INFLUENCE OF AIR AND NITROGEN ATMOSPHERE ON g-C3N4 SYNTHESIZED FROM UREA

Authors

  • Atita Tapo Chulalongkorn university
  • Chumphol Busabok Expert Centre of Innovative Materials, Thailand Institute of Scientific and Technological Research
  • Pornapa Sujaridworakun Chulalongkorn University
  • Piyalak Ngernchuklin Expert Centre of Innovative Materials, Thailand Institute of Scientific and Technological Research
  • Wasana Khongwong Expert Centre of Innovative Materials, Thailand Institute of Scientific and Technological Research

Keywords:

Visible light, Photocatalysis, g-C3N4, Air and Nitrogen atmosphere

Abstract

This work was attempted to develop g-C3N4 synthesized from urea using for photocatalysis application under visible light. The effects of the heat treatment parameters such as reaction temperatures (450, 500, 550 and 600 oC) and controlled atmospherics during synthesis (air and nitrogen) were studied. Urea powders were placed in an alumina boat crucible and put in a tube furnace and then heated up from ambient temperature to 250 oC with a heating rate 10 oC/min for 10 min soaking. After that, the temperature was decreased to 220 oC and soaked for 10 min followed by increasing the temperature to 450 oC – 600 oC with 2 oC/min and soaked for 30 min in air or nitrogen atmosphere. The synthesized powders were characterized for morphology by SEM, phase analysis by XRD and light absorption by UV-VIS-NIR spectrometer. The photocatalytic properties of synthesized g-C3N4 in air or nitrogen atmosphere were investigated via the degradation of methylene blue under visible light irradiation (more than 450 nm wavelength generated from 50W LED lamp). The yield of products synthesized in N2 atmosphere was higher than in air due to less decomposition of urea compared with in air. The band gap energy of g-C3N4 synthesized in N2 was narrower than that synthesized in air resulting in wider wavelength absorbed. Moreover, the increasing temperatures lead to reducing of bandgap energy of g-C3N4 in N2 atmosphere

 

Author Biography

Pornapa Sujaridworakun, Chulalongkorn University

Department of Materials science, Faculty of Science

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Published

2022-06-30

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Articles