Journal
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
Volume 26, Issue 15, Pages 15710-15723Publisher
SPRINGER HEIDELBERG
DOI: 10.1007/s11356-019-04800-3
Keywords
Carbon nitride; Weak light; Porous; Oxygen doped; Photocatalysis; Supramolecular preassembly
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Funding
- National Science Funds for Creative Research Groups of China [51421006]
- National Natural Science Foundation of China [51775167]
- National Major Projects of Water Pollution Control and Management Technology [2017ZX07204003]
- Qing Lan Project of Jiangsu province
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In order to overcome photocatalytic technology application limitations in water due to weak light intensity, it is crucial to synthesize photocatalysts that respond to weak light. In this study, porous and oxygen-doped carbon nitride (CN-MC) was synthesized via supramolecular preassembly technology using melamine and cyanuric chloride. The carbon nitride catalyst produced via this technology has a relatively high surface area (63.2m(2)g(-1)), irregular pores, and oxygen doping characteristics, which enhance the light capture capacity, increase the number of reactive sites, and accelerate electron-hole separation efficiency. Thus, the CN-MC exhibited excellent photocatalytic activity during the degradation of organic pollutants Rhodamine B (RhB, 95% removal within 6h) and tetracycline hydrochloride (TC-HCl, 70% removal within 6h) under low-intensity light (the light intensity=0.8 similar to 1.8mWcm(-2) with a wavelength range of 300-700nm). Mechanistic analysis showed that O-2(-) and OH were the dominant active free radicals during RhB and TC-HCl photocatalytic degradation over CN-MC. The proposed synthesis strategy effectively improves the photocatalytic activity of graphite carbon nitride under weak light by producing a porous morphology and oxygen atom doping.
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