期刊
JOURNAL OF ANALYTICAL AND APPLIED PYROLYSIS
卷 151, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.jaap.2020.104941
关键词
Algal-biomass; Biochar; Persistent free radicals; Habitats; Correlation analyses
资金
- National Key Research and Development Program of China [2018YFC1800600]
- National Natural Science Foundation of China [21677075]
- Natural Science Foundation of Jiangsu Province, China [BK20181261]
Biomass feedstock plays an important role in the formation of environmentally persistent free radicals (EPFRs) in biochars; however, no investigations have been done on the effects of different plant habitats on the formation of EPFRs, especially for algae. Therefore, Laminaria japonica, a large-scale artificially planted marine economic macroalgae, was collected from six different coastal mariculture zones in tropical, subtropical and north-temperate zones from south to north in China. Biochars were obtained at the pyrolysis temperatures of 200-700 degrees C, and EPFR signs were recorded by an X-band electron paramagnetic resonance (EPR) spectrometer. Temperatures of 300-500 degrees C were the appropriate for higher levels of spin concentrations, and lower (200 degrees C) and higher (600-700 degrees C) temperatures decreased the biochar-bound EPFRs. The types of EPFRs generally belonged to oxygen-centered radicals for biochars produced at 200 and 300 degrees C, a mixture of carbon- and oxygen-centered radicals for 400 degrees C biochar, and carbon-centered radicals for 500-700 degrees C biochars. Different habitats (growth environments) of L. japonica influenced the levels rather than the types of the resulting biochar-bound EPFRs. Pearson correlation analyses showed that biochar-bound EPFRs were significantly positively correlated with the contents of C (p < 0.01) and weakly correlated with the contents of H, N, O and transition elements (Cu, Fe, Mn, Co, Cr, Ni, and Zn) (p > 0.05). Overall, algae biomass-based biochars have the similar levels and types of EPFRs as lignocellulosic-biomass-based biochars, and the different growing habitats of L. japonica grown influence the formation and characteristics of EPFRs in the resulting biochars.
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