Preparation of g-C3N4 with High Specific Surface Area and Photocatalytic Stability

Abstract

g-C 3 N 4 with porous structure has been synthesized by a thermal polymerization method and its specific surface area regulated by changing the calcination temperature. The as-prepared g-C 3 N 4 was characterized by x-ray diffraction (XRD) analysis, Fourier-transform infrared (FT-IR) spectroscopy, scanning electron microscopy (SEM), transmission electron microscopy (TEM), x-ray photoelectron spectroscopy (XPS), and ultraviolet-visible (UV-Vis) spectrophotometer. The photocatalytic activity of g-C 3 N 4 was investigated using Methyl Orange (MO) as target pollutant. The results show that the g-C 3 N 4 exhibited a unique porous structure with a specific surface area reaching 142.1 m 2 /g at 610°C. When the calcination temperature was 570°C, the specific surface area of g-C 3 N 4 was 116.3 m 2 /g and the photodegradation rate of MO was 65%. Moreover, g-C 3 N 4 retained good photocatalytic stability after being used for five times. The photocatalytic mechanism was also explored by free-radical scavenging experiments.

In situ synthesis of g-C3N4/Ti3C2Tx nano-heterostructures for enhanced photocatalytic H2 generation via water splitting

“…The measured specic surface areas of the synthesised nano-heterostructures gCT-1, gCT-0.75, gCT-0.50, gCT-0.25, and gCT-0.05 were 10.4, 16.7, 8.8, 5.7 and 3.8 m 2 g −1 , respectively. 75 The specic surface area (SSA) was estimated using BET equation for the gCT-0.75 composite and found to be 16.7 m 2 g −1 , which is a factor of 1.84-greater than that of the assynthesized Ti 3 C 2 T x (9.1 m 2 g −1 ). The increase in specic surface area (SSA) can be explained by the formation of a nanoheterostructure between Ti 3 C 2 T x and g-C 3 N 4 nanosheets, enlarging the interlayer spacing between the MXene multilayers aer increasing the content of g-C 3 N 4 in the composite.…”

Graphitic Carbon Nitride/Zinc Oxide-Based Z-Scheme and S-Scheme Heterojunction Photocatalysts for the Photodegradation of Organic Pollutants

“…On that note, Jun and Shalom adopted a new method to synthesize bulk g-C 3 N 4 with a relatively high surface area (60-80 m 2 g −1 ) by utilizing the pre-organized supramolecular complex of melamine and cyanuric acid via topotactic transformation [64,65]. It is also reported that an increase in calcination temperature with a slower heating rate can marginally improve the surface area and crystallinity of g-C 3 N 4 [66].…”

Metal nitrides as efficient electrode material for supercapacitors: A review

“…High content of nitrogen in g-C3N4 offer plentiful of active-sites for redox reactions. Furthermore, g-C3N4 has a large theoretical surface area, stable structure, and composition similar to that of graphene [173,174]. However, due to serious stacking of g-C3N4 sheets, research is mainly focused on its composites with other capacitive materials [175].…”