☆ 4.7 Article

Comparison of copper binding properties of DOM derived from fresh and pyrolyzed biomaterials: Insights from multi-spectroscopic investigation

SCIENCE OF THE TOTAL ENVIRONMENT (2020)

Journal

SCIENCE OF THE TOTAL ENVIRONMENT

Volume 721, Issue -, Pages -

Publisher

ELSEVIER

DOI: 10.1016/j.scitotenv.2020.137827

Keywords

Fresh biomaterials; Biochar; Dissolved organic matter; Cu(II) binding; Multi-spectroscopic analyses

Funding

Major Program for Water Pollution Control and Management [2017ZX07603-005]
National Natural Science Foundation of China [41877544, 41703078, 41877482]
project of Collaborative Innovation Center of Technology and Material of Water Treatment

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Abstract

The binding of dissolved organic matter (DOM) with metals affects the latter's biogeochemical processing in the environment. This study used multi-spectroscopic analyses to compare the heterogeneities of the Cu(II) binding properties of DOM derived from fresh and pyrolyzed biomaterials. The results showed that the DOM derived from fresh macrophyte (MDOM) and their corresponding biochar (BDOM) consisted mostly of protein-like and humic-like substances, respectively. The stability constant (log K-M) of protein-like matter in the MDOM was 5.27, and the values of humic-like components in the BDOM were 4.32-5.15. Compared with the MDOM, the BDOM exhibited lower affinities and active binding sites for Cu(II). In addition, the BDOM contents decreased after pyrolysis. Therefore, the pyrolysis of fresh biomaterials into biochar is a promising method for reducing the potential migration risk posed by Cu(II) due to the MDOM being a positive carrier for Cu(II) contamination. Polysaccharide was the only functional group that participated in the binding of Cu(II) in both MDOM and BDOM. Aliphatic groups and amides associated with protein-like matter were responsible for the Cu(II) binding to MDOM, whereas phenolic and aromatic groups mainly participated in the complexation of BDOM-Cu(II). The C-O group of amide I in the MDOM, and polysaccharide in the BDOM, showed the fastest response to Cu(II). This study was helpful for elucidating the effects of fresh and pyrolyzed biomaterials (biochars) on the environmental behavior of Cu(II) at the molecular level. (C) 2020 Elsevier B.V. All rights reserved.

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Interaction between biochar-dissolved organic matter and chlorophenols during biochar adsorption

Jin Zhang, Nannan Huang, Hui Li, Biao Cheng, Xuan Zhou, Chen Wang

Summary: This study investigated the interaction between biochar dissolved organic matter (BDOM) and 2,4,6-trichlorophenol (TCP) using fluorescence spectroscopy and multiple models. The results showed that protein- and fulvic-like components were the major interacting materials with TCP in BDOM. The static quenching mechanism dominated the interaction between BDOM and TCP, and the binding order of fluorescent components followed the sequence of protein-like -> short-wavelength fulvic-like -> long-wavelength fulvic-like -> humic-like components. These findings provide insights for selecting biochar as a remediation material for chlorophenols and understanding the environmental behavior of leached dissolved organic matter during biochar application.

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