In this study, a Fe–Cu composite was synthesized using the co-precipitation method, and various characterization studies such as SEM, XRD and PZC were investigated. It showed that Fe–Cu composite adsorbent showed a cluster-like structure, agglomerated, formed with higher PZC (PZC: 7.8). A batch experimental investigation was performed to inspect the removal efficacy of As (V) from aquatic systems by Fe–Cu composite, emphasizing the impact of variables such as solution pH, agitation speed, system temperature, and the presence of phosphate ions. The peak performance capacity for adsorption was reported to be 40.17 mg/g and demonstrated multilayer adsorption. Due to the addition of copper in iron, the composite achieves higher PZC value and better multi-layer adsorption capacity. It was witnessed that > 90% removal performance was achieved at equilibrium pH < 7.7, and after equilibrium pH 7.7, desorption started, and removal performance dropped rapidly. In this study, it was observed that solution temperature had a positive effect on As (V) removal performance, but agitation speed had no discernible effect. However, the presence of phosphate ions in the solution significantly restricted As (V) removal efficiency and occupied the activated site of the adsorbent. This study underscores the potential of Fe–Cu composite for As(V) remediation from aqueous solution.