二氨基马来腈共聚合改性氮化碳光催化剂
利用二氨基马来腈(DMNA)与二聚氰胺(DCDA)的高温共聚合反应,制备了石墨相氮化碳(g-C3N4),并通过X射线衍射(XRD)、傅里叶变换红外(FTIR)光谱、透射电镜(TEM)、氮气吸脱附实验(N2-sorption)、电子顺磁共振(EPR)、紫外-可见漫反射光谱(UV-VisDRS)和荧光(PL)光谱等表征手段,系统考察了共聚合改性对g-C3N4晶体结构、化学结构、能带结构、织构、光吸收性能和光催化性能等的影响.研究结果表明:共聚合改性后氮化碳材料仍保持石墨相晶体结构,但其π电子的离域性增强,并在催化剂表面产生异质结构,进而提高了氮化碳在可见光区域的光吸收性能,并促进了光生载流子的有效...
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Published in | 物理化学学报 Vol. 28; no. 10; pp. 2336 - 2342 |
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Main Author | |
Format | Journal Article |
Language | Chinese |
Published |
福州大学光催化研究所,国家重点实验室培育基地,福州350002
2012
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Subjects | |
Online Access | Get full text |
ISSN | 1000-6818 |
DOI | 10.3866/PKU.WHXB201209104 |
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Summary: | 利用二氨基马来腈(DMNA)与二聚氰胺(DCDA)的高温共聚合反应,制备了石墨相氮化碳(g-C3N4),并通过X射线衍射(XRD)、傅里叶变换红外(FTIR)光谱、透射电镜(TEM)、氮气吸脱附实验(N2-sorption)、电子顺磁共振(EPR)、紫外-可见漫反射光谱(UV-VisDRS)和荧光(PL)光谱等表征手段,系统考察了共聚合改性对g-C3N4晶体结构、化学结构、能带结构、织构、光吸收性能和光催化性能等的影响.研究结果表明:共聚合改性后氮化碳材料仍保持石墨相晶体结构,但其π电子的离域性增强,并在催化剂表面产生异质结构,进而提高了氮化碳在可见光区域的光吸收性能,并促进了光生载流子的有效分离.性能评价结果显示,DMNA改性的氮化碳在可见光下光催化产氢活性明显高于未改性的样品,当DMNA用量为0.01g时,催化剂的产氢速率最高,达到45.0μmol·h-1,为纯氮化碳样品的4.5倍. |
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Bibliography: | 11-1892/06 g-C3N4 photocatalysts 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 (XRD) patterns,Fourier transformed infrared (FTIR),transmission electron microscopy (TEM),nitrogen-sorption (N2-sorption),electron paramagnetic resonance (EPR),ultraviolet-visble 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 delocalization of π-electrons and induce the formation of surface junctions,greatly enhancing the light-harvesting ability of g-C3N4 in visible light region and promoting the separation of photogenerated charg |
ISSN: | 1000-6818 |
DOI: | 10.3866/PKU.WHXB201209104 |