1. College of Chemistry & Chemical Engineering Central South University Changsha 410083 Hunan P. R. China
2. Shaanxi Electric Power Research Institute State Grid Corporation of China Xi'an 710054 Shanxi P. R. China
3. Catalysis Center Physical Sciences and Engineering Division King Abdullah University of Science and Technology Thuwal 23955-6900 Saudi Arabia
4. Key Laboratory of Hunan Province for Water Environment and Agriculture Product Safety Central South University Changsha 410083 Hunan P. R. China