1. School of Chemistry and Chemical EngineeringYan'an University Yan'an 716000 PR China
2. Shaanxi Key Laboratory of Chemical Reaction Engineering Yan'an City 716000 PR China
3. School of New Energy and Environmental EngineeringJiangxi University of Engineering Xinyu City 330046 PR China
4. School of Chemistry and Chemical EngineeringYan'an University Yan'an City 716000 PR China
5. Department of Applied ScienceFeroze Gandhi Institute of Engineering and Technology Raebareli 229001 (U.P.) India
6. Department of PhysicsGovt. Motilal Vigyan Mahavidyalya College Bhopal 462008 Madhya Pradesh State India