1. School of Chemistry and Chemical Engineering, Southwest Petroleum University, Chengdu 610500, P. R. China
2. Oil & Gas Field Applied Chemistry Key Laboratory of Sichuan Province, Chengdu 610500, P. R. China
3. State Key Laboratory of Pollution Control and Resource Reuse, Jiangsu Key Laboratory of Vehicle Emissions Control, School of the Environment, Nanjing University, Nanjing 210023, P. R. China