Mesoporous TiO2/g-C3N4 composites with O-Ti-N bridge for improved visible-light photodegradation of enrofloxacin.,Science of the Total Environment

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Mesoporous TiO2/g-C3N4 composites with O-Ti-N bridge for improved visible-light photodegradation of enrofloxacin.
Science of the Total Environment ( IF 8.2 ) Pub Date : 2020-03-27 , DOI: 10.1016/j.scitotenv.2020.138280
Ru Zhang ₁ , Yaqin Yu ₂ , Hongbo Wang ₁ , Jingjing Du ₂

Affiliation

g-C3N4 makes good prospects in photocatalytic field due to its two-dimensional (2D) structure and visible-light activity. How to improve its photocatalytic activity by minimizing the unexpected recombination of photo-induced charge carries on g-C3N4 motivates our research. Herein, mesoporous TiO2/g-C3N4 composites are fabricated with 2D TiO2(B) nanosheets regulating thermal condensation process of g-C3N4 nanosheets. FT-IR and XPS results suggest that the formation of O-Ti-N chemical bond increases the percentage of N-(C)3 in the conjugated system, accelerating the transportation of photo-induced electrons. The optical property and PL results illustrate that the formed interface heterojunction with chemical bond facilitates the separation and transfer of photo-induced charge carriers. Hence, the removal constant of TiO2/g-C3N4 composites is 46.3 times higher than that of g-C3N4. This study opens up a new insight into the development of composite materials in the field of organic pollutant treatment.

中文翻译：

具有O-Ti-N桥的介孔TiO2 / g-C3N4复合材料，用于改善恩诺沙星的可见光光降解。

g-C3N4由于具有二维（2D）结构和可见光活性，因此在光催化领域具有良好的前景。如何通过使光诱导电荷的意外重组最小化来提高其光催化活性对g-C3N4进行了研究。在这里，介孔的TiO2 / g-C3N4复合材料是用2d TiO2（B）纳米片调节g-C3N4纳米片的热缩合过程制成的。FT-IR和XPS结果表明，O-Ti-N化学键的形成增加了共轭体系中N-（C）3的百分比，从而加速了光诱导电子的传输。光学性质和PL结果表明形成的具有化学键的界面异质结促进了光诱导的电荷载流子的分离和转移。因此，TiO2 / g-C3N4复合材料的去除常数为46。比g-C3N4高3倍。这项研究为有机污染物处理领域中复合材料的发展开辟了新的思路。

更新日期：2020-03-27

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