1. Department of Chemical Science & Engineering, School of Engineering, Kathmandu University, P.O. Box. 6250, Dhulikel 45200, Kavre, Nepal
2. Department of Chemical Engineering, Kongju National University, Chungnam 31080, Korea
3. Department of Physics, School of Science, Kathmandu University, Dhulikel 45200, Kavre, Nepal
4. Key Laboratory of New Processing Technology for Nonferrous Metals and Materials, Ministry of Education, School of Resources, Environment and Materials, Guangxi University, Nanning 530004, China