Pyrolysis Temperature-Dependent Changes in the Characteristics of Biochar-Borne Dissolved Organic Matter and Its Copper Binding Properties
- 369 Downloads
The dissolved organic matter (DOM) samples from biochars produced from Jerusalem artichoke stalks by pyrolysis at 300, 500, and 700 °C were characterized using a combination of spectroscopic techniques. Additionally, the binding affinities (long KM) and the complexation capacities (CL) of the DOM samples with Cu(II) were calculated to assess their Cu binding properties. The biochar-borne DOM contained mainly humic-like components (C1–C3) with a small amount of a protein-like component (C4). As the charring temperature increased, the concentrations of released DOM decreased. The low temperature biochar-borne DOM was found to have more carboxyl groups than its high temperature counterparts, and thus it had larger CL values. In contrast, the high temperature biochar-borne DOM had larger long KM values. Low temperature biochars, if applied in a large quantity, would alter copper mobility in the environment because of their high DOM contents and large copper binding capacities.
KeywordsBiochar DOM EEM PARAFAC C K-NEXAFS Copper-binding
This research was supported by the National Natural Science Foundation of China (41501522), the Chinese National Key Research and Development Program (2016YFD0200303 and 2016YFE0106400), and the National High Technology Research and Development Program (2012AA06A204-4).
- Harvey OR, Herbert BE, Kuo LJ, Louchouarn P (2012) Generalized two-dimensional perturbation correlation infrared spectroscopy reveals mechanisms for the development of surface charge and cecalcitrance in plant-derived biochars. Environ Sci Technol 46:10641–10650. https://doi.org/10.1021/es302971d CrossRefGoogle Scholar
- Hu B, Wang PF, Wang C, Qian J, Hou J, Cui XA, Zhang NN (2017) The effect of anthropogenic impoundment on dissolved organic matter characteristics and copper binding affinity: Insights from fluorescence spectroscopy. Chemosphere 188:424–433. https://doi.org/10.1016/j.chemosphere.2017.09.023 CrossRefGoogle Scholar
- Schumacher M (2005) Microheterogeneity of soil organic matter investigated by C-1 s NEXAFS spectroscopy and X-ray microscopy. Dissertation, Swiss Federal Institute of Technology ZurichGoogle Scholar
- Wei J, Han L, Song J, Chen MF (2015) Evaluation of the interactions between water extractable soil organic matter and metal cations (Cu(II), Eu(III)) using Excitation–Emission matrix combined with parallel factor analysis. Int J Mol Sci 16:14464–14476. https://doi.org/10.3390/ijms160714464 CrossRefGoogle Scholar