Abstract
Comprehensive assessment of the dissolved organic matter (DOM) released from biochar is essential because it affects the migration and transformation of pollutants. The pyrolysis temperature and feedstock are the main factors affecting the amount and structure of DOM released from biochar. In this study, biochar-derived DOM was produced from three feedstocks at five temperatures (200–600 °C), and the effects of the pyrolysis temperature and feedstock on its components were investigated using UV–vis, Synchronous fluorescence, excitation emission matrix-parallel factor (EEM-PARAFAC) analysis and Fourier transform infrared-two-dimensional-correlation spectroscopy (FTIR-2D-COS). It was found that the biochar-derived DOM contents of the fruit peel and dewatered sludge biochar gradually decreased with increasing pyrolysis temperature; however, the DOM content of fresh human manure biochar increased at 600 °C, and a higher DOM content was obtained at low temperatures. The SUVA254 and SUVA260 shown that most of the aromatic substances in the DOM existed in the hydrophobic fraction. Moreover, the DOM mainly contained humic acid-like substances and protein-like substances. As the pyrolysis temperature increased, the protein-like and humic acid substances exhibited opposite trends, with higher protein-like contents at high temperatures. In addition, based on the FTIR-2D-COS analysis, the variations in the functional groups of the DOM depended on the pyrolysis temperature and the type of feedstock. This study highlights the importance of combining multiple optical techniques to evaluate biochar-derived DOM and provides valuable information for biochar applications.
Published Version
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
