Abstract
Dissolved organic matter (DOM), as the most active organic carbon in the soil, has a coherent affinity with heavy metals from inherent and exogenous sources. Although the important roles of DOM in the adsorption of heavy metals in soil have previously been demonstrated, the heterogeneity and variability of the chemical constitution of DOM impede the investigation of its effects on heavy metal adsorption onto soil under natural conditions. Fresh DOM (FDOM) and degraded DOM (DDOM) from sugarcane rind were prepared, and their chemical properties were measured by Fourier-transform infrared spectrometry (FTIR), excitation-emission matrix (EEM) fluorescence spectroscopes, nuclear magnetic resonance (NMR), and molecular weight distribution (MWD). They were also used in batch experiments to evaluate their effects on the adsorption of Cu(II) onto farmland red soil. Based on our results, the chemical structure and composition of DDOM greatly varied; compared with FDOM, the C/O ratio (from 24.0 to 9.6%) and fluorescence index (FI) (from 1.4 to 1.0) decreased, and high molecular weight (>10 kDa) compounds increased from 23.18 to 70.51%, while low molecular weight (<3 kDa) compounds decreased from 56.13 to 12.13%; aromaticity and humification degree were markedly enhanced. The discrepancy of FDOM and DDOM in terms of chemical properties greatly influenced Cu(II) adsorption onto red soil by affecting DOM-Cu(II) complex capacity. The FDOM inhibited the adsorption of Cu(II), while DDOM promoted adsorption, which was significantly influenced by soil pH. Maximum adsorption capacity (Q m) was 0.92 and 5.76 mg g−1 in the presence of FDOM and DDOM, respectively. The adsorption process with DDOM could be better described by the Langmuir model, while that with FDOM was better described by the Freundlich model. The impacts caused by the dynamic changes of the chemical properties of DOM under natural conditions should therefore be considered in the risk assessment and remediation of soils contaminated with heavy metals.
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Acknowledgments
The authors gratefully acknowledge the financial support by the National Natural Science Foundation of China (41502240), the Natural Science Basic Research Plan in Shaanxi Province of China (2017JM4005), the Fundamental Research Funds for the Central Universities (3102017zy056), the Key Laboratory of Groundwater Contamination and Remediation, China Geological Survey (CGS) & Hebei Province (KF201610), and the Seed Foundation of Innovation and Creation for Graduate Students in Northwestern Polytechnic University (Z2017192).
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Hu, S., Wu, Y., Yi, N. et al. Chemical properties of dissolved organic matter derived from sugarcane rind and the impacts on copper adsorption onto red soil. Environ Sci Pollut Res 24, 21750–21760 (2017). https://doi.org/10.1007/s11356-017-9834-3
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DOI: https://doi.org/10.1007/s11356-017-9834-3