论文部分内容阅读
以氰胺为前驱体,通过胶态纳米氧化硅小球模板法,制备了一系列介孔类石墨氮化碳材料(mpg-C3N4)。通过X射线衍射、N2吸附-脱附、透射电镜、红外光谱、元素分析等手段对mpg-C3N4的结构和形貌等理化性质进行了表征。结果发现,通过调控硬模板和前驱体的用量可以获得比表面(190～301m2/g)和孔体积(0.65～1.07cm3/g)可调的mpg-C3N4材料。以Knoevenagel缩合为探针反应研究了mpg-C3N4的催化性能,结果显示,在以苯甲醛和丙二腈为底物的缩合反应中,去质子化mpg-C3N4表现出良好的催化性能。经简单分离后催化剂可重复使用5次以上且活性基本保持不变。
A series of mesoporous graphitic carbonitride materials (mpg-C3N4) were prepared by the colloidal nano-silica spheres template method with cyanamide as precursor. The physical and chemical properties of mpg-C3N4 were characterized by X-ray diffraction, N2 adsorption-desorption, transmission electron microscopy, infrared spectroscopy and elemental analysis. The results showed that mpg-C3N4 material with specific surface area (190 ~ 301m2 / g) and pore volume (0.65 ~ 1.07cm3 / g) can be obtained by controlling the amount of hard template and precursor. The catalytic performance of mpg-C3N4 was investigated by Knoevenagel condensation reaction. The results showed that the deprotonated mpg-C3N4 showed good catalytic performance in the condensation of benzaldehyde with malononitrile. After simple separation, the catalyst can be reused more than 5 times and its activity remained basically unchanged.