ABSTRACT

This paper reports on the surface properties associated with high-ash Indian Permian coal, which primarily depend on its geochemical compositions. X-ray photoelectron spectroscopy (XPS) and Fourier transform infrared spectroscopy (FTIR) techniques have been used to assess surface properties. The results confirm the presence of different elements, mineral phases, and organic functional groups in coal. The XPS survey confirms the presence of different elements on the surface of the coal. Some of them are C 1s (286.0 eV), O 1s (534.5 eV), N 1s (399.9 eV), S 2p (158.2 eV), such as SiO₂ and Al₂O₃, which correspond to Si 2p (102.7 eV) and Al 2p (75.6 eV) with other clay minerals. XPS spectra of C 1s confirm the presence of aliphatic and aromatic carbon, which are hydrophobic compared to hydrophilic groups such as alcoholic, carboxylic, and phenolic. FTIR also validates the existence of hydrophobic functional groups as being higher than hydrophilic groups. Proximate and ultimate analysis results also confirm the presence of less moisture and a higher carbon percentage in the coal samples. Hence, the inherent hydrophobicity of the coal surface is excellent, and the surface hydrophobicity of coal can also be characterized using XPS and FTIR techniques. This information about the coal properties will be very beneficial for coal beneficiation and utilization.

摘要

本文报告了与高灰分印度二叠纪煤炭相关的表面特性，这主要取决于其地球化学成分。X 射线光电子能谱 (XPS) 和傅里叶变换红外光谱 (FTIR) 技术已用于评估表面特性。结果证实煤中存在不同元素、矿物相和有机官能团。XPS 调查证实煤表面存在不同元素。其中一些是C 1s (286.0 eV)、O 1s (534.5 eV)、N 1s (399.9 eV)、S 2p (158.2 eV)，例如SiO 2_和Al ₂ O ₃，对应于 Si 2p (102.7 eV) 和 Al 2p (75.6 eV) 以及其他粘土矿物。C 1s 的 XPS 光谱证实了脂肪族和芳香族碳的存在，与醇基、羧基和酚基等亲水基团相比，它们是疏水性的。FTIR 还证实疏水性官能团的存在高于亲水性基团。工业分析和最终分析结果也证实了煤样中存在较少的水分和较高的碳百分比。因此，煤表面固有的疏水性非常好，并且煤的表面疏水性也可以利用XPS和FTIR技术来表征。这些有关煤炭性质的信息对于煤炭的选矿和利用将非常有益。