壳聚糖-F27软模板法制备孔结构可调的氮掺杂纳米介孔碳球

以壳聚糖为新的碳源和氮源的前驱体、三嵌段两亲共聚物(F127)为软模板,采用喷雾干燥和直接碳化技术成功制备了氮掺杂介孔碳纳米粒(NMCs)。系统研究了模板剂用量对氮掺杂介孔碳材料孔结构和氮元素含量的影响,采用X射线衍射仪(XRD)、热失重分析仪(TGA)、傅里叶变换红外光谱(FTIR)、透射电子显微镜(TEM)、比表面积和孔径分析仪(BET)、X射线光电子能谱(XPS)等技术对氮掺杂介孔碳纳米粒子的微观形貌和结构进行了表征。分析研究结果表明,氮掺杂介孔碳材料孔隙发达,纳米粒子具有球形形貌,平均直径约为300～400 nm,具有蠕虫状介孔结构,随着模板剂用量的增加,孔径在3. 05～6. 09 nm逐渐增大,氮元素含量逐渐从6. 324%减少为3. 020%,孔容和比表面积先增加后减少,碳源和模板剂质量比在6∶2时比表面积最大为868. 9 m^2/g,孔容为0. 963 cm^3/g。同时掺N后的介孔碳由于掺氮量不同,接触角随着氮含量的增加而减少。

Preparation of N-doped Nano Mesoporous Carbon Spheres with Adjustable Pore Structure Using Chitosan-F27 Soft Template Method

N-doped mesoporouscarbon spheres (NMCs) were successfully prepared by means of spray drying and direct carbonization and using chitosan as the precursor of new carbon and nitrogen sources and the triblockamphiphilic copolymer (F127) as the soft template. The influence of the template agent dosage on the pore structure and nitrogen content of N-doped mesoporous carbon materials was systematically examined, and the micro-morphology and construction of NMCs were characterized by using X-ray diffractometer (XRD), thermogravimetric analyzer (TGA), and Fourier Transform Infrared Spectroscopy (FTIR), transmission electron microscopy (TEM), specific surface area and pore size analyzer (BET), and X-ray photoelectron spectroscopy (XPS). The analysis of the experimental results shows that N-doped mesoporous carbon materials have developed pores, the morphology of nanoparticles is spherical with an average diameter of about 300-400 nm, there is a worm-like mesoporous construction;as the template agent dosage increases, the nitrogen content gradually decreases from 6.324% to 3.020%. the pore diameter gradually increases at 3.05-6.09 nm, while the pore volume and specific surface area increase then decrease;when the mass ratio of carbon sources to template agent is 6∶ 2 , the specific surface area reaches the maximum value at 868.9 m 2/g, the pore volume is 0.963 cm 3/g .At the same time, the contact angle of mesoporous carbon decreases with the increase of nitrogen content due to the different nitrogen content.