Abstract
Toxic metals are naturally present in the environment even if there is no anthropic action. Several methods are used for the removal of these metals from water and effluents, such as: chemical precipitation, oxidation/reduction, filtration, ion exchange, membrane separation, and adsorption. Biosorption stands out as an effective treatment because it has a high rate of renewal in nature, low production costs, and high removal of metals due to the possibility of recovery of the contaminant, either by incinerating the biomass or by desorbing it. Thus, this study identified some biochars used as adsorbents for the removal of copper, lead, chromium, and mercury in water. It can be concluded from this study that adsorption is a very efficient technique for removing or recovering heavy metals from the environment. These biocarbons are alternatives that can replace commercial activated carbon because, besides having a low production cost, they have been shown to efficiently remove metal ions, ensuring an effective treatment in compliance with effluent release standards.
Highlights
Contamination of water bodies caused by the increase of toxic pollutants derived from anthropogenic effluents is a current environmental problem
There is a growing interest in the search for low cost alternative materials that can be used in the production of activated charcoal, including agricultural residues that offer a promising future in adsorption processes
One of the most critical points in the use of adsorbents is the suitability of its porous structure, which directly interferes with the diffusion phenomenon, reflecting on the surface area of the solid and influencing the values of adsorption velocity and total adsorption capacity (Souza, 2017)
Summary
Os metais tóxicos estão presentes naturalmente no meio ambiente mesmo que não haja ação antrópica. Vários métodos são utilizados para a remoção desses metais presentes na água e efluentes, tais como: precipitação química, oxidação/redução, filtração, troca iônica, separação por membranas e adsorção. Dessa forma, o objetivo deste estudo foi identificar alguns biocarvões utilizados como adsorventes para a remoção dos metais cobre, chumbo, cromo e mercúrio em água. Através deste estudo pode-se concluir que a adsorção é uma técnica que se mostra bastante eficiente na remoção ou recuperação de metais pesados do meio ambiente. Esses biocarvões são alternativas que podem substituir o carvão ativado comercial, pois a além de ter um baixo custo de produção mostraram ter eficiência na remoção dos íons dos metais de forma a garantir o tratamento eficaz atendendo aos parâmetros legais de lançamento de efluentes.
Sign-in/Register to view highlights & summary Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
