Affordable Access

Access to the full text

Nitrogen-doped Carbon Nanospheres-Modified Graphitic Carbon Nitride with Outstanding Photocatalytic Activity

Authors
  • Liu, Qiaoran1
  • Tian, Hao2
  • Dai, Zhenghua3
  • Sun, Hongqi4
  • Liu, Jian2
  • Ao, Zhimin3
  • Wang, Shaobin5
  • Han, Chen1
  • Liu, Shaomin1
  • 1 Curtin University, Perth, WA, 6845, Australia , Perth (Australia)
  • 2 Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian, 116023, People’s Republic of China , Dalian (China)
  • 3 Guangdong University of Technology, Guangzhou, 510006, People’s Republic of China , Guangzhou (China)
  • 4 Edith Cowan University, Joondalup, WA, 6027, Australia , Joondalup (Australia)
  • 5 The University of Adelaide, Adelaide, SA, 5005, Australia , Adelaide (Australia)
Type
Published Article
Journal
Nano-Micro Letters
Publisher
Springer Singapore
Publication Date
Jan 17, 2020
Volume
12
Issue
1
Identifiers
DOI: 10.1007/s40820-019-0358-x
Source
Springer Nature
Keywords
License
Green

Abstract

Metals and metal oxides are widely used as photo/electro-catalysts for environmental remediation. However, there are many issues related to these metal-based catalysts for practical applications, such as high cost and detrimental environmental impact due to metal leaching. Carbon-based catalysts have the potential to overcome these limitations. In this study, monodisperse nitrogen-doped carbon nanospheres (NCs) were synthesized and loaded onto graphitic carbon nitride (g-C3N4, GCN) via a facile hydrothermal method for photocatalytic removal of sulfachloropyridazine (SCP). The prepared metal-free GCN-NC exhibited remarkably enhanced efficiency in SCP degradation. The nitrogen content in NC critically influences the physicochemical properties and performances of the resultant hybrids. The optimum nitrogen doping concentration was identified at 6.0 wt%. The SCP removal rates can be improved by a factor of 4.7 and 3.2, under UV and visible lights, by the GCN-NC composite due to the enhanced charge mobility and visible light harvesting. The mechanism of the improved photocatalytic performance and band structure alternation were further investigated by density functional theory (DFT) calculations. The DFT results confirm the high capability of the GCN-NC hybrids to activate the electron–hole pairs by reducing the band gap energy and efficiently separating electron/hole pairs. Superoxide and hydroxyl radicals are subsequently produced, leading to the efficient SCP removal.

Report this publication

Statistics

Seen <100 times