期刊
RSC ADVANCES
卷 7, 期 33, 页码 20677-20684出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c7ra01497j
关键词
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资金
- National Natural Science Foundation of China [21676293]
- Fundamental Research Funds for the Central Universities (China University of Mining Technology) [2015QNA23]
- Jiangxi Key Laboratory for Mass Spectrometry and Instrumentation (East China Institute of Technology) [JXMS201504]
- Priority Academic Program Development of Jiangsu Higher Education Institutions
Humic acids obtained from a Chinese lignite via alkali treatment were analyzed using Fourier transform infrared spectroscopy and Orbitrap mass spectrometry coupled with an electrospray ion source (ESI-Orbitrap-MS). Raw coal and the corresponding residue were characterized via scanning electron microscopy and energy dispersive spectrometry. Over 4700 heteroatom-containing compounds with wide distributions of molecular mass and unsaturation degree were detected via the ESI-Orbitrap-MS, and around 60 percent of the detected species were found to be oxygen-containing compounds. In addition, van Krevelen diagram and double-bond equivalent (DBE) plot were introduced to provide more structural details of the compounds. For the species only containing C, H, and O (HA(CHO)), condensed aromatic compounds with a DBE value over 20 only contained 1 or 2 oxygen atoms. Carboxyl-and hydroxyl-containing aliphatic compounds (CHCACs) were predominant in HACHO with 5 or 6 oxygen atoms. Both the CHCACs and aromatic carboxylic acids or phenols were grouped into clusters in the van Krevelen diagram to be recognized. The introduction of a nitrogen atom to the HACHO species was based on the structures of the HACHO species, which is also indicated by the van Krevelen diagram.
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