燃烧生成棕色碳的三维荧光光谱分析

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Abstract 11 common substances, including straw, wood, coal, waste paper and waste plastics, were employed to simulate combustion in the laboratory and the methanol soluble organic matters (MSOM) in smoke were collected. The brown carbon in MSOM was characterized by UV-Vis and three-dimensional fluorescence spectroscopy (EEMs). Furthermore, non-negative matrix decomposition (NMF) was used to extract the characteristic excitation/emission spectra of main components of EEM, aiming to establish the basis of brown carbon traceability. The results show that the UV-vis spectra of straw and wood burning source brown carbon were similar with a shoulder peak at 265nm. The absorption of brown carbon from corrugated board and plastic combustion sources decreases singly with increasing wavelength. Due to the same basic components, the EEM of brown carbon corresponding to biomass and paperboard had similar profiles. NMF analysis showed three main fluorescent components in MSOM of biomass and paperboard, which were two humus C1, C2 and protein-like C3, respectively. The EEM of coal has a strong distribution in the long wave, which can be attributed to aromatic groups. From its EEM, the M1, M2 and M3 fluorophores can be decomposed and their positions are redshifted compared to those of biomass. According to fluorophore position and spectral signal profile, biomass and coal can be distinguished. Foam, plastic bag and plastic bottle are organic polymer materials and their EEM is quite different from that of biomass. The MSOM of foam and plastic bag contains four fluorescent components, while the MSOM of plastic bottle can only get two fluorophore groups with obvious characteristics.

Key words： brown carbon burning excitation emission matrix UV-vis spectrum non-negative matrix factorization source

Received: 28 February 2022

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X513

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	Articles by authors
	DENG Ru-le
	GAO Peng
	JIA Song
	WANG Xue-fei

Cite this article:

DENG Ru-le,GAO Peng,JIA Song等. Comparisons of three - dimensional fluorescence spectra of brown carbon from combustion[J]. CHINA ENVIRONMENTAL SCIENCECE, 2022, 42(9): 3983-3990.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2022/V42/I9/3983

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