1. School of Safety Science and Engineering, Xi’an University of Science and Technology, Xi’an, Shaanxi 710054, PR China
2. Shaanxi Key Laboratory of Prevention and Control of Coal Fire, Xi’an University of Science and Technology, Xi’an, Shaanxi 710054, PR China
3. School of Chemistry and Environmental Engineering, Sichuan University of Science and Engineering, Zigong, Sichuan 643000, PR China