1. Graduate School of EEWS (Energy, Environment, Water and Sustainability), Korea Advanced Institute of Science and Technology (KAIST), 291 Daehak-ro, Yuseong-gu, Daejeon 34141, Republic of Korea
2. Nanotechnolgy and Water Sustainability Research Unit, College of Science, Engineering and Technology, University of South Africa (UNISA), UNISA Science Campus, 1709 Johannesburg, Republic of South Africa
3. Division of Chemistry and Chemical Engineering California Institute of Technology, 1200 East California Boulevard, Pasadena, California 91125, United States