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.

Three-dimensional hierarchically porous carbon (denoted as SA-900) with microporous, mesoporous and macroporous structure was facilely fabricated via direct carbonization of sodium alginate. SA-900 was fully characterized with N2 adsorption-desorption, scanning...

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