Prof. RENGARAJ SELVARAJ., Ph.D., FRSC, is a Professor of Chemistry in the Sultan Qaboos University, Muscat, Oman with responsibility for teaching, research and consultancy in the field of Nanotechnology, Analytical and Applied Environmental Chemistry. Prof. Rengaraj graduated from Anna University, Madras, India with a Ph.D in Chemistry during 1999. He has 30 years of research experience in Materials, Environmental Science and Engineering, particularly in the area of Photocatalysis, Environmental Nanotechnology, wastewater treatment, water quality analysis, and solid waste management. He has published more than 100 research articles in reputed National, International Journals, and Proceedings (h-index 35) and has been serving as an editorial board member of some International Journals. He has participated and presented his research papers in several National and International conferences. Prof. Rengaraj is having more than 25 years post Ph.D experience as Marie Curie Experienced Research Fellow, Visiting Professor, Brain Pool Scientist, Post-Doctoral Fellow, Contract Professor, and Visiting Scientist at different International Universities, United Nation University pilot program and Research Institutes at Finland, France, Oman, South Africa, South Korea and Hong Kong. Prof. Rengaraj has been elected as one of the board of directors for Pacific Basin Consortium for Environment and Health. At present, his research group is actively involving in the area of synthesis, characterization and application of nano-structured photocatalysts for water splitting reactions, separation of oil and water, removal of EDCs, toxic organics, VOCs, pharmaceuticals, NOx and heavy metals from water and wastewater. In addition, he is member of American Chemical Society, Fellow of Royal Society of Chemistry (FRSC), Life Member of Indian Council of Chemists (ICC) and several International Scientific committee. Recently his name has been ranked top 2% of the best researcher around the world by Stanford University, USA (Published in the Year 2020 and 2021). Recently University of South Africa, Johannesburg appointed Prof. Rengaraj as Professor Extraordinarius as honorary position. Prof. Rengaraj has received Eminent Scientist Award from Indian Council of Chemists in the year 2023 and also Received Analytical Scientist Award from Indian Society of Analytical Scientists (ISAS) in the year 2024.