期刊
MOLECULES
卷 27, 期 6, 页码 -出版社
MDPI
DOI: 10.3390/molecules27061754
关键词
porous g-C3N4; O doping; visible-light irradiation; photocatalysis
资金
- National Key Research and Development Plan [2018YFC1800902]
- China Scholarship Council (CSC)
The porous graphitic carbon nitride prepared via pyrolysis method exhibited enhanced visible-light-driven photocatalytic performance compared to homogeneous g-C3N4. This improvement was attributed to the porous structure enhancing light capture and mass transfer ability.
Porous graphitic carbon nitride (g-C3N4) was prepared by dicyandiamide and urea via the pyrolysis method, which possessed enhanced visible-light-driven photocatalytic performance. Its surface area was increased from 17.12 to 48.00 m(2)/g. The porous structure not only enhanced the light capture capacity, but also accelerated the mass transfer ability. The Di (Dicyandiamide)/Ur (Urea) composite possessed better photocatalytic activity for Rhodamine B in visible light than that of g-C3N4. Moreover, the Di/Ur-4:5 composite showed the best photoactivity, which was almost 5.8 times that of g-C3N4. The enhanced photocatalytic activity showed that holes and superoxide radical played a key role in the process of photodegradation, which was ascribed to the enhanced separation of photogenerated carriers. The efficient separation of photogenerated electron-hole pairs may be owing to the higher surface area, O dopant, and pore volumes, which can not only improve the trapping opportunities of charge carriers but also the retarded charge carrier recombination. Therefore, it is expected that the composite would be a promising candidate material for organic pollutant degradation.
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