期刊
ENVIRONMENTAL SCIENCE & TECHNOLOGY
卷 53, 期 23, 页码 13841-13849出版社
AMER CHEMICAL SOC
DOI: 10.1021/acs.est.9b03261
关键词
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资金
- National Key Research and Development Plan of China [2017YFD0800303]
- National Natural Science Foundation of China [41571130061, 41722303]
- Jiangsu Natural Science Foundation for Distinguished Young Scholars [BK20150018]
- Chinese Academy of Sciences' State Key Laboratory of Environmental Geochemistry [SKLEG2019712]
- Jiangsu Postdoctoral Science Foundation [2018K147C]
- Nanjing University
- 1000 Youth Talent Program - Chinese central government
Converting poultry litter (PL) into biochar by slow pyrolysis is a promising approach for recycling organic waste with enhanced phosphorus (P) utilization efficiency, which needs fundamental knowledge of in situ P speciation transformation for optimizing the biochar conversion conditions. In this study, solid-state NMR spectroscopy was employed to characterize solid-state P and C speciation of raw PL and PL-derived biochars prepared at various pyrolysis temperatures. The NMR analysis indicated that phytates were decomposed while hydroxyapatite (Ca-10(PO4)(6) (OH)(2)) formed during conversion of PL to PL-derived biochar at a pyrolysis temperature above 300 degrees C. With increasing pyrolysis temperature to above 500 degrees C, farringtonite (Mg-3(PO4)(2)) formed. The higher pyrolysis temperature also favored the formation of calcite and provided deeper carbonization (i.e., greater dominance of thermally stable aromatic structures) in the biochar products. Water extractable P decreased significantly from 2.9 g/kg in PL to less than 0.3 g/kg in the PL-derived biochars prepared above 300 degrees C, indicating the inhibition effect of pyrolysis on the P lability mainly through transformation of labile phosphates in PL into less soluble forms. Overall, this study suggested that different pyrolysis temperatures should be considered for selective conversion of PL to biochar products with distinct agricultural and environmental applications that demand special P release patterns.
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