerium Dioxide Nanoparticles by Gas/Liquid Pulsed Discharge Plasma in a Slug Flow Reactor

Cerium dioxide (CeO₂) nanoparticles have gained immense attention owing to their use in various applications. Current synthesis methods for CeO₂ nanoparticles including hydrothermal and chemical precipitation are time-consuming and require chemical reagents. In order to shorten the reaction time and avoid the use of organic reagents, a new method for CeO₂ nanoparticles synthesis in a slug flow system by atmospheric-pressure pulsed discharge plasma was proposed, which provided an easy, efficient, and continuous reaction at room temperature. Cerium nitrate was used as a feed solution, and starch was added as a stabilizer to separate the nucleation and growth processes of the nanoparticles to prevent their aggregation. The system was powered by a high voltage of 10.0 kV (peak-to-peak) from an ac power supply. The products were characterized by transmission electron microscopy (TEM), high-resolution TEM, energy-dispersive X-ray spectroscopy, and UV–vis spectroscopy. The results showed that when a circular capillary glass tube coil was used as the slug flow reactor, the amount of the CeO₂ nanoparticles increased compared to the case when a straight glass tube was used. The size also increased from 3.4 to 6.3 nm. The synthesis mechanism of the CeO₂ nanoparticles by gas/liquid plasma was finally elucidated.

更新日期：2021-08-17

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