不同气氛热解生物炭可溶性有机碳的光谱特征

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Abstract In order to explore the spectrum characteristics of biochar-derived dissolved organic carbon (BDOC) from different pyrolysis atmospheres, a series of biochar were prepared from wheat straws, with the combination of different pyrolysis atmospheres (CO₂, N₂, or air-limitation) and temperatures (300~750℃). BDOC was then extracted and characterized with ultraviolet-visible spectroscopy and fluorescence parallel factor analysis. We found that The DOC released from biochar was enhanced under the CO₂ (10.55mg/g) and N₂ (10.17mg/g) pyrolysis at 300℃ and also under the air-limited pyrolysis at 450~750℃, resulting in a release of DOC ranging from 0.31~2.88mg/g. The concentration of DOC released from biochar was positively correlated with biochar parameters such as volatile matter content, H/C, and (O+N)/C ratios. In general, air-limitation pyrolysis facilitated the occurrence of BDOC associated with lower molecular weights, or higher aromaticity (SUV₂₅₄: 7.66~16.86) and humification degree (HIX: 10.77~52.21), or humic acid-like substance; while the contents of proteinoids were higher in the BDOC from CO₂ and N₂ pyrolysis. In addition, the spectral characteristics of BDOC were more sensitive to temperature variation under the CO₂ and N₂ atmospheres than under air-limited pyrolysis.

Key words： biochar dissolved organic carbon pyrolysis atmosphere pyrolysis temperature ultraviolet-visible spectroscopy fluorescence parallel factor analysis

Received: 12 October 2022

PACS:	X50
	O657.3

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	Articles by authors
	ZHANG Hui-ying
	CHEN Wei-feng
	YU Shu-han
	XIANG Yu
	QIAN Wei
	YANG Liu-ming
	NI Jin-zhi

Cite this article:

ZHANG Hui-ying,CHEN Wei-feng,YU Shu-han等. Spectral characteristics of dissolved organic carbon from biochar pyrolysis in different atmospheres[J]. CHINA ENVIRONMENTAL SCIENCECE, 2023, 43(6): 2982-2992.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2023/V43/I6/2982

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