基于水热碳化技术的废弃烟末制备水热炭和碳量子点研究

张峻松; 朱鑫超; 王姗姗; 王轶; 张常记; 张乐; 梁淼; 郭鹏

doi:10.12187/2023.04.014

August 2023

Article Contents

ZHANG Junsong, ZHU Xinchao, WANG Shanshan, et al. Preparation of hydrochar and carbon quantum dots from waste tobacco based on hydrothermal carbonization technology[J]. Journal of Light Industry, 2023, 38(4): 105-112. doi: 10.12187/2023.04.014

Citation: ZHANG Junsong, ZHU Xinchao, WANG Shanshan, et al. Preparation of hydrochar and carbon quantum dots from waste tobacco based on hydrothermal carbonization technology[J]. Journal of Light Industry, 2023, 38(4): 105-112. doi: 10.12187/2023.04.014 shu

Preparation of hydrochar and carbon quantum dots from waste tobacco based on hydrothermal carbonization technology

1. College of Tobacco Science and Engineering, Zhengzhou University of Light Industry, Zhengzhou 450001, China;
2. Xiangyang Cigarette Factory, China Tobacco Hubei Industrial Co., Ltd., Xiangyang 441000, China;
3. Shifang Cigarette Factory, China Tobacco Sichuan Industrial Co., Ltd., Shifang 618499, China;
4. Hongta Liaoning Tobacco Co., Ltd., Shenyang 110001, China

Received Date: 2022-09-26
Accepted Date: 2022-11-07

Abstract

In order to explore the high-value resource utilization of waste tobacco powder, the hydrothermal carbonization method was employed to simultaneously convert tobacco powder into hydrochar and carbon quantum dot in one-pot manner. The effect of hydrothermal temperature and reaction time on the combustion performance of hydrochar was investigated. The morphology, structure and properties of the samples were characterized by infrared spectroscopy, X-ray photoelectron spectroscopy, thermogravimetric analysis and fluorescence spectroscopy. The results showed that:With the increase of hydrothermal reaction intensity, the yields of hydrochar decreased, while the fixed carbon content and higher heating value increased. When the reaction temperature and time were 240℃ and 2 h respectively, the higher heating value reached to the highest of 18.66 MJ/kg. SEM analysis showed that the degree of fragmentation of hydrochar increased with the increase of reaction intensity, and carbon microsphere particles were attached to its surface. The infrared spectrum confirmed that the cellulose structure in the waste tobacco powder was continuously decomposed and destroyed during the hydrothermal carbonization process. The thermogravimetric analysis of hydrochar indicated that the combustion processes of hydrochar could be divided into three stages. The weight loss during the fixed carbon combustion stage increased to 31.44% with the increase of hydrothermal reaction intensity, and the ignition temperature and combustion stability of the hydrochar were better than that of the raw tobacco powder. The average particle size of the prepared nitrogen-doped carbon quantum dots was around 2.14~3.02 nm. The particle size distribution was relatively uniform. Moreover, the storage stability of carbon dots was relatively good. The carbon quantum dots exibited a blue fluorescence emission under the excitation wavelength of 365 nm. In addition, the fluorescence emission spectrum showed a wavelength dependence of excitation light, and the fluorescence emission intensity of carbon quantum dots produced under hydrothermal temperature of 200℃ for 4 h was the highest.
- tobacco waste,
- hydrothermal carbonization,
- hydrochar,
- carbon quantum dot,
- combustion performance
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Preparation of hydrochar and carbon quantum dots from waste tobacco based on hydrothermal carbonization technology

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