不同气氛热解生物炭可溶性有机碳的光谱特征

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摘要为探明不同气氛热解生物炭可溶性有机碳(BDOC)的性质特征,在不同热解气氛(CO₂、N₂和空气限制)和热解温度(300~750℃)下制备了一系列小麦秸秆生物炭,通过提取其BDOC并结合紫外-可见光谱和荧光光谱-平行因子分析方法对BDOC性质进行分析.热解温度为300℃时,CO₂和N₂热解生物炭释放的DOC含量高(CO₂:10.55mg/g,N₂:10.17mg/g);而热解温度为450~750℃时,空气限制热解生物炭释放的DOC含量高(0.31~2.88mg/g).生物炭释放DOC含量与生物炭的挥发性物质含量、H/C和(O+N)/C呈正相关关系.空气限制热解BDOC具有更低的分子量,更高的芳香性(SUVA₂₅₄范围:7.66~16.86),腐殖化程度(HIX范围:10.77~52.21)和类腐殖酸物质含量,而CO₂和N₂热解BDOC含有更多的类蛋白物质.此外,CO₂和N₂气氛热解BDOC光谱特征的温度变异性大于空气限制热解.

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	张慧颖
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	余姝含
	向宇
	钱伟
	杨柳明
	倪进治

关键词 ：生物炭, 可溶性有机碳, 热解气氛, 热解温度, 紫外-可见光谱, 荧光光谱-平行因子分析

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

收稿日期: 2022-10-12

PACS:	X50
	O657.3

基金资助:国家自然科学基金(42077130);福建省自然科学基金(2020J01137,2022R1002003)

通讯作者: 倪进治,研究员,nijz@fjnu.edu.cn E-mail: nijz@fjnu.edu.cn

作者简介: 张慧颖(1995-),女,河南周口人,福建师范大学博士研究生,研究方向为污染生态学.发表论文7篇.ying_zz1995@163.com

引用本文:

张慧颖, 陈卫锋, 余姝含, 向宇, 钱伟, 杨柳明, 倪进治. 不同气氛热解生物炭可溶性有机碳的光谱特征[J]. 中国环境科学, 2023, 43(6): 2982-2992. ZHANG Hui-ying, CHEN Wei-feng, YU Shu-han, XIANG Yu, QIAN Wei, YANG Liu-ming, NI Jin-zhi. Spectral characteristics of dissolved organic carbon from biochar pyrolysis in different atmospheres. CHINA ENVIRONMENTAL SCIENCECE, 2023, 43(6): 2982-2992.

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http://www.zghjkx.com.cn/CN/ 或 http://www.zghjkx.com.cn/CN/Y2023/V43/I6/2982

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