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大规模合成具有氧空位的多孔Bi2O3用于有效降解亚甲基蓝
WangLiangbing
State Key Laboratory for Powder Metallurgy, School of Materials Science and Engineering, Central South University, Changsha 410083, China
Abstract:
Photocatalytic degradation of organic pollutants has become a hot research topic because of its low energy consumption and environmental-friendly characteristics. Bismuth oxide (Bi2O3) nanocrystals with a bandgap ranging between 2.0-2.8 eV has attracted increasing attention due to high activity of photodegradation of organic pollutants by utilizing visible light. Though several methods have been developed to prepare Bi2O3-based semiconductor materials over recent years, it is still difficult to prepare highly active Bi2O3 catalysts in large-scale with a simple method. Therefore, developing simple and feasible methods for the preparation of Bi2O3 nanocrystals in large-scale is important for the potential applications in industrial wastewater treatment. In this work, we successfully prepared porous Bi2O3 in large scale via etching commercial BiSn powders, followed by thermal treatment with air. The acquired porous Bi2O3 exhibited excellent activity and stability in photocatalytic degradation of methylene blue (MB). Further investigation of the mechanism witnessed that the suitable band structure of porous Bi2O3 allowed the generation of reactive oxygen species, such as O2-? and ?OH, which effectively degraded MB.
Key words:  Bi2O3 photocatalyst  Photocatalytic degradation  Large scale  Visible light  Photocatalysis
FundProject:
Supplymentary:   Wang-Bi2O3-Photocatalytic_degradation_of_MB-4-1-2020-with_mark.doc
Large-Scale Synthesis of Porous Bi2O3 with Oxygen Vacancies for Efficient Photodegradation of Methylene Blue
王梁炳
中南大学材料科学与工程学院粉末冶金国家重点实验室,湖南 长沙 410083
摘要:
光催化降解有机污染物由于其具有低能耗和绿色环保的特点,已经成为研究的热点。氧化铋(Bi2O3)纳米晶体的带隙在2.0-2.8 eV之间,利用它催化可见光降解有机污染物具有较高的活性,从而引起了越来越多的关注。尽管近年来已经开发了几种制备Bi2O3基半导体材料的方法,但是仍然难以用简单的方法大规模地制备高活性的Bi2O3催化剂。因此,开发简单可行的大规模制备Bi2O3纳米晶体的方法对于工业废水处理的潜在应用具有重要意义。在这项工作中,我们通过蚀刻商用BiSn粉末,然后进行热处理,成功地大规模制备了多孔Bi2O3。获得的多孔Bi2O3在亚甲基蓝(MB)的光催化降解中表现出优异的活性和稳定性。对该机理的进一步研究表明,多孔Bi2O3合适的能带结构允许生成活性氧物种,例如O2-?和?OH,可有效降解MB。
关键词:  Bi2O3光催化剂  光催化降解  大规模  可见光  光催化
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