Water bodies have systematically suffered from pollution caused by urban and industrial activities. Heavy metals are in a category of contaminants of lakes, rivers and seas that are of great concern. The development of environmentally correct alternatives is necessary to neutralize the action of heavy metals. It is worth noting that numerous solutions have already been adopted in order to remove heavy metals from seas and lakes. However, the production of some products to remove contaminants causes environmental pollution. Therefore, it is extremely important to develop an environmentally friendly synthesis route, so that the production process is consistent with the purpose of the final product. The objective of this work is the development of an environmentally friendly route for the synthesis of bifunctional zero valency iron using agro-industry residues with low added value. They have a metallic phase (zero valency iron) to degrade the harmful metals and an organic phase (grape peel biomass) suitable for adsorption pollutants. The particles were produced by a green route using Mentha spicata extract as an iron-reducing agente of Fe³⁺. The results indicated the presence of ferrous material in the samples. Furthermore, the functionality of the composite was analyzed by spectrophotometry, with a reduction of up to 53% of heavy metal ions (Cr^{6 +}) in contaminated water. Therefore, the biocomposite is functional and has the ability to remove heavy metals.