The eco-friendly and sustainable technique was developed to resolve the problem of heavy metal pollution. In the present study, the removal of cobalt (Co (II)) was carried out using the activated carbon (AC). Activated carbon compound was prepared using selected plants such as Ficus benghalensis (FB), Mangifera indica (MI), Tamarindus indica (TI), Azadirachta indica (AI) and Syzygium cumini (SC). The characterization of the products was done by using the scanning electronic microscope (SEM) in order to know the microstructure of AC. It shows that prepared activated carbons (PACs) are porous in nature having the elevated surface area for effective adsorption and applicable for the mitigation of heavy metals. The study involves the effect of dose, concentration and contact time for removal of Co (II) and to assess the efficiency of PACs. The results reveal that the adsorption of Co (II) observed to be highest at 5g PAC-AI, PAC-MI and 6g for PAC-TI, PAC-FB, PAC-SC dose, respectively. Maximum adsorption was exhibited in a solution containing 25 mg/L concentration of Co (II) after addition of a mixed dose of PACs. The comparable adsorption was observed at contact time for PAC-AI, PAC-TI, PAC-FB, PAC-SC at 120 minutes and PAC-MI for 30 minutes respectively. Moreover, it is a need for continuous monitoring and further research for the development of an eco-friendly and advanced method to remove heavy metals.