ISSN: 2410-9649 Abid et al / Chemistry International 9(1) (2023) 1-7 iscientic.org. 1 http://bosaljournals.com/chemint editorci@bosaljournals.com Article type: Research article Article history: Received October 2022 Accepted November 2022 January 2023 Issue Keywords: Copper ion Biosorbent Carissa opaca AAS Adsorption isotherms Waste material of different types coming from industries seriously affects the environment and contaminates water, soil, and air. The heavy metals effluents from industries constitute one of the most hazardous type of pollutants and the removal of these metals from the ecosystem is highly desirable to ensure the sustainability of environment. In the present study, residual biomass produced from roots of Carissa opaca upon extraction of bioactive compounds was used as a biosorbent to eliminate copper (Cu 2+ ) ions from wastewater. The effect of different parameters such as contact time, pH, and initial concentration has been studied and maximum adsorption was observed for 10 ppm copper ions at contact time 120 minutes and pH 5. Adsorption isotherm studies reveal the good fitting of Langmuir adsorption isotherms than others and the adsorption efficiency of bio sorbent follows the pseudo-second order kinetic model. Conclusively Carissa opaca proved as a good biosorbent for the removal of copper ions from the contaminated water. © 2023 International Scientific Organization: All rights reserved. Capsule Summary: The Carissa opaca roots was used as an adsorbent for the removal of copper ions and at optimum conditions of process variable, C. opaca roots biomass showed promising adsorption efficiency, which could be employed for the remediation of copper ions from the effluents. Cite This Article As: H. Abid, A. Amanat, D. Ahmed and T. Qamar. Adsorption efficacy of Carissa opaca roots residual biomass for the removal of copper from contaminated water. Chemistry International 9(1) (2023) 1-7. https://doi.org/10.5281/zenodo.7317579 INTRODUCTION Water pollution is among the major environmental issues that humanity faces today, and its ascending trend is mainly due to the industrial effluents containing toxic and hazardous contaminants such as heavy metals, dyes, phenols, and pesticides (Aslam et al., 2018; Qamar et al., 2015; Sun et al., 2019). The continuous releases of these pollutants not only contaminate the surface water but also disturb the ground water through seepage. Removal of the heavy metals from soil and water is imperative due their widespread occurrence in the environment, non-degradability, and highly toxic impacts on living beings (Sakhi et al., 2018; Ruthiraan et al., 2019). Heavy metals are the metals having specific weight usually rages from 63 to 200 g/mol with high specific gravity and their density lies between 3.5 and 7 g cm −3 (Shanab et al., 2012). Among heavy metals, copper has received considerable attention because of its toxicity, incremental accumulation in the food chain, persistence in the ecosystem, its wide spread existence and its possible introduction into Chemistry International 9(1) (2023) 1-7 Adsorption efficacy of Carissa opaca roots residual biomass for the removal of copper from contaminated water Hina Abid, Alia Amanat, Dildar Ahmed and Tariq Qamar* Department of Chemistry, Faculty of Natural Sciences, Forman Christian College (A Chartered University), Ferozepur Road Lahore 54600, Pakistan *Corresponding author’s E. mail: tariqqamar@fccollege.edu.pk ARTICLE INFO ABSTRACT