高比表面积六方氮化硼纳米纤维的高效合成

Hongshou Liu, Zhaoqian Yan, Zhihao Sun, Anran Li, Zihao Guo, Lei Qian
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引用次数: 7

摘要

以硼酸、三聚氰胺和聚乙二醇(PEG)为原料,采用前驱体热解法制备了高比表面六方氮化硼纳米纤维。场发射扫描电镜图像显示,六方氮化硼纳米纤维排列良好,具有良好的纤维结构。利用x射线衍射、傅里叶红外光谱和热重分析了合成的氢氮化硼纳米纤维的化学成分。考察并优化了前驱体干燥方式和聚乙二醇含量对形貌和比表面积的影响。结果表明,随着硼酸与三聚氰胺的比例增加,h-BN纳米纤维的直径增大,经冷冻干燥处理后,其纵横比由20提高到30。经冷冻干燥处理后,h-BN纳米纤维的比表面积由65.25 m2 /g提高到319.07 m2 /g。此外,PEG的加入也明显提高了比表面积。当PEG含量达到2%时,h-BN纳米纤维的比表面积增加了12.4倍,达到874.58 m2 /g。所得氢氮化硼纳米纤维在催化、储氢和环境等领域具有广阔的应用前景。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Highly Efficient Synthesis of Hexagonal Boron Nitride Nanofibers with High Specific Surface Area
Hexagonal boron nitride nanofibers with high specific surface were successfully prepared through precursor pyrolysis method via boric acid, melamine and polyethylene glycol (PEG) as raw materials. The field emission scanning electron microscopy images showed that hexagonal boron nitride (h-BN) nanofibers were well aligned, and exhibited good fibrous structure. Chemical composition of the synthesized h-BN nanofibers was analyzed by X-ray diffraction, fourier transform infrared spectroscopy and thermogravimetric. Effects of precursor drying method and the PEG contents on morphologies and the specific surface area were investigated and optimized. Results indicated that the diameter of h-BN nanofibers increased with the ratio of boric acid to melamine, and their aspect ratios were greatly improved from 20 to 30 after freeze-drying treatment. Specific surface area of the h-BN nanofibers was increased from 65.25 to 319.07 m 2 /g due to the freeze-drying treatment. Besides, the content of PEG also obviously improved specific surface area. When the PEG content reached 2%, specific surface area of the h-BN nanofibers from the air-dried precursor was increased by 12.4 times to 874.58 m 2 /g. The resulted h-BN nanofibers show promising and potential applications in many fields including catalysis, hydrogen storage and environment.
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