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Structure and Characteristic Analysis of Humic Acids Extracted from Two Typical Lignites with Different Extractants

机译：两种典型褐煤用不同萃取剂提取腐植酸的结构及特性分析

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摘要

Properties of humic acids (HAs) depend on source of origin as well as method of extraction, and the physicochemical properties of HAs are directly affected by their structure, so it is of great significance to study HAs extracted with different extractants. HAs isolated from two lignite samples with three extractants (KOH, NaOH, Na_4P_2O_7) respectively were characterized using spectral methods and ultimate analysis and compared with each other. Comparison of the HAs extracted from two lignites with different extractants shows that they are very similar to each other in chemical nature regarding the at least degree of aromaticity and humification, molecular weight, and the distribution of function groups. The experimental results indicate that the extraction of HAs from lignite with higher humification degree is less affected by the type of extractant. Additionally, the six HAs are rich in oxygen-containing groups, and both the aliphatic and aromatic carbons are main existing forms of carbon in HAs. The results of XRD patterns indicate that the content of aliphatic carbon is higher than the aromatic carbon in the six HAs. In this work, the capacity of lignites as parent sources of HAs for various applications is appreciated mainly on the base of extractability and content of oxygen-containing groups. In addition to high extraction efficiency, the extractant with little influence on HAs structure should be selected. So studies on the physicochemical properties of HAs can be helpful in predicting the behavior characteristics of HAs in practical application, and provide valuable reference for the future application of HAs.
机译：腐植酸的性质取决于来源和提取方法，而HAs的理化性质直接受其结构的影响，因此研究用不同萃取剂提取的HA具有重要意义。采用光谱法和最终分析方法，分别对2个褐煤样品中含有3种萃取剂（KOH、NaOH、Na_4P_2O_7）分离的HA进行表征，并相互比较。从两种褐煤中提取的HAs与不同萃取剂的比较表明，它们在化学性质上非常相似，至少在芳香性和腐殖化程度、分子量和官能团分布方面。实验结果表明，腐殖化程度较高的褐煤中HAs的提取受萃取剂种类的影响较小。此外，6种HAs富含含氧基团，脂肪族碳和芳香族碳都是HAs中现存的主要碳形式。XRD图谱结果表明，6种HAs中脂肪族碳含量高于芳香族碳。在这项工作中，褐煤作为HA母源在各种应用中的能力主要基于可萃取性和含氧基团的含量。除提取效率高外，还应选择对HAs结构影响较小的提取剂。因此，研究HAs的理化性质有助于预测HAs在实际应用中的行为特征，并为HAs的未来应用提供有价值的参考。

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