1. a College of Mechanical and Material Engineering, Hubei Key Laboratory of Natural Products Research and Development , China Three Gorges University , Yichang 443002 , China
2. b College of Chemistry and Chemical Engineering, Shaanxi Key Laboratory of Chemical Reaction Engineering, Yan’an University , Yan'an 716000 , China
3. c Department of Chemistry , University of Houstons-Clear Lake , Houston , Texas 77058 , USA