α-Bi2O3纳米棒：合成、表征和紫外光催化活性,Materials Research Express

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α-Bi2O3纳米棒：合成、表征和紫外光催化活性
Materials Research Express ( IF 1.8 ) Pub Date : 2017-03-29 , DOI: 10.1088/2053-1591/aa6712
Ahmed M Abu-Dief ₁ , W S Mohamed ₂

Affiliation

在本研究中，以（水：乙醇）（1：1）为混合溶剂，在最佳条件下通过简单的一步水热路线成功合成了单斜晶系氧化铋纳米棒（α-Bi2O3 NRs）。Bi2O3 纳米粉末通过不同的技术在结构、形态、组成、光学和光催化性能方面进行了详细表征。X射线衍射（XRD）分析表明，合成的Bi2O3 NRs纯度高，具有单斜结构（α-Bi2O3）和良好的结晶度。透射电子显微镜 (TEM)、能量色散 X 射线光谱 (EDXS) 和场发射扫描电子显微镜 (FE-SEM) 分析清楚地证实了合成后的 Bi2O3 样品的高纯度和纳米棒形貌。根据 Kubelka-Munk 理论，使用 UV-Vis 漫反射光谱 (UV-Vis DRS) 分析估计 α-Bi2O3 NR 的光学带隙。发现 α-Bi2O3 NR 的光学带隙对于间接允许跃迁为 3.55 eV，对于直接允许跃迁为 3.63 eV。傅里叶转移红外光谱 (FTIR) 用于检查结构以及评估对应于 Bi2O3 的声子振动模式。使用紫外光源灯研究了 α-Bi2O3 NRs 的光催化活性。合成的α-Bi2O3 NRs光催化剂在紫外（UV）照射下表现出更好的亚甲蓝（MB）降解和脱色性能。使用 α-Bi2O3 NRs 作为光催化剂，MB 在紫外线照射下 210 分钟后完全光降解。

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α-Bi2O3nanorods: synthesis, characterization and UV-photocatalytic activity

In this study, Monoclinic bismuth oxide nanorods (α-Bi2O3 NRs) were successfully synthesized by a simple one-step hydrothermal route using (water: ethanol) (1:1) as a mixed solvents at optimum conditions. The Bi2O3 nano-powder was characterized in detail by different techniques in terms of their structural, morphological, compositional, optical and photocatalytic properties. X-ray diffraction (XRD) analysis indicated that the as-synthesized Bi2O3 NRs exhibited high purity with monoclinic structure (α-Bi2O3) and good crystallinity. The Transmission electron microscope (TEM), Energy dispersive x-ray spectroscopy (EDXS) and Field Emission scanning electron microscope (FE-SEM) analysis clearly confirmed the high purity and the nanorod morphology of the as-synthesized Bi2O3 sample. The optical band gap of α-Bi2O3 NRs was estimated using the UV–Vis diffuse reflectance spectroscopy (UV–Vis DRS) analysis according to the Kubelka–Munk theory. The optical band gap of α-Bi2O3 NRs was found to be 3.55 eV for an indirect allowed transition and 3.63 eV for a direct allowed transition. The Fourier transfer infrared spectroscopy (FTIR) was employed to check the structure as well as to evaluate the phonon vibration modes corresponding to Bi2O3. Photocatalytic activity of α-Bi2O3 NRs was investigated using UV source lamp. The as-synthesized α-Bi2O3 NRs photocatalyst exhibited better performance for degradation and decolorization of Methylene blue (MB) under ultraviolet (UV) irradiation. MB was completely photodegraded after 210 min under UV irradiation using α-Bi2O3 NRs as photocatalyst.

更新日期：2017-03-29

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