国家自然科学基金41474014,41674032,41274048;湖南科技大学煤炭资源清洁利用与矿山环境保护湖南省重点实验室开放研究基金E21502.The National Natural Science Foundation of China,Nos.41474014,41674032,41274048;the Open Research Fund Program of Hunan Province Key Laboratory of Coal Resources Clean-utilization and Mine Environment Protection,No.E21502