1. Department of Environmental Science and Engineering, Southern University of Science and Technology, Shenzhen 518055, China
2. Department of Chemistry and Guangdong Provincial Key Laboratory of Catalytic Chemistry, Southern University of Science and Technology, Shenzhen 518055, China
3. Department of Physics, Southern University of Science and Technology, Shenzhen 518055, China
4. Department of Civil and Environmental Engineering, University of California, Berkeley, California 94720, USA