1. School of Environment and Energy, South China University of Technology, Guangzhou, Guangdong 510006, P. R. China
2. College of Chemistry and Bioengineering, Guilin University of Technology, Guilin, Guangxi, 541004, P. R. China
3. College of Chemistry, Guangdong University of Petrochemical Technology, Maoming, Guangdong 525000, P. R. China