Financial support from the National Natural Science Foundation of China (No. 21202049), the Recruitment Program of Global Experts (1000 Talents Plan), the Natural Science Foundation of Fujian Province (No. 2016J01064), Fujian Hundred Talents Plan and Program of Innovative Research Team of Huaqiao University (No. Z14X0047) are gratefully acknowledged. We also thank Instrumental Analysis Center of Huaqiao University for analysis support.