Effect of hydrothermal pH value on composition and morphology of bismuth oxybromide and their photocatalytic performance
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摘要: 通过调节pH值一步水热法制备溴氧化铋光催化剂，并利用X射线衍射（XRD）、扫描电镜（SEM）、紫外-可见漫反射光谱（UV-vis DRS）和固体荧光光谱（PL）等方法对其进行表征。在可见光（γ>420 nm）照射下，通过对水溶液中罗丹明B，甲基橙和苯酚的降解效果来评价溴氧化铋的光催化活性。结果表明，由于B9提高了对可见光的吸收以及电子-空穴对的分离效率，B9具有最好的光催化活性，同时探索水热pH值对制备溴氧化铋的形貌和组成的影响，并说明了不同水热pH值下溴氧化铋的合成过程。Abstract: A series of bismuth oxybromide photocatalysts were fabricated via a one-step hydrothermal method through pH value adjustment. The as-prepared photocatalysts were characterized by X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), scanning electron microscopy (SEM), UV-vis diffuse reflectance spectroscopy (UV-vis DRS) and photoluminescence spectroscopy (PL). The photocatalytic activities of the as-prepared samples were examined by degradation of Rhodamine B (RhB), methyl orange (MO) and phenol. The results indicate that the B9 displayed the highest photocatalytic activities. The enhanced photocatalytic activity can be attribute to enhanced absorption in the visible region and the decreased recombination efficiency of photogenerated charge carriers. The effect of hydrothermal pH value on the composition and morphology was explored and a synthesis process of bismuth oxybromide was proposed.
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Figure 3 Survey XPS spectrum (a), high-resolution XPS spectra of Bi 4f (b), Br 3d (c) and O 1s (d) for samples
Figure 5 UV-vis diffuse reflectance spectra (a) and plot of (αhv)1/2 versus photon energy (hv) curves of synthesized samples (b)
Figure 8 Photocatalytic property of synthesized samples in degradation of RhB(a); photodegradation of MO and phenol over B9 (b)
Figure 10 Photocatalytic degradation of RhB over B9 in the presence of different radicals scavengers
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