二氨基马来腈共聚合改性氮化碳光催化剂

doi:10.3866/PKU.WHXB201209104

Abstract

Abstract:

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.

Key words: Photocatalyst, Solar energy utilization, Hydrogen fuel, Copolymerization, Carbon nitride

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

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Modification of Carbon Nitride Photocatalysts by Copolymerization with Diaminomaleonitrile

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