State Key Laboratory of Coal Resources and Safe Mining, China University of Mining and Technology, Xuzhou, 221116, China.
School of Mines, China University of Mining and Technology, Xuzhou, 221116, China.
Environ Sci Pollut Res Int. 2022 Jun;29(30):46325-46340. doi: 10.1007/s11356-022-19191-1. Epub 2022 Feb 15.
The water wettability of coal dust was very important for dust control when using water-based dust suppressant materials. The coal dust wettability strengthened by surface active ionic liquid was studied in this paper. The surface activity of ten ionic liquids with different anions Cl, Br, [BF], [NTf] and cations [HOEtMIm], [Cmim] (n = 4, 12, 14, 16) was studied by surface tension test. The water wettability of raw coal dust can be improved individually by adding ionic liquid to water or pre-treating coal dust by ionic liquids. The wettability of lignite was improved little, but that of bituminous coal and anthracite were improved much. The dual strengthened effects of ionic liquids on coal dust wettability were studied by the wetting results between ionic liquids solutions and ionic liquid-treated coal samples. The wettability of lignite can be strengthened under the combined action of [HOEtMIm][NTf] and [CMIm]Br, while other dual effects were not satisfactory. All ionic liquids combination had strengthened effects on the wettability of bituminous coal and anthracite, especially the [CMIm]Br treatment and [CMIm]Br solutions together had the best dual effects. The functional groups results indicated that the hydrophilic oxygen-containing functional groups in treated coal samples increased, the hydrophobic aliphatic hydrocarbon functional groups decreased and part of ionic liquids were adsorbed on the coal surface. These changes together enhanced the wettability of coal with high coalification degrees.
粉尘湿润性对水基抑尘剂材料的防尘控制非常重要。本文研究了表面活性离子液体增强的煤粉湿润性。通过表面张力测试研究了十种具有不同阴离子 Cl、Br、[BF]、[NTf]和阳离子[HOEtMIm]、[Cmim]（n=4、12、14、16）的离子液体的表面活性。将离子液体添加到水中或用离子液体预处理煤粉可以单独提高原煤的湿润性。褐煤的湿润性改善较小，但烟煤和无烟煤的湿润性改善较大。通过离子液体溶液与离子液体处理的煤粉样品之间的润湿结果研究了离子液体对煤粉湿润性的双重增强作用。[HOEtMIm][NTf]和[CMIm]Br 的联合作用可以增强褐煤的湿润性，而其他双重作用则不尽人意。所有离子液体组合都对烟煤和无烟煤的湿润性具有增强作用，特别是[CMIm]Br 处理和[CMIm]Br 溶液的联合作用具有最佳的双重效果。官能团结果表明，处理后的煤粉样品中增加了亲水性含氧官能团，减少了疏水性脂肪族烃官能团，部分离子液体被吸附在煤表面。这些变化共同增强了高变质程度煤的湿润性。
