Vieira, Júlia CondéDiniz, Mariana Cristine CoelhoMendes, Louise AparecidaSinisterra Millán, Ruben DarioRodrigues, Guilherme DiasOrlando, Ricardo MathiasWindmoller, Cláudia Carvalhinho2023-05-232023-05-232021VIEIRA, J. C. et al. Bixin as a new class of biosorbent for Hg2+ removal from aqueous solutions. Environmental Nanotechnology, Monitoring & Management, v. 15, artigo 100407, 2021. Disponível em: <https://www.sciencedirect.com/science/article/pii/S2215153220303901?via%3Dihub>. Acesso em: 11 out. 2022.2215-1532http://www.repositorio.ufop.br/jspui/handle/123456789/16642In this study, the apocarotenoid bixin was investigated as a potential biosorbent for Hg2+ in aqueous solutions. Bixin was used to form a thin film on an inert support using the drop-coating technique. This film was char- acterised using ATR-FTIR, SEM, and TGA-DTG techniques. Parameters that influence adsorption, such as pH, temperature, NaCl concentration, salt type, bixin mass, and supports for the bixin film, were evaluated. Using 0.112 mg of a bixin covering on a cellulose filter, the sorbent material was able to remove 75 % of Hg2+ from a 2.0 mL, 0.3 mg g− 1 , pH 6.00, 25 ◦C solution after 180 min of contact. Kinetics studies were carried out between 5 and 1440 min, and the pseudo-first-order adsorption model was applied. Equilibrium isotherm data were ana- lysed, and the best fit was for the non-linear Freundlich model, with an R2 of 0.9868, RMSE of 0.37, and maximum sorption capacity of 85.38 mg g− 1 obtained by the Langmuir model. The bixin film was applied in spiked environmental samples (lake and mining effluent), and it achieved 86 % Hg2+ removal. The results show that the bixin film is a suitable alternative for efficiently removing mercury from various aqueous systems. This introduces a new class of biosorbent based on apocarotenoids, which are sustainable, low cost, nontoxic, and easily obtainable.en-USrestritoAdsorptionApocarotenoidsBiosorptionHeavy metalsMercuryArtigo publicado em periodicohttps://www.sciencedirect.com/science/article/pii/S2215153220303901?via%3Dihubhttps://doi.org/10.1016/j.enmm.2020.100407