Binary-phase TiO2 modified Bi2MoO6 crystal for effective removal of antibiotics under visible light illumination
Binary-phase TiO2 modified Bi2MoO6 crystal for effective removal of antibiotics under visible light illumination
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二相 TiO2 改性 Bi2MoO6 晶体可在可见光照射下有效去除抗生素
DOI：
10.1016/j.materresbull.2019.01.002
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发表时间：
2019-04-01
影响因子：
5.4
通讯作者：
Liu, Hong
中科院分区：
文献类型：
--
作者：
Liu, Zhen;Tian, Jian;Liu, Hong
通过溶剂热煅烧工艺制备了一系列二元相 TiO2 改性 Bi2MoO6 纳米晶体。微量TiO2修饰可以有效增强Bi2MoO6的可见光催化活性，去除水溶液中的抗生素。通过 XRD、N-2 吸附、SEM、TEM、UV-vis DRS、Raman、XPS、PL 和光电化学测量等物理化学技术对所得 TiO2/Bi2MoO6 复合材料进行了研究。 TiO2纳米粒子（NPs）的存在影响了Bi2MoO6晶体的生长，减小了Bi2MoO6晶体的尺寸并有效提高了其比表面积。此外，TiO2的导带可以作为电子转移平台，极大地促进了TiO2/Bi2MoO6异质结界面光载流子的有效分离。凭借最佳的 TiO2 含量（0.41 wt%），TiO2/Bi2MoO6 对不同的抗生素降解表现出最佳的光催化性能，例如可见光照射下的环丙沙星、四环素和盐酸土霉素。此外，还阐明了增强环丙沙星降解光催化性能的机制。
A series of binary-phase TiO2 modified Bi2MoO6 nanocrystals have been prepared via a solvothermal-calcination process. Trace TiO2 modification can effectively enhance the visible light catalytic activity of Bi2MoO6 to remove the antibiotics in aqueous solution. The obtained TiO2/Bi2MoO6 composites were investigated by some physicochemical techniques like XRD, N-2 adsorption, SEM, TEM, UV-vis DRS, Raman, XPS, PL and Photo-electrochemical measurement. The presence of TiO2 nanoparticles (NPs) influenced the crystal growth of Bi2MoO6, decreasing the crystal size of Bi2MoO6 and effectively promoting its specific surface area. Moreover, the conduction band of TiO2 can serve as the electron transfer platform, which largely boosts the effective separation of photocarriers at TiO2/Bi2MoO6 heterojunction interface. With optimal TiO2 content (0.41 wt%), TiO2/Bi2MoO6 exhibited the best photocatalytic performance for different antibiotics degradation, e.g. ciprofloxacin, tetracycline and oxytetracyline hydrochloride under visible light irradiation. Moreover, the mechanism for enhanced photocatalytic performance in ciprofloxacin degradation was illuminated.