This study investigates the effectiveness of activated bentonite as an adsorbent for removing copper sulfate from aqueous solutions, finding that unheated bentonite can eliminate up to 62% of copper ions, while thermally treated bentonite achieves nearly 90% removal efficiency at optimal conditions. The study highlights the increasing concern over copper contamination in water sources due to human activities and the inefficiencies of traditional removal methods. UV-vis spectrophotometry was utilized to measure the adsorption capabilities and efficiency of bentonite in various conditions.