Mohamed A. Barakat is Professor of Environmental Sciences at King Abdulaziz University, Saudi Arabia. He is highly qualified in the fields of Industrial Waste Management and Pollution Control, as well as Catalysis and Nanotechnology. Experience includes academic research works in Japan, Germany, the United States, and Saudi Arabia, as well as initiating and leading industrial research projects in Egypt, and jointly with the United States. He has published 135 papers in ISI journals, 2 patents, 8 book chapters, and 55 presentations in international conferences. His citation is about 7500 with H- index of 40. He was awarded many awards such as; KSA- ISESCO Environmental Management award-2019, Jeddah Prize of Creatives, Jeddah, Saudi Arabia (2018), Annual Publications awards, KAU University, Saudi Arabia (2011-2018), Award of Environmental Research, Academy of Scientific Research and Technology, Egypt (2003-2013), and King Hassan II Prize for Environment, Morocco (2008). He supervised more than 20 M.Sc. and Ph.D. theses, and established a new Laboratory for Advanced Technologies for Wastes Treatment in the Department of Environmental Sciences, KAU. Rajeev Kumar received M. Phil (2008) and Ph.D. degree in Applied Chemistry (2011) from Aligarh Muslim University, India. He is currently working as Associate Professor at the Environmental Science Department, King Abdulaziz University, Jeddah, Saudi Arabia. His research activities are in the areas of wastewater treatment and materials science. Rajeev studies the adsorption and photocatalytic properties of nanomaterials for the removal of contaminants from wastewater. He has completed 14 research projects and published 84 research articles and 5 book chapters with total citations about 2600 and H index 27. He is actively involved in the M.Sc. and Ph.D. thesis supervision. He was received the Kingdom of Saudi Arabia Award for Environmental Management in the Islamic World, Second Prize, Best researcher, Edition 2018-2019.