Journal
JOURNAL OF HAZARDOUS MATERIALS
Volume 413, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.jhazmat.2021.125376
Keywords
Carbon nitride; Hierarchical microrod; Carbon vacancy; Photocatalysis; Tetracycline degradation
Categories
Funding
- National Natural Science Foundation of China [21576050, 51602052]
- Jiangsu Provincial Natural Science Foundation of China [BK20150604]
- Fundamental Research Funds for the Central Universities of China [3207045403, 3207045409, 3207046414]
- Foundation of Jiangsu Key Laboratory for Biomass Energy and Material [JSBEM201805]
- Priority Academic Program Development of Jiangsu Higher Education Institutions (PAPD)
- Zhongying Young Scholars of Southeast University
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A carbon vacancy modified hierarchical carbon nitride microrod has been prepared and shows excellent photocatalytic degradation performance. The microrod has high specific surface area and improved light utilization efficiency, enabling efficient degradation of tetracycline. The main mechanism of photodegradation is attributed to O-2(-), O-1(2), and H2O2 species.
Graphitic carbon nitride is considered as one of the promising photocatalysts for pollution elimination from wastewater. Manipulating the microstructure of carbon nitride remains a challengeable task, which is essential for improving light absorption, separating photogenerated carrier and creating reactive sites. Herein, a carbon vacancy modified hierarchical carbon nitride microrod (CN1.5) has been prepared templated from a melamine-NH2OH center dot HCl complex. The hierarchical microrods are demonstrated to be comprised of interconnected nanosheets with rich carbon vacancies, which endows it with high specific surface area, enhanced light utilization efficiency, available reactive sites, improved charge carrier separation and numerous mass-transport channels. The resultant photocatalyst CN1.5 exhibits an excellent photodegradation efficiency of 87.9% towards tetracycline under visible light irradiation. The remarkable apparent rate constant of 4.91 x 10(-2) min(-1) is 7.3 times higher than that of bulk CN. In addition, the degradation pathways are deduced base on the observation of degradation intermediates generating in the photocatalytic process. Mechanism investigation indicates that the major contribution for photodegradation is attributed to center dot O-2(-), O-1(2) and H2O2 species. This work provides new insights into advancing carbon nitride's microstructure to improve photocatalytic degradation performance for highly efficient antibiotic removal and environment remediation.
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