生物炭中溶解性有机质与Cu(Ⅱ)的络合机制研究

doi:10.11896/cldb.20060283

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Abstract Biochar is a solid product produced by pyrolysis of waste biomass under anaerobic oxygen conditions. Because of its porosity, large specific surface area, rich oxygen-containing functional groups, rich minerals and so on, biochar has been widely used in the remediation of heavy metal contaminated soils. The migration effect of biochar on heavy metals is affected by not only the properties of heavy metals and the solid particles of biochar, but also the dissolved organic matter from biochar. Dissolved organic matter(DOM) from biochars has significant mobility after the application of biochars in the environment. The interaction between functional groups of DOM and heavy metals is an important mechanism of heavy metal migration and transformation. The characteristics of DOM are determined by the raw materials of biochars and pyrolysis temperature. However, DOM characteristics as affected by the interaction between DOM and heavy metals were not extensively studies. Therefore, in-depth study of the interaction between biochar DOM and heavy metals is essential to assess the impact of biochar on the migration of heavy metals. In this study, a variety of spectroscopic techniques were used to explore the composition of DOM in biochar and its complexing characteristics with Cu(Ⅱ). The results showed that the SUVA₂₅₄ DOM and SUVA₂₆₀ DOM belonged to hydrophilic materials with very low aromaticity, and the concentration of MDOM was higher than that of PDOM. The EEM identified that the mainly composed of DOM were fulvic-like acid and humic-like acid. The MDOM has more fluorescent substances (fulvic-like acid and humic-like acid) that provide binding sites for Cu(Ⅱ), thus making the complexation stability constant higher than PDOM. ¹H-NMR proved that the phenolic hydroxyl groups of DOM have obvious complexation with Cu(Ⅱ).This study will provide a screening basis for the application of biochar as a functional material in environmental remediation, and reduce its environmental risk.

Key words： biochar dissolved organic matter (DOM) Cu(Ⅱ) fluorescence quenching bound characterization

Published: 25 November 2021 Online: 2021-12-13

CLC number:

X131.2

Fund:National Natural Science Foundation of China (41703121, 41703111), the Personnel Start-up Fund of Kunming University of Science and Technology (KKSY201722006,KKSY201506058), and the Yunnan Provincial Key Research and Development Program, China (2018BC004).

About author: Jun Zhangreceived his bachelor's degree in Ludong University in 2015 and his master's degree in Kunming University of Science and Technology in 2019. He has published 6 academic papers in domestic and foreign academic journals. In recent work, he focused on studying the environmental behavior mechanism of heavy metal pollutants. He participated in one National Natural Science Foundation of China project and one provincial project.
Dandan Zhou, an associate professor and postgraduate tutor at Kunming University of Science and Technology,received her Ph.D. degree in materials science and engineering from the Kunming University of Science and Technology (KMUST) in September 2011 to June 2016. Her research interests focus on the carbon-based materials, and the fundamental theory & application about the environmental behavior of pollutants controlling. She has published more than 25 journal papers, 9 and 2 of which were cited by SCI and EI respectively, and applied 7 national patents. She presided 1 National Natural Science Foundation project and 1 provincial level project. As a key researcher, she participated in a National Key Research and Development Project and one Key Research and Development Project of Yunnan Province, China.

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	ZHANG Jun
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	CHU Gang
	ZHOU Dandan
	ZHAO Jing
	WANG Lin
	LI Fangfang

Cite this article:

ZHANG Jun,WANG Wei,CHU Gang, et al. Complexation Between Cu(Ⅱ) and Dissolved Organic Matter from Biochar[J]. Materials Reports, 2021, 35(22): 22160-22165.

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http://www.mater-rep.com/EN/10.11896/cldb.20060283 OR http://www.mater-rep.com/EN/Y2021/V35/I22/22160

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