Yang Lingling, Yuan Yuan
Department of Biotechnology, Hefei Technology College, Hefei, 238000, China.
School of Economics and Management, Huainan Normal University, Huainan, 232001, China.
Sci Rep. 2025 May 28;15(1):18676. doi: 10.1038/s41598-025-03769-z.
This study investigates the impact of a novel compound biomass surfactant on the molecular structure and functional group characteristics of Huainan Liuzhuang coal via Fourier Transform Infrared (FTIR) spectroscopy. The experimental results reveal marked differences between raw, distilled water-treated, and surfactant-modified samples, particularly in the transformation of hydroxyl, aliphatic, and oxygen-containing functional groups: (1) The coal's IR spectra are categorized into four key absorption bands, representing hydroxyl groups, aliphatic hydrocarbons, oxygen-containing functional groups, and aromatic hydrocarbons. (2) Surfactant treatment reduces the total hydroxyl group content but increases hydroxyl-hydrogen bonding, enhancing coal's structural stability. (3) The aliphatic side chains in modified coal become shorter, with the 3:7 compound ratio yielding the highest aliphatic group content. (4) C-O-C stretching vibrations condense into aryl ethers, increasing aromatic ring condensation, particularly at the 3:7 ratio. (5) Aromatic hydrocarbon diversity decreases as side chains detach from benzene rings, with ortho-trisubstituted structures (3 H) becoming more prominent. The outcomes demonstrate that compound biomass surfactant treatment induces significant functional group restructuring in coal, notably enhancing its wettability and gas desorption capacity, and providing promising avenues for application in coalbed methane recovery and spontaneous combustion prevention.
本研究通过傅里叶变换红外光谱（FTIR）研究了一种新型复合生物质表面活性剂对淮南刘庄煤分子结构和官能团特性的影响。实验结果表明，原煤、蒸馏水处理煤和表面活性剂改性煤样品之间存在显著差异，尤其是在羟基、脂肪族和含氧官能团的转变方面：（1）煤的红外光谱分为四个关键吸收带，分别代表羟基、脂肪烃、含氧官能团和芳烃。（2）表面活性剂处理降低了总羟基含量，但增加了羟基氢键，增强了煤的结构稳定性。（3）改性煤中的脂肪族侧链变短，3:7的复合比例产生最高的脂肪族基团含量。（4）C-O-C伸缩振动浓缩为芳基醚，增加了芳环缩合，尤其是在3:7的比例下。（5）随着侧链从苯环上脱离，芳烃多样性降低，邻位三取代结构（3H）变得更加突出。结果表明，复合生物质表面活性剂处理可使煤中的官能团发生显著重组，显著提高其润湿性和气解吸能力，并为煤层气回收和自燃预防提供了有前景的应用途径。
