1. College of Electronic and Electrical Engineering, Key Laboratory of Optoelectronic Sensing Integrated Application of Henan Province, Henan Normal University, Xinxiang, Henan 453007, P. R. China
2. School of Environment, Key Laboratory for Yellow River and Huai River Water Environmental and Pollution Control, Ministry of Education, Henan Key Laboratory for Environmental Pollution Control, Henan Normal University, Xinxiang, Henan 453007, P. R. China