Spectroscopic insights into the binding characteristics of heavy metals to dissolved organic matter in landfill leachate

渗滤液 溶解有机碳 化学 环境化学 有机质 金属 有机化学
作者
Shengzi Duan,Peng Li,Wei Chen,Kim Kofi Kwakye,Kanggen Zhou,Chunying Teng
出处
期刊:Chemosphere [Elsevier BV]
卷期号:352: 141433-141433 被引量:8
标识
DOI:10.1016/j.chemosphere.2024.141433
摘要

Landfill leachate is produced in the process of sanitary landfilling, which contains significant amounts of dissolved organic matter (DOM) and heavy metal contaminants. Insights into the interactions between heavy metals and DOM in landfill leachate are beneficial for the understanding of heavy metal fates and optimization of landfill leachate treatment. In this work, the coherent structural changes of landfill leachate DOM during binding with various heavy metals were explored through the integration of molecular spectroscopic methods with chemometrics and statistic correlation analyses. The results indicate that protein substances, phenolic and discrete carboxyl groups in landfill leachate DOM were involved in the complexation with heavy metals, resulting in the formation of conjugated macromolecules/aggregates with high aromaticity and molecular weight/size. The fluorescent protein-like, fulvic acid-like, and humic-like fractions in DOM were engaged in the interaction, which were closely related to phenolic-like and carboxylic-like structure. Compared to membrane concentrates DOM, raw leachate DOM exhibited a higher binding affinity to heavy metals (especially for Cu2+, whilst the weakest was Cd2+). The integrated approach provides useful information in elucidating the binding processes of metals with landfill leachate DOM, including site heterogeneity, binding strength and functional group sequences.
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