光催化
光降解
扫描电子显微镜
三元运算
化学
可见光谱
异质结
材料科学
复合材料
核化学
化学工程
催化作用
光电子学
有机化学
工程类
程序设计语言
计算机科学
作者
Min Zhu,Huimin Chen,Yu Dai,Xuanyu Wu,Zhiguo Han,Yu Zhu
摘要
Antibiotics, considered as persistent organic pollutants, have harmful effect on the environment and human health. We aimed at designing and fabricating ternary AgI/BiOI/UiO‐66 composites and evaluate the photocatalytic activities of tetracycline (TC) in water environment under visible light irradiation. X‐ray diffractometer (ХRD), scanning electron microscopy–energy dispersive X‐ray spectroscopy (SEM‐EDS), transmission electron microscopy (TEM), Brunauer–Emmett–Teller (BET), and ultraviolet–visible (UV‐vis) diffuse reflectance spectra (DRS) analyses were carried out to characterize the ternary AgI/BiOI/UiO‐66 composites. The effects of pristine BiOI, UiO‐66, and AgI loading ratios on the AgI/BiOI/UiO‐66 composites for TC photodegradation were evaluated to obtain the optimal one ( 1‐ABU ), which can remove 90.1% TC with visible light irradiation. In the batch experiment, the influences of pH, ion strength, TC concentration, and dosage of photocatalyst were investigated. 1‐ABU exhibited excellent photocatalytic activities and stability including pH and ion strength resistance in certain degree. After recycled five times, 1‐ABU still showed good degradation efficiency, indicating the advanced stability of the ternary composites. ·OH and h + active species are the prime, whereas ·O 2 − act as secondary during the TC degradation process. 1‐ABU exhibits an n‐p‐n heterojunction, which can inhibit the recombination of photogenerated electron–hole pairs and generate more active ·OH species. This work highlights a reference for the design and synthesis of heterojunction for excellent photocatalytic performance.
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