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Manufacturing of Photoactive β -Bismuth Oxide by Flame Spray Oxidation
Journal of Thermal Spray Technology ( IF 3.2 ) Pub Date : 2021-03-21 , DOI: 10.1007/s11666-021-01182-2
M. T. Ayala-Ayala , M. Y. Ferrer-Pacheco , J. Muñoz-Saldaña

Photoactive tetragonal bismuth oxide powder with different semiconducting characteristics was synthesized from Bi-pellets by flame spray oxidation. The effect of feedstock particle size and standoff distance (SOD) on the physical properties of β-Bi2O3 keeping constant the fuel/oxygen ratio is here reported. The flame spray oxidized powder was collected either from evaporated or in-flight particles quenched in water. The combination of flame spray processing parameters led to different β-Bi2O3 phase contents, oxidation characteristics, size distribution (nanometric and micrometric sized), morphology, and optical properties of the sprayed powder. The highest micrometric β-Bi2O3 content quenched in water was obtained at a SOD of 30 cm using a particle size distribution of 12-60 μm of Bi-feedstock. The obtained powder from in-flight particles collected in water allowed us to analyze the oxidation characteristics of bismuth. Micrometric powder shows the synthesis of snowman-like Bi/β-Bi2O3 Janus particles. The nanometric sized Bi2O3 powder was continuously obtained by spray oxidation, where its collection efficiency depends on processing parameters and showed spherical morphology and a highly pure tetragonal phase with narrow visible light absorbance (Eg = 2.26 eV). These optical characteristics indicate that the obtained β-Bi2O3 powder is suitable for high-performance visible-light photocatalyst.



中文翻译:

火焰喷涂氧化法制备光敏性β-铋氧化物

通过火焰喷涂氧化法,由Bi-球团合成了具有不同半导体特性的光敏四方氧化铋粉末。本文报道了原料粒度和支座距离(SOD)对保持燃料/氧气比恒定的β- Bi 2 O 3物理性能的影响。从水中淬火的蒸发或飞行中颗粒中收集火焰喷雾氧化的粉末。火焰喷涂工艺参数的组合导致不同的β- Bi 2 O 3相含量,氧化特性,尺寸分布(纳米和微米级),形态和喷涂粉末的光学性能。最高的微米β使用Bi进料的12-60μm粒度分布,在30 cm的SOD下获得了在水中淬灭的-Bi 2 O 3含量。从水中收集的机载颗粒获得的粉末使我们能够分析铋的氧化特性。微米级粉末节目雪人状的Bi /合成β -Bi 2 ö 3的Janus颗粒。通过喷雾氧化连续获得纳米级的Bi 2 O 3粉末,其收集效率取决于工艺参数,并显示出球形形态和具有窄可见光吸收率的高纯四方相(E g= 2.26 eV)。这些光学特性表明,所获得的β- Bi 2 O 3粉末适用于高性能可见光光催化剂。

更新日期:2021-03-22
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