Wei Zhidong, Li Ruishuo, Wang Rui
School of Environmental Science and Engineering, Shandong University No. 27 Shanda South Road Jinan 250199 P. R. China
RSC Adv. 2018 Feb 19;8(15):7956-7962. doi: 10.1039/c7ra13779f.
In this study, hierarchical BiOBr microspheres were synthesized a one-pot solvothermal method in the presence of imidazole ionic liquids. The resultant samples were characterized by XRD, SEM, HRTEM, PL, EPR, EIS and UV-vis absorption spectroscopy. The photoactivity of BiOBr was evaluated by the photocatalytic degradation of methyl orange (MO) and tetracycline hydrochloride. Oxygen vacancies were detected in the system and proven to be correlated with the activity of the catalyst. It was also revealed that BiOBr microspheres prepared by 1-butyl-3-methylimidazolium bromide at 433 K for 8 hours displayed a superior performance compared to the other samples in the degradation of model organic contaminants. After 4.5 hours of reaction, the highest degradation efficiency of 94.0% was achieved by BiOBr-C-Br. Stronger photoluminescence spectral intensities could be obtained as the cationic chain lengths of the ionic liquids reduced gradually. According to our experiments, the better performance of BiOBr-C-Br in the degradation of model pollutants can be attributed to the effect of oxygen vacancies. The findings of our work may have important implications for the design of BiOBr.
在本研究中，采用一锅法溶剂热法在咪唑离子液体存在下合成了分级结构的BiOBr微球。通过XRD、SEM、HRTEM、PL、EPR、EIS和紫外可见吸收光谱对所得样品进行了表征。通过光催化降解甲基橙（MO）和盐酸四环素评估了BiOBr的光活性。在体系中检测到氧空位，并证明其与催化剂活性相关。还发现，由1-丁基-3-甲基咪唑溴化物在433 K下制备8小时的BiOBr微球在降解模型有机污染物方面比其他样品表现出更优异的性能。反应4.5小时后，BiOBr-C-Br实现了94.0%的最高降解效率。随着离子液体阳离子链长度逐渐减小，可以获得更强的光致发光光谱强度。根据我们的实验，BiOBr-C-Br在降解模型污染物方面表现更优可归因于氧空位的作用。我们工作的研究结果可能对BiOBr的设计具有重要意义。
