期刊
MICROPOROUS AND MESOPOROUS MATERIALS
卷 280, 期 -, 页码 57-65出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.micromeso.2019.01.042
关键词
Lignin; Porous carbon; Microwave; CO2 uptake
类别
资金
- start-up funds for scientific research in Nanjing Forestry University [163020126]
- National Science and Technology Achievements Project in Forestry [[2016]42]
- Natural Science Foundation of Jiangsu Province [BK20161524]
- National Natural Science Foundation of China [31400515]
- Priority Academic Program Development of Jiangsu Higher Education Institutions (PAPD)
- Qing Lan Project
Conventional two-step synthesis (carbonization followed by activation) of porous carbon required long heating duration at high temperature, leading to high energy consumption. To obtain carbon with hierarchical porous structure, a templating method was typically used. In view of the above drawbacks, this study provided a template-free and fast one-step synthesis from enzymatic hydrolysis lignin to hierarchical porous carbon by microwave heating in humidified nitrogen. It was shown that moisture in humidified nitrogen acts as a physical activating agent combined with KOH to achieve a hierarchical porous structure consisting of abundant micropores and considerable meso-/macropores. The results show high dependency of porosity, amorphous structure, and surface chemical properties of porous carbon samples on microwave heating duration. In particular, a porous carbon with a prominent hierarchical pore structure (65.3% mesopores), high specific surface area (2870 m(2)/g) and total pore volume (2.02 cm(3)/g) was synthesized using a microwave heating duration of 30 min. Under this condition, a high content of O-C=O group (10.0%) was also achieved, implying the presence of a hydrophilic carbon surface. These properties of prepared porous carbon synergistically enhance its CO2 uptake (up to 1.31 mmol/g measured by thermogravimetric analyzer at 30 degrees C). This time-saving and energy efficient synthesis of hierarchical porous carbon could be an effective approach to utilize industrial lignin waste to reduce greenhouse gas emission.
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