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题名: Investigation of free radicals and carbon structures in chars generated from pyrolysis of antibiotic fermentation residue
作者: Hong, Chen; Wang, Zhiqiang; Xing, Yi; Li, Yifei; Yang, Qiang; Jia, Mengmeng; Feng, Lihui
刊名: RSC ADVANCES
出版日期: 2016
卷号: 6, 期号:112, 页码:111226-111232
DOI: 10.1039/c6ra22192k
部门归属: 环境化学与生态毒理学国家重点实验室
英文摘要: The effect of pyrolysis on the chemical characteristics of Antibiotic Fermentation Residue (AFR) was studied in this paper. Electron Spin Resonance (ESR) spectrometry, X-ray photoelectron spectroscopy (XPS) and solid state C-13 nuclear magnetic resonance (C-13 NMR) spectroscopy were applied to investigate the variation of free radicals and carbon structures. Results indicated that the free radical concentration (N-g) of AFR/chars changed dramatically during the pyrolysis process, first increasing and then decreasing. N-g reached 1.24 x 10(19) spins per g in a N-2 atmosphere and 1.11 x 10(19) spins per g in a CO2 atmosphere at 320 degrees C. The g-values monotonically decreased, demonstrating that the chemical structures of free radicals changed during pyrolysis. Bond cleavage in methoxyl groups, aliphatic C-O bonds, aliphatic C-C bonds and C=O groups was enhanced with increasing pyrolysis temperature. These carbon structures converted to aromatic C-O bonds and aromatic C-C bonds through polymerization and condensation reactions. Compared with the CO2 atmosphere, the N-2 atmosphere was more conducive to the production of free radicals and aromatization of carbon structures in chars during pyrolysis process.
收录类别: SCI
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内容类型: 期刊论文
URI标识: http://ir.rcees.ac.cn/handle/311016/35881
Appears in Collections:环境化学与生态毒理学国家重点实验室_期刊论文

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