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Characteristics of dissolved organic matter composition in biochar: Effects of feedstocks and pyrolysis temperatures

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Abstract

Biochar has widely used in soil pollution remediation due to its advantages of high efficiency and environmental sustainability. Dissolved organic matter (DOM) released by biochar plays a non-negligible role in the migration and transformation of pollutants in environment, and its composition was regarded as main impact factor. In this study, 28 biochar were investigated to detect the effect of pyrolysis temperature and feedstock on DOM content and components. Results showed that the content of DOM released from biochar at low pyrolysis temperatures (300–400 ℃) was higher than that from high pyrolysis temperatures (500–600 ℃). In addition, the specific UV–Visible absorbance at 254 nm (SUVA254) results expressed that DOM from peanut shell biochar (PSBC), rice husk biochar (RHBC) and bamboo biochar (BBC) had higher humification at high temperatures. Moreover, one fulvic acid-like (C2) and two humic acid-like (C1, C3) substances were main fluorescent components of biochar-derived DOM identified by parallel factor analysis based on excitation emission matrices fluorescence spectroscopies (EEM-PARAFAC). With the increase of pyrolysis temperature, humic acid substances content gradually decreased. The correlation analysis results revealed that pyrolysis temperatures and O/C, H/C, DOM content, the biological index (BIX), humification index (HIX), C1% and C3% was negatively correlated (p < 0.001). Thus, the pyrolysis temperatures take important roles in composition of DOM released from biochar, and this research would provide a reference for the application of biochar in the environment.

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The data is available on request from corresponding author.

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Funding

This work was financially supported by the National Natural Science Foundation of China (41977337), the Natural Science Foundation of Chongqing of China (CSTB2022NSCQ-MSX0394), the Science and Technology Research Program of Chongqing Municipal Education Commission (No. KJQN202000743) the Graduate Education Innovative Found Program of Chongqing Jiaotong University (CYB21220).

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Jianxin Fan conceived and designed the experiments and methodology; Jianxin Fan, and Ting Duan performed experiments and data curation; Jianxin Fan and Ting Duan completed the formal analysis; Jianxin Fan and Jiaoxia Sun contributed the resources and visualization; Jianxin Fan, Ting Duan and Lan Zou completed the writing-original draft and writing-review & editing. Jianxin Fan and Jiaoxia Sun implemented the supervision. Jianxin Fan carried out the project administration and funding acquisition. All the authors approved the final manuscript.

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Correspondence to Jianxin Fan.

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Authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper.

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Responsible Editor: Zhihong Xu

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Fan, J., Duan, T., Zou, L. et al. Characteristics of dissolved organic matter composition in biochar: Effects of feedstocks and pyrolysis temperatures. Environ Sci Pollut Res 30, 85139–85153 (2023). https://doi.org/10.1007/s11356-023-28431-x

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  • DOI: https://doi.org/10.1007/s11356-023-28431-x

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