The Influence of Pyrolysis Temperature and Feedstocks on the Characteristics of Biochar-Derived Dissolved Organic Matter: A Systematic Assessment

Yaru Li, Weipeng Chen, Shu Fang, Zhihua Xu (), Haifeng Weng and Xiaodong Zhang ()
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Yaru Li: School of Environment and Architecture, University of Shanghai for Science and Technology, Shanghai 200093, China
Weipeng Chen: School of Environment and Architecture, University of Shanghai for Science and Technology, Shanghai 200093, China
Shu Fang: School of Environment and Architecture, University of Shanghai for Science and Technology, Shanghai 200093, China
Zhihua Xu: School of Environment and Architecture, University of Shanghai for Science and Technology, Shanghai 200093, China
Haifeng Weng: School of Environment and Architecture, University of Shanghai for Science and Technology, Shanghai 200093, China
Xiaodong Zhang: School of Environment and Architecture, University of Shanghai for Science and Technology, Shanghai 200093, China

Clean Technol., 2024, vol. 6, issue 3, 1-12

Abstract: Biochar is a carbon-rich product obtained by pyrolyzing biomass under oxygen-limited conditions and has a wide range of potential for environmental applications. In particular, dissolved organic matter (DOM) released from biochar has an important impact on the fate of pollutants. The study aimed to systematically assess how varying pyrolysis temperatures and biomass feedstocks influence the characteristics of biochar-derived DOM. DOM samples were comprehensively characterized utilizing UV-vis spectroscopy and excitation–emission matrix (EEM) fluorescence spectroscopy, coupled with parallel factor (PARAFAC) analysis. The study discovered that pyrolysis temperature significantly affects DOM characteristics more than feedstock type. An increase in pyrolysis temperature correlated with a notable decrease in dissolved organic carbon content, aromaticity, and fluorescence intensity, alongside a marked increase in pH and hydrophilicity. PARAFAC analysis identified three distinct DOM components: two humic-like substances (C1 and C2) and one protein-like substance (C3). The proportion of protein-like substances increased with higher pyrolysis temperatures, while the humic-like substances’ proportion declined. The compositional shifts in DOM with pyrolysis temperature may significantly influence its environmental behavior and functionality. Further research is necessary to explore the long-term environmental impact and potential applications of biochar-derived DOM.

Keywords: biochar; dissolved organic matter; spectral characteristics; parallel factor analysis (search for similar items in EconPapers)
JEL-codes: Q2 Q3 Q4 Q5 (search for similar items in EconPapers)
Date: 2024
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