期刊
SCIENCE OF THE TOTAL ENVIRONMENT
卷 715, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.scitotenv.2020.136575
关键词
Rice straw; Pyrolysis kinetics; Lignin; Persistent free radicals
资金
- National Natural Science Foundation of China [U1602231, 41725016, 41673098, 4181101459]
- Yunnan Provincial Scientific Innovation Team of Soil Environment and Ecological Safety, Kunming University of Science and Technology [2019HC008]
The presence of persistent free radicals (PER) in biochars may greatly broaden the application of biochars in pollution control, but may also cause negative impacts to the environment. Understanding the structural basis and the formation mechanisms of PFR is essential for a targeted biochar production and application. This study used rice straw (RS), a ubiquitous agricultural waste, to investigate the generation processes of PFR in relation to RS pyrolysis kinetics. Based on a detailed thermogravimetric (TG) and derivative thermogravimetric (DTG) analysis, the activation energy was calculated by Kissinger-Akahira-Sunose (KAS) and Flynn-Wall-Ozawa (FWO) methods. This work combined pyrolysis kinetics analysis and solid particle characterization. Our results showed that lignin started to pyrolyze at a lower temperature than cellulose and hemicellulose. Lignin was the main factor for PER generation. Chemical bond breaking contributed only slightly to PER formation. The reconfiguration of the carbonaceous structures may be a more important contributor to PER formation, while the cross-linking between different compositions and the interactions between the chemical compositions and inorganic minerals may play a significant role for PER generation and stabilization in RS. This study provides useful theoretical basis to understand the thermal pyrolysis process of RS and the manipulation of biochar properties. (C) 2020 Elsevier B.V. All rights reserved.
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