1. School of Environmental Science and Engineering/Key Laboratory of Efficient Utilization of Low and Medium Grade Energy (MoE)/Tianjin Key Lab of Biomass-wastes Utilization, Tianjin University, Tianjin 300072, China
2. Earth Engineering Center, Columbia University, New York, New York 10027, United States
3. College of Management and Economics, Tianjin University, Tianjin 300072, China
4. School of Science, Tibet University, Lhasa 850012, China