First of all, I would like to express my sincere thanks and appreciation to the Custodian of the Two Holy Mosques King Salman bin Abdulaziz, and the Crown Prince, (His Royal Highness) Prince Muhammad bin Salman, may ALLAH preserve and protect them, to give me the citizenship of this holy country. I am working as a Full Professor at the Department of Chemistry, College of Science, King Saud University, Saudi Arabia. I received (B.S/M.S/Ph.D) degrees from Aligarh Muslim University, Aligarh, India. My research interest mainly focuses on wastewater treatment. I am the author/co-author of over 450 refereed journal publications, seven US patents, 25 book chapters and 25 books published by Springer, Nova, CRC and Elsevier. My work is widely recognized and has more than 26000 citations with H-index of 86 according to Google Scholar Citations. I have been included in the list of HIGHLY CITED RESEARCHER 2019, 2020 & 2021 which is one of the best achievements for an academician. Recently, the scientists at Stanford University have created a database of around 1,00,000 top scientists of the world and I have been ranked 109th position (Chemical Engineering section) at the Global level. I have successfully completed several research projects funded by National plan for Science and Technology (NPST) and King Abdulaziz City for Science and Technology (KACST), Kingdom of Saudi Arabia. I am the editor/editorial member of several reputed Journals like Scientific Report (Nature); Surfaces & Interfaces (Elsevier), Current Pollution Reports (Springer) and Polymers (MDPI). I have also served as an associate editor in the Environmental Chemistry Letters (Springer). I am associate editor of J. Water Process Eng. (Elsevier) & managing editor of Nanotechnology for Environmental Engineering Journal (Springer). I have edited several Special issues for Chemosphere (Elsevier), Ecotoxicology and Environmental Safety (Elsevier); IJERPH (MDPI) and sustainability (MDPI). I am the recipient of several prestigious awards, including the Scientist of the year award-2015, NESA, Delhi, India; Almarai Award-2017, Saudi Arabia and Best Research quality award-2019 (Ist position), King Saud University. I am also a Fellow of Royal Society of Chemistry (FRSC).