Comparison between Soil- and Biochar-Derived Humic Acids: Composition, Conformation, and Phenanthrene Sorption
Comparison between Soil- and Biochar-Derived Humic Acids: Composition, Conformation, and Phenanthrene Sorption
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土壤和生物炭衍生的腐植酸的比较：组成、构象和菲吸附
DOI：
10.1021/acs.est.7b04999
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发表时间：
2018-02-20
影响因子：
11.4
通讯作者：
Xing, Baoshan
中科院分区：
文献类型：
--
作者：
Jin, Jie;Sun, Ke;Xing, Baoshan
生物炭衍生有机物（BDOM）在决定生物炭在土壤修复中的应用潜力方面发挥着重要作用。然而，人们对 BDOM 的物理化学性质及其对疏水性有机化合物 (HOC) 的吸附知之甚少。在 450 摄氏度下从植物秸秆和动物粪便产生的氧化生物炭中提取腐殖酸（HA），并研究了它们对 HOC 代表菲的吸附。生物炭衍生的 HA (BDHA) 的有机碳回收率为 13.9-69.3%。 BDHAs的C-13 NMR谱主要由芳香族和羧基C组成，而土壤来源的HAs（SDHAs）的C-13 NMR谱在脂肪族区域包含丰富的信号。 BDHA 和 SDHA 具有相当的 CO2 累积表面积。研究发现 BDHA 比 SDHA 具有更高的菲吸附能力。去除无定形芳香族成分后，BDHA 的逻辑值显着降低，这表明无定形芳香族 C 调节 BDHA 对菲的吸附。相反，脂肪族部分在 SDHA 的菲吸附中占主导地位，去除无定形芳烃后吸附增强就证明了这一点。这项研究清楚地证明了 BDHA 和 SDHA 的对比特征和吸附行为，表明生物炭的添加和随后的风化可以极大地影响天然有机质特性和生物炭改良土壤中 HOC 的命运。
Biochar-derived organic matter (BDOM) plays an important role in determining biochar's application potential in soil remediation. However, little is known about the physicochemical properties of BDOM and its sorption of hydrophobic organic compounds (HOCs). Humic acids (HAs) were extracted from oxidized biochars produced from plant straws and animal manures at 450 degrees C, and their sorption of phenanthrene, a representative of HOCs, was investigated. The organic carbon recovery of biochar-derived HAs (BDHAs) was 13.9-69.3%. The C-13 NMR spectra of BDHAs mainly consisted of aromatic and carboxylic C, while those of soil-derived HAs (SDHAs) contained abundant signals in aliphatic region. BDHAs and SDHAs had comparable CO2 cumulative surface areas. BDHAs were found to exhibit higher phenanthrene sorption than SDHAs. After the removal of amorphous aromatic components, the logic, values of BDHAs were significantly decreased, implying that amorphous aromatic C regulated phenanthrene sorption by BDHAs. In contrast, aliphatic moieties dominated phenanthrene sorption by SDHAs, as evidenced by the enhanced sorption after the removal of amorphous aromatics. This study clearly demonstrated the contrasting characteristics and sorption behaviors of BDHA and SDHA, indicating that biochar addition and subsequent weathering could greatly affect native organic matter properties and the fate of HOCs in biochar-amended soils.