Binding Mechanism Between Fulvic Acid and Heavy Metals: Integrated Interpretation of Binding Experiments, Fraction Characterizations, and Models

In this study, nine fulvic acid fractions (FAs) were obtained by a progressively extracting method from lake sediment and used as adsorbent for binding metal ions. The characterization indicated that former FA fractions had stronger polarity, more O-bearing functional groups, and less aliphaticity....

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Bibliographic Details
Published in:Water, air, and soil pollution air, and soil pollution, 2020-04, Vol.231 (4), Article 184
Main Authors: Zhang, Zhenrui, Shi, Wenjing, Ma, Hua, Zhou, Bin, Li, Hao, Lü, Changwei, He, Jiang
Format: Article
Language:English
Subjects:
Analysis
Atmospheric Protection/Air Quality Control/Air Pollution
Bearing
Binding
Cadmium
Climate Change/Climate Change Impacts
Components
Copper
Earth and Environmental Science
Environment
Environmental monitoring
Fulvic acids
Functional groups
Heavy metals
Humic acid
Hydrogeology
Ions
Lake sediments
Lakes
Lead
Metal ions
Molecular weight
Phenolic compounds
Phenols
Polarity
Principal components analysis
Rankings
Soil Science & Conservation
Sorption
Stability
Stability analysis
Water Quality/Water Pollution
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Summary:In this study, nine fulvic acid fractions (FAs) were obtained by a progressively extracting method from lake sediment and used as adsorbent for binding metal ions. The characterization indicated that former FA fractions had stronger polarity, more O-bearing functional groups, and less aliphaticity. And the results of EEM-PARAFAC indicated that there were four components in FAs, i.e., two humic-like components and two fulvic-like ones. The sorption experiments showed sorption capacity of selected metal ions onto FAs decreased with increasing extractions, and the analysis of binding stability for selected metal ions onto FAs were ranked as FAs-Cu>FAs-Pb>FAs-Cd. For all extracted FAs, the principal component analysis for sorption capacity showed that O-bearing functional groups and molecular weight were dominant factors for FAs binding metal ions. Furthermore, the characterization results of nine FAs pre- and post-adsorption indicated that the phenolic groups of FAs had a greater contribution to bind Pb 2+ over than Cd 2+ and Cu 2+ , while carboxyl and N-bearing groups had a stronger affinity for Cu 2+ than others. The study has the potential significance to insight the FA and metal ions cycling processes in lakes. Graphical Abstract
ISSN:0049-6979
1573-2932
DOI:10.1007/s11270-020-04558-2