Lee Seungwon, Cho Insu, Sohn Youngku
J Nanosci Nanotechnol. 2015 Nov;15(11):8362-9. doi: 10.1166/jnn.2015.11466.
We prepared hierarchical BiOBr, AgBr/BiOBr and BiOBr(x)I(1-x) (x = 0.3, 0.5 and 0.7) microspheres in ethylene glycol by a solvothermal method, then analyzed them by scanning electron microscopy, X-ray diffraction crystallography, Raman, UV-Visible absorption, BET surface area measurement and photoluminescence spectroscopy. In addition, their photocatalytic activities for methyl orange were tested under irradiation by visible light. The BET surface area, adsorption and photocatalytic activity occurred in the order AgBr/BiOBr < BiOBr << BiOBr(x)I(1-x) (x = 0.3, 0.5 and 0.7). The flower-like BiOBr microspheres exhibited a band gap of 2.76 eV, which decreased with increasing I/Br ratio. The *O2- and h+ were found to be major active species for MO degradation. For BiOBr and AgBr/BiOBr microspheres, *OH radical formation was clearly observed, while the role of *OH radical was found to be negligible for BiOBr(x)I(1-x) (x = 0.3, 0.5 and 0.7) microspheres.
我们通过溶剂热法在乙二醇中制备了分级结构的溴氧化铋、溴化银/溴氧化铋和溴氧化铋碘化物（x = 0.3、0.5和0.7）微球，然后通过扫描电子显微镜、X射线衍射晶体学、拉曼光谱、紫外可见吸收光谱、比表面积测量和光致发光光谱对其进行分析。此外，还测试了它们在可见光照射下对甲基橙的光催化活性。比表面积、吸附和光催化活性的顺序为溴化银/溴氧化铋 < 溴氧化铋 << 溴氧化铋碘化物（x = 0.3、0.5和0.7）。花状溴氧化铋微球的带隙为2.76 eV，随着I/Br比的增加而减小。发现超氧阴离子和空穴是甲基橙降解的主要活性物种。对于溴氧化铋和溴化银/溴氧化铋微球，清楚地观察到羟基自由基的形成，而对于溴氧化铋碘化物（x = 0.3、0.5和0.7）微球，羟基自由基的作用可忽略不计。
