Spectral characteristics of dissolved organic carbon from biochar pyrolysis in different atmospheres
ZHANG Hui-ying, CHEN Wei-feng, YU Shu-han, XIANG Yu, QIAN Wei, YANG Liu-ming, NI Jin-zhi
Key Laboratory of Humid Subtropical Eco-geographical Process of the Ministry of Education, School of Geographical Science, Fujian Normal University, Fuzhou 350007, China
Abstract：In order to explore the spectrum characteristics of biochar-derived dissolved organic carbon (BDOC) from different pyrolysis atmospheres, a series of biochar were prepared from wheat straws, with the combination of different pyrolysis atmospheres (CO2, N2, or air-limitation) and temperatures (300~750℃). BDOC was then extracted and characterized with ultraviolet-visible spectroscopy and fluorescence parallel factor analysis. We found that The DOC released from biochar was enhanced under the CO2 (10.55mg/g) and N2 (10.17mg/g) pyrolysis at 300℃ and also under the air-limited pyrolysis at 450~750℃, resulting in a release of DOC ranging from 0.31~2.88mg/g. The concentration of DOC released from biochar was positively correlated with biochar parameters such as volatile matter content, H/C, and (O+N)/C ratios. In general, air-limitation pyrolysis facilitated the occurrence of BDOC associated with lower molecular weights, or higher aromaticity (SUV254: 7.66~16.86) and humification degree (HIX: 10.77~52.21), or humic acid-like substance; while the contents of proteinoids were higher in the BDOC from CO2 and N2 pyrolysis. In addition, the spectral characteristics of BDOC were more sensitive to temperature variation under the CO2 and N2 atmospheres than under air-limited pyrolysis.
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