Yang Mannan, Su Jian, Fang Changqing, Cheng Youliang, Li Yangyang, Yan Yubo, Lei Wanqing
School of Mechanical and Precision Instrument Engineering, Xi'an University of Technology, Xi'an 710048, China.
Faculty of Printing, Packaging Engineering and Digital Media Technology, Xi'an University of Technology, Xi'an 710054, China.
Molecules. 2023 Jul 30;28(15):5756. doi: 10.3390/molecules28155756.
As a kind of biomass resource, waste office paper can be used as a carbon precursor to prepare carbon materials. In this work, carbon microspheres with regular shape, uniform particle size and high carbon content were successfully prepared from waste office paper via a hydrothermal synthesis method with sulfuric acid as the catalyst. The effects of reaction temperature and sulfuric acid dosage on the morphology of the carbon microspheres were studied. The formation mechanism of the carbon microspheres was investigated by analyzing the structure and composition of the products. The results show that the hydrolysis of cellulose in waste paper under hydrothermal conditions was the key for the formation of carbon microspheres. The temperature of hydrothermal reaction and the use of sulfuric acid can affect the morphology of carbon microspheres. The carbon microspheres synthesized at 210 °C with 10 mL sulfuric acid have the best surface morphology, with uniform particle size and higher dispersion. Cyclic voltammetry and electrochemical impedance spectroscopy show that the carbon microspheres have good capacitance performance and can be used in capacitors. This study provides a low-cost precursor for carbon microspheres as well as a new method for the recycle of waste paper.
作为一种生物质资源，废弃办公用纸可作为碳前驱体用于制备碳材料。在本工作中，以硫酸为催化剂，通过水热合成法成功地从废弃办公用纸制备出形状规则、粒径均匀且碳含量高的碳微球。研究了反应温度和硫酸用量对碳微球形貌的影响。通过分析产物的结构和组成，探讨了碳微球的形成机理。结果表明，废纸中纤维素在水热条件下的水解是碳微球形成的关键。水热反应温度和硫酸的使用会影响碳微球的形貌。在210℃下用10 mL硫酸合成的碳微球具有最佳的表面形貌，粒径均匀且分散性较高。循环伏安法和电化学阻抗谱表明，该碳微球具有良好的电容性能，可用于电容器。本研究为碳微球提供了一种低成本的前驱体，同时也为废纸回收利用提供了一种新方法。
