Sahmik Chowdhury is Assistant Professor in the School of Environmental Science and Engineering, Indian Institute of Technology Kharagpur, West Bengal, India. His research interests are in the design and development of advanced functional materials, with an emphasis on two-dimensional (2D) materials, for sustainable energy applications and climate change mitigation. Dr. Mu. Naushad is working as a full professor in the Department of Chemistry, College of Science at King Saud University, Riyadh, Saudi Arabia. His research interests include wastewater treatment, adsorption, ion exchange, bioremediation, and photodegradation. Dr. Naushad is the author and coauthor of more than 500 refereed journal publications and several books, book chapters, and US patents.