Tetracycline Removal Under Solar Illumination Over Ag3VO4/mpg-C3N4 Heterojunction Photocatalysts
Tetracycline Removal Under Solar Illumination Over Ag3VO4/mpg-C3N4 Heterojunction Photocatalysts
复制标题
Ag3VO4/mpg-C3N4 异质结光催化剂在太阳光照射下去除四环素
DOI：
10.1111/php.12992
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发表时间：
2019
影响因子：
3.3
通讯作者：
Wang Xiaojing
中科院分区：
文献类型：
--
作者：
Le Shukun;Li Wenjing;Li Yue;Borjigin Burenbayaer;Li Guangshe;Wang Xiaojing
通过将Ag 3VO 4颗粒固定在mpg-C3 N4纳米片上，制备了Ag 3VO 4/mpg-C3 N4（介孔石墨氮化碳）异质结光催化剂。制备的Ag 3VO 4/mpg‐ C3 N4异质结用于去除四环素（TC），四环素是一种在太阳光照射下广泛释放到水环境中的抗生素。与纯的mpg-C3 N4和Ag 3VO 4相比，Ag 3VO 4/mpg-C3 N4显示出更高的光催化活性（在可见光照射下90 min内去除率为83.2%）。重要的是，在五次循环后，没有观察到Ag 3VO 4/mpg-C3 N4 - 40的明显失活，推断出良好的可重复使用性。光电流测量和光致发光光谱证实，Ag 3VO 4/mpg-C3 N4优异的光催化性能归功于两个半导体形成的异质结处电子-空穴分离的增强。此外，基于清除剂捕集实验、ESR谱和高效液相色谱-质谱联用分析，提出了Ag 3VO 4/mpg-C3 N4光催化剂在人工日光照射下降解水溶液中TC的可能机理和中间产物.本研究为去除水环境中的抗生素提供了一种低成本、绿色、易操作的方法。
Ag3VO4/mpg‐C3N4(mesoporous graphitic carbon nitride) heterojunction photocatalysts were prepared by anchoring tiny Ag3VO4particles on the nanosheet of mpg‐C3N4. The prepared Ag3VO4/mpg‐C3N4heterojunctions were used to remove tetracycline (TC), a kind of antibiotics widely released into the aquatic environment under solar irradiation. Compared with pure mpg‐C3N4and Ag3VO4, Ag3VO4/mpg‐C3N4displayed much higher photocatalytic activity (83.2% removal rate within 90 min under visible‐light irradiation). Importantly, no apparent deactivation was observed for Ag3VO4/mpg‐C3N4‐40 after five cycles, inferring a good reusability. As confirmed by photocurrent measurement and photoluminescence spectra, the excellent photocatalytic property of Ag3VO4/mpg‐C3N4was credit to the electron–hole separation enhancement at the formed heterojunction of two semiconductors. In addition, a possible mechanism and intermediate products for the Ag3VO4/mpg‐C3N4photocatalysts toward the photodegradation of TC in aqueous solution under artificial sunlight radiation were proposed based on the scavengers trapping test, ESR spectra and a high‐performance liquid chromatography (HPLC) coupled with mass spectrometer (MS) analysis. This investigation provides a low cost, green and easily practical approach to remove the antibiotics in the aquatic environment.