Aspects of structural features in lignite and lignite humic acids
Aspects of structural features in lignite and lignite humic acids
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DOI：
10.1016/j.fuproc.2006.05.003
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发表时间：
2006-09-01
影响因子：
7.5
通讯作者：
Pihlaja, K.
中科院分区：
文献类型：
--
作者：
Peuravuori, J.;Zbankova, P.;Pihlaja, K.
采用紫外-可见光谱、核磁共振氢谱、固体核磁共振碳谱、红外光谱和元素分析等方法研究了南摩拉维亚褐煤及其腐殖酸组分的结构特征。原始褐煤和HA型馏分之间的结构差异相对较小，只有通过统计方法才有可能将其明确区分为不同的类别。测试的模型函数强烈的重要性，选择足够的敏感和有意义的结构参数，最有可能反映的字符或类型级别的煤样碳的问题。结果表明，在褐煤HA材料复杂的结构网络中，某些脂肪族化合物有其特殊的作用，需要强非质子性溶剂才能获得完全溶解的HA溶液。尽管在不同的有效洗涤纯化操作过程中损失了一些有机材料，但纯化的褐煤HA是典型的，而没有显著损失原始HA级分的结构信息。FT-IR实验与C-13 NMR实验结果具有很好的相关性。从环境的角度来看，从原始褐煤材料中释放的一些水溶性有机痕量组分可能是存款周围地区的潜在麻烦制造者。(C)2006 Elsevier B. V.保留所有权利。
Structural features of a South Moravian lignite and its humic acid (HA) fraction were studied by means of UV-vis, H-1 and solid-state C-13 NMR, and FT-IR spectroscopy in addition to basic elemental analyses. The structural differences between the original lignite and its HA-type fraction were relatively minor, and their unambiguous differentiation into distinct categories was possible only by statistical methods. The tested model functions speak strongly for the importance of choosing enough sensitive and meaningful structural parameters which most likely reflect the character or type-rank of the coal-like carbon in question. The results verified that certain aliphatic compounds have their special tasks in the complicated structural network of lignite HA material, and powerful aprotic solvents are needed to obtain a fully dissolved HA solution. Despite some organic material was lost during different effective washing purification operations, the purified lignite HA was typified without significant loss of structural information on the original HA fraction. FT-IR experiments correlated well with those obtained by C-13 NMR. From environmental points' of view, some water soluble organic trace components released from the original lignite material may be potential troublemakers within the area surrounding the deposit. (C) 2006 Elsevier B.V. All rights reserved.