离子液体[BMIM][BF_(4)]浸泡时间对煤微观活性结构的影响  

Effects of immersion time of ionic liquid[BMIM][BF_(4)] on micro-active structure of coal

作　　者：肖旸 徐凡[1] 张浩 刘昆华 XIAO Yang;XU Fan;ZHANG Hao;LIU Kunhua(College of Safety Science and Engineering,Xi’an University of Science and Technology,Xi’an 710054,China;Shaanxi Key Laboratory of Prevention and Control of Coal Fire,Xi’an University of Science and Technology,Xi’an 710054,China)

机构地区：[1]西安科技大学安全科学与工程学院,陕西西安710054 [2]西安科技大学陕西省煤火灾害防治重点实验室,陕西西安710054

出　　处：《西安科技大学学报》2021年第3期394-401,共8页Journal of Xi’an University of Science and Technology

基　　金：国家重点研发资助项目(2018YFC0807900);国家自然科学基金项目(51974233)。

摘　　要：为探究经离子液体浸泡后煤样表面微观结构的变化,用离子液体[BMIM][BF 4]将长焰煤煤样浸泡2,30,90和180 d,分别采用Quanta 450场发射扫描电子显微镜,X射线衍射仪和傅里叶变换红外光谱仪对煤样的外部形貌、微晶结构以及官能团变化进行了分析。实验发现:随着离子液体浸泡时间的增加煤的外部形貌变的更粗糙,对煤表面结构破坏程度更大;经离子液体浸泡煤样的脂肪烃和含氧官能团的峰面积比原煤样小。其中,浸泡180 d的煤样煤化度最高,煤分子表面缩合度更高,结构更紧密,煤微晶结构中脂肪族侧链溶解最多,煤表面分子结构中的含氧官能团变化最明显。离子液体[BMIM][BF 4]对煤样表面微观结构的破坏随着浸泡时间的增加越来越大,煤化度越来越高,[BMIM][BF 4]浸泡180 d对煤样表面微观结构影响最大。To explore the optimal time for inhibiting effects on coal surface microstructure treated by ionic liquid,the samples of long flame coal were soaked by using ionic liquid[BMIM][BF 4]for a duration of 2,30,90,and 180 d.Quanta 450 field emission scanning electron microscope,X ray diffraction,and Fourier transforms infrared spectroscopy were employed to examine external appearance,microcrystal structure,and functional groups.Experimental tests show that:The external morphology of coal becomes rough with the increase of soaked time,and the coal soaked by ionic liquid will damage the coal surface more greatly;aliphatic hydrocarbons and oxygen containing functional groups peak areas of those soaked by ionic liquid are well dwarfed to raw coal.Among them,those soaked by ionic liquid for 180 d have a higher degree in the coalification,a higher degree in the molecular surface condensation of coal,and the structure is tighter,the more aliphatic side chains dissolve in the microcrystalline structure of coal,the oxygen functional groups of coal samples surface change most obviously.The destruction of coal molecules by ionic liquid[BMIM][BF 4]increases with the increasing soaked time,and coalification degree is getting ever higher,which shows that[BMIM][BF 4]immersion for 180 d has the best inhibitory effect on coal surface microstructure.

关 键 词：离子液体 微晶结构 官能团 煤化度 浸泡时间 

分 类 号：TD752[矿业工程—矿井通风与安全]