当前位置: X-MOL 学术Mater. Chem. Front. › 论文详情
Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)
Phase-controlled synthesis of bismuth oxide polymorphs for photocatalytic applications†
Materials Chemistry Frontiers ( IF 7 ) Pub Date : 2018-07-09 00:00:00 , DOI: 10.1039/c8qm00221e
Thangavel Selvamani 1, 2, 3, 4, 5 , Sambandam Anandan 1, 2, 3, 4, 5 , Luis Granone 6, 7, 8, 9 , Detlef W. Bahnemann 6, 7, 8, 9 , Muthupandian Ashokkumar 10, 11, 12
Affiliation  

In this study, bismuth oxide polymorphs (α and β phases) were synthesized using a post-calcination method using Bi2O2CO3 nanoflakes as an intermediate. These samples were characterized by various spectroscopic techniques such as powder X-ray diffraction, Fourier transform infrared spectroscopy, Raman spectroscopy, UV-visible absorption, photoluminescence studies and microscopic analysis (scanning and transmission electron microscopy). The mechanism of the formation of β-Bi2O3 nanoparticles and the α-Bi2O3 coral-like morphology has been proposed. Furthermore, the photocatalytic performance of the bismuth oxide polymorphs was investigated via the degradation of organic dyes (rhodamine B, methylene blue, acid orange 7 and methyl orange) under simulated solar illumination. The results show that the β-Bi2O3 nanoparticles possess superior photocatalytic activity compared to the α-Bi2O3 coral-like morphology for the degradation of these dyes due to a higher photon adsorption (band gap of 2.2 eV for β-Bi2O3 and 2.56 eV for α-Bi2O3). However, the photocatalytic activity of these bismuth oxide polymorphs for the degradation of organic dyes followed the order of Rh B > AO 7 > MB > MO under identical experimental conditions. A plausible mechanism has been proposed for the photocatalytic activity.

中文翻译:

用于光催化应用的氧化铋多晶型物的相控合成

在这项研究中,使用Bi 2 O 2 CO 3纳米薄片作为中间体,采用后煅烧方法合成了氧化铋多晶型物(α和β相)。这些样品通过各种光谱技术进行了表征,例如粉末X射线衍射,傅里叶变换红外光谱,拉曼光谱,紫外可见吸收,光致发光研究和显微镜分析(扫描和透射电子显微镜)。β-Bi的形成的机理2 ö 3个纳米颗粒和α-Bi系2 ö 3珊瑚状形态已提议。此外,还通过以下方法研究了氧化铋多晶型物的光催化性能。模拟日光照射下有机染料(若丹明B,亚甲基蓝,酸性橙7和甲基橙)的降解。结果表明,β型的Bi 2个ö 3纳米颗粒相比,具有优异的光催化活性α-Bi系2 ö 3珊瑚状形态为这些染料的降解因为2.2eV的高的光子吸附(带隙为β-的Bi 2 ö 3和2.56电子伏特为α-Bi系2 ö 3)。然而,在相同的实验条件下,这些氧化铋多晶型物对有机染料降解的光催化活性遵循Rh B> AO 7> MB> MO的顺序。已经提出了对于光催化活性的合理机制。
更新日期:2018-07-09
down
wechat
bug