Complexation Between Cu(Ⅱ) and Dissolved Organic Matter from Biochar
ZHANG Jun1,2, WANG Wei1,2, CHU Gang1,2, ZHOU Dandan1,2, ZHAO Jing1,2, WANG Lin1,2, LI Fangfang1,2
1 Faculty of Environmental Science and Engineering,Kunming University of Science and Technonlogy, Kunming 650500, China 2 Yunnan Provincial Key Laboratory of Soil Carbon Sequestration and Pollution Control, Kunming 650500, China
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.
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2021, Vol. 35 
