Departments of Physics and Nanotechnology, SRM Research Institute, SRM Institute of Science and Technology, Kattankulathur, Chennai, 603203, India.
Departments of Physics and Nanotechnology, SRM Research Institute, SRM Institute of Science and Technology, Kattankulathur, Chennai, 603203, India.
Chemosphere. 2022 Jan;287(Pt 4):132379. doi: 10.1016/j.chemosphere.2021.132379. Epub 2021 Sep 28.
Tuning a graphitic carbon nitride (CN) structure is an effective strategy to advance its physicochemical and electronic properties. Herein, hierarchical CN nanorods with carbon vacancy were synthesized via ultrasound-assisted thermal polycondensation method wherein melamine-HONH·HCl complex acts as a template. The hierarchical CN nanorods can facilitate multiple light scattering, provide large specific surface area with extensive reactive sites and endow abundant mass-transport channels for charge migration. The existence of carbon vacancies can serve as shallow charge trapping sites and prompt charge separation. Consequently, hierarchical CN nanorod possessed excellent sonophotodegradation efficiency of ∼100% towards Tetracycline (TC) antibiotic within 60 min under ultrasonic irradiation and visible light illumination. Moreover, the sonophotocatalytic degradation was higher than the sum of sonocatalytic and photocatalytic TC degradation using hierarchical CN nanorods due to its synergistic performance. A plausible sonophotocatalytic mechanism and TC degradation pathway using hierarchical CN nanorod were proposed. Lastly, hierarchical CN nanorod is durable and stable which can withstand the sonophotocatalytic condition even after the fifth run. This work offers an insight into hierarchical CN nanorod to advance sonophotocatalytic degradation performance for highly efficient removal of various recalcitrant pollutants.
调谐石墨相氮化碳（CN）的结构是提高其物理化学和电子特性的有效策略。本文通过超声辅助热缩聚方法合成了具有碳空位的分级 CN 纳米棒，其中三聚氰胺-HONH·HCl 配合物作为模板。分级 CN 纳米棒可以促进多次光散射，提供具有广泛反应位点的大比表面积，并赋予丰富的传质通道以促进电荷迁移。碳空位的存在可以作为浅电荷捕获位点，促进电荷分离。因此，在超声辐射和可见光照射下，分级 CN 纳米棒在 60 分钟内对四环素（TC）抗生素具有约 100%的优异声光电降解效率。此外，由于协同作用，使用分级 CN 纳米棒进行的声光电催化降解高于单独使用声催化和光催化 TC 降解的总和。提出了一种合理的声光电催化机制和使用分级 CN 纳米棒的 TC 降解途径。最后，分级 CN 纳米棒是耐用且稳定的，即使在第五次运行后，也能承受声光电催化条件。这项工作深入了解了分级 CN 纳米棒，以提高声光电催化降解性能，从而高效去除各种难降解污染物。
