1. Key Laboratory of Coal Mine Safety and Efficient Exploitation of Ministry of Education, School of Energy Resources and Safety; Anhui University of Science and Technology; Huainan 232001 China
2. ETS de Ingenieros de Caminos; Universidad Politécnica de Madrid; Madrid 28040 Spain
3. Department of Chemistry, College of Science; Zhejiang Sci-Tech University; Hangzhou 310018 China