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Porous oxygen-doped carbon nitride: supramolecular preassembly technology and photocatalytic degradation of organic pollutants under low-intensity light irradiation

  • Yuxiong Wang
  • Lei RaoEmail author
  • Peifang WangEmail author
  • Yong Guo
  • Xiang Guo
  • Lixin Zhang
Research Article
  • 84 Downloads

Abstract

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 (63.2 m2 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 6 h) and tetracycline hydrochloride (TC-HCl, 70% removal within 6 h) under low-intensity light (the light intensity = 0.8~1.8 mW cm−2 with a wavelength range of 300–700 nm). Mechanistic analysis showed that ·O2 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.

Keywords

Carbon nitride Weak light Porous Oxygen doped Photocatalysis Supramolecular preassembly 

Notes

Funding information

This work received grants from the National Science Funds for Creative Research Groups of China (No. 51421006), the National Natural Science Foundation of China (No. 51775167), the National Major Projects of Water Pollution Control and Management Technology (No. 2017ZX07204003), and the Qing Lan Project of Jiangsu province.

Supplementary material

11356_2019_4800_MOESM1_ESM.doc (2.2 mb)
ESM 1 (DOC 2233 kb)

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Copyright information

© Springer-Verlag GmbH Germany, part of Springer Nature 2019

Authors and Affiliations

  1. 1.Key Laboratory of Integrated Regulation and Resource Development on Shallow Lakes, Ministry of Education, College of EnvironmentHohai UniversityNanjingChina
  2. 2.College of Mechanics and MaterialsHohai UniversityNanjingChina

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