Avanços na reciclagem e gestão de resíduos

Potential Heavy Metal Chemisorptive from Agro-processing Waste and Safe Dumping of Used Adsorbents

Abstract

Daiana Cristóbal

Water pollution is a concern for the environment that has an impact on the ecosystem and living things. One of the finest methods for removing heavy metals is adsorption. Agro-industrial waste is becoming a low-cost alternative to traditional adsorbents for these contaminants in wastewater because waste recovery is the foundation of the circular economy. Corn, sunflower seed, and pine sawdust residues were tested as potential adsorbents for synthetic aqueous solutions of Ni(II), Zn(II), and Cd (II). To learn more about these residues' structure, content, and adsorption mechanism, characterising efforts were made. The adsorbents' and adsorbates' adsorption capabilities and efficacies were assessed and compared. The results show that all of the biomasses tested are effective substitutes for synthetic materials, with higher adsorption efficiencies. Than 50% Cd was adsorbed first, followed by Zn, and then Ni. When a mixture of all metals was taken into account, adsorption efficiency in sawdust fell at the concentration range examined (as present in real sewage). Finally, clay ceramics (the forerunners of brick) successfully immobilised the heavy metals with an efficiency of over 88.5%. This process would reduce any contamination that might result from the rarely discussed in the literature disposal of used adsorbents.