Citation: ZHENG Hua-Rong, ZHANG Jin-Shui, WANG Xin-Chen, FU Xian-Zhi. Modification of Carbon Nitride Photocatalysts by Copolymerization with Diaminomaleonitrile[J]. Acta Physico-Chimica Sinica, ;2012, 28(10): 2336-2342. doi: 10.3866/PKU.WHXB201209104 shu

Modification of Carbon Nitride Photocatalysts by Copolymerization with Diaminomaleonitrile

1.
Research Institute of Photocatalysis, State Key Laboratory Breeding Base of Photocatalysis, Fuzhou University, Fuzhou 350002, P. R. China

Received Date: 9 August 2012
Available Online: 10 September 2012
Fund Project: 国家重点基础研究发展计划(2013CB632405) (2013CB632405)国家自然科学基金(21033003,21173043)资助项目 (21033003,21173043)

g-C₃N₄photocatalysts were synthesized by copolymerization of diaminomaleonitrile (DMNA) with dicyanodiamide (DCDA) at high temperatures. The effect of copolymerization on the crystal structure, chemical structure, band structure, texture, optical property and photocatalytic performance of g-C₃N₄ was studied by such characterization techniques as X-ray diffraction patterns (XRD), Fourier transformed infrared (FT-IR), transmission electron microscopy (TEM), nitrogen-sorption (N₂-sorption),electron paramagnetic resonance (EPR), UV-Vis diffuse reflectance spectra (UV-Vis DSR) and photoluminescence (PL) analyses. Results demonstrated that the graphitic-like layer packing structure of g-C₃N₄ remained unchanged after the modification; however the copolymerization with DMNA can efficiently extend the delocalizationof π-electrons and induce the formation of surface junctions, greatly enhancing the light-harvesting abilityof g-C₃N₄ in visible light region and promoting the separation of photogenerated charge carriers, respectively. Photocatalytic performance showed that all DMNA-modified samples presented an enhanced H₂ evolution activity under visible light irradiation. The optimized weight-in amount of DMNA is found to be 0.01g, by which the modified sample shows the highest hydrogen evolution rate of 45.0 μmol·h^-1. This value is 4.5 times as high as that of the unmodified carbon nitride sample.
- Photocatalyst,
- Solar energy utilization,
- Hydrogen fuel,
- Copolymerization,
- Carbon nitride
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