Xu Yuanjun, Xia Maosheng, Jiang Yinshan, Li Fangfei, Xue Bing
Key Laboratory of Automobile Materials, Ministry of Education, Department of Materials Science and Engineering, Jilin University No. 5988 People's Avenue Changchun 130025 People's Republic of China
RSC Adv. 2018 Jun 4;8(36):20095-20107. doi: 10.1039/c8ra01138a. eCollection 2018 May 30.
Hydrothermal carbon nanospheres were prepared by introducing opal into the hydrothermal carbonization system of hydroxypropyl methyl cellulose (HPMC). Then the effects of opal on hydrothermal carbonization of HPMC were investigated after different reaction durations (105-240 min). The reaction products were characterized by elemental analysis, gas chromatography-mass spectrometry (GC-MS), scanning electron microscopy (SEM), energy dispersive X-ray spectroscopy (EDS), Fourier transform infrared spectroscopy (FT-IR) and N adsorption-desorption. Results of elemental analysis indicated that the H (hydrogen) and O (oxygen) content of HPMC decreased through dehydration, demethylation, decarbonylation and hydrolysis reactions, forming hydrochar with higher carbon content. The addition of opal was confirmed to accelerate the hydrolysis of HPMC. N adsorption-desorption tests and SEM analysis showed that opal with a large specific surface area adsorbed HPMC hydrolysis products, such as furans, and facilitated furan cyclodehydration on its surfaces to form cross-linked carbons, which contributed to the quick formation of hydrochar. Moreover, the adsorption by opal also inhibited hydrochar aggregation, so the final hydrothermal carbon spheres had sizes of 20-100 nm.
通过将蛋白石引入羟丙基甲基纤维素（HPMC）的水热碳化体系中来制备水热碳纳米球。然后在不同反应时长（105 - 240分钟）后，研究蛋白石对HPMC水热碳化的影响。通过元素分析、气相色谱 - 质谱联用仪（GC - MS）、扫描电子显微镜（SEM）、能量色散X射线光谱仪（EDS）、傅里叶变换红外光谱仪（FT - IR）和N吸附 - 脱附对反应产物进行表征。元素分析结果表明，HPMC中的H（氢）和O（氧）含量通过脱水、脱甲基、脱羰基和水解反应而降低，形成了碳含量更高的水热炭。证实蛋白石的添加加速了HPMC的水解。N吸附 - 脱附测试和SEM分析表明，具有大比表面积的蛋白石吸附了HPMC水解产物，如呋喃，并促进了呋喃在其表面的环脱水以形成交联碳，这有助于水热炭的快速形成。此外，蛋白石的吸附还抑制了水热炭的聚集，因此最终的水热碳球尺寸为20 - 100纳米。
