Wang Shiju, Zheng Yuannan, Jiang Bingyou, Yu Chang-Fei, Zhang Yi, Tao Wenhan, Ji Ben
Joint National-Local Engineering Research Centre for Safe and Precise Coal Mining, Anhui University of Science and Technology, Huainan, Anhui 232001, China.
Key Laboratory of Industrial Dust Prevention and Control & Occupational Health and Safety, Ministry of Education, Anhui University of Science and Technology, Huainan, Anhui 232001, China.
Langmuir. 2023 Oct 3;39(39):14173-14188. doi: 10.1021/acs.langmuir.3c02308. Epub 2023 Sep 21.
Green biosurfactants are emerging as a promising area of research. However, there is a limited focus on the adsorption and wetting characteristics of biosurfactants on coal dust. This study explores the effects of sophorolipid (SL) biosurfactants on the microstructure and wettability of different coalification degree coal. The microstructure parameters of SL adsorbed on coal dust were measured using a surface tensiometer, contact angle analyzer, and particle size analyzer. The results indicate that SL has the lowest critical surface tension, leading to a 9.25° decrease in the contact angle for low-rank bituminous coal (YZ-LRBC). Furthermore, SL significantly altered the particle size distribution of lignite (NM-LC) and YZ-LRBC. The pore size structure of SL-infiltrated coal dust was quantified using a specific surface area analyzer, revealing a decrease in the specific surface area and an increase in the average pore size. The infrared analysis demonstrated that SL permeation significantly increased the percentage of hydrophilic functional groups (hydroxyl structures) while reducing the hydrophobic functional groups (aliphatic hydrocarbon and aromatic structure). Based on the measured microstructure parameters, a regression equation for contact angle was established: [contact angle (°)] = 73.800 - 0.860 × [D10 (nm)] + 4.280 × [specific surface area (m/g)]. Notably, the characteristic particle size D10 had a significant negative effect on the contact angle, while the specific surface area had a significant positive effect. These findings provide a theoretical foundation for the application of biosurfactants in water injection to reduce dust and improve the wetting efficiency.
绿色生物表面活性剂正成为一个有前景的研究领域。然而，对于生物表面活性剂在煤尘上的吸附和润湿性的关注有限。本研究探讨了槐糖脂（SL）生物表面活性剂对不同煤化程度煤的微观结构和润湿性的影响。使用表面张力仪、接触角分析仪和粒度分析仪测量了吸附在煤尘上的SL的微观结构参数。结果表明，SL具有最低的临界表面张力，导致低阶烟煤（YZ-LRBC）的接触角降低了9.25°。此外，SL显著改变了褐煤（NM-LC）和YZ-LRBC的粒度分布。使用比表面积分析仪对渗透了SL的煤尘的孔径结构进行了量化，结果显示比表面积减小，平均孔径增大。红外分析表明，SL渗透显著增加了亲水性官能团（羟基结构）的百分比，同时减少了疏水性官能团（脂肪烃和芳香结构）。基于测量的微观结构参数，建立了接触角的回归方程：[接触角（°）]=73.800 - 0.860×[D10（nm）]+4.280×[比表面积（m/g）]。值得注意的是，特征粒径D10对接触角有显著的负面影响，而比表面积有显著的正面影响。这些发现为生物表面活性剂在注水降尘和提高润湿效率方面的应用提供了理论基础。
