Effect of pH on the simultaneous sorption of Cr(III) and Cr(VI) by magnetic nanomodified lettuce roots in aqueous medium.





Biossorção, Crômio, Nanopartículas magnéticas, Descontaminação de água


The incorrect disposal of industrial effluents containing potentially toxic metals is of great concern for the environment and humans. Among these pollutants, chromium is a metal present most commonly as Cr(III) and Cr(VI). Although rarely found in nature in its hexavalent form, it has been contaminating effluents due to anthropogenic actions such as incorrect disposal of industrial waste. This work conducts a study of the effect of pH on the remediation of aqueous matrices using in natura (LR) and nanomodified (LR-NP) lettuce as a biosorbent material in the simultaneous removal of Cr(III) and Cr(VI) species. The assessment of pH was performed based on the pHPZC to evaluate the best parameters of the individual and simultaneous sorption of Cr(III) and Cr(VI) species. With the solutions' pH variation, the oxidation and reduction process was observed between these species, which start to present different molar fractions. The optimal pH values ​​obtained within the range of 1 to 6, established by the pHPZC, were 6 for Cr(III), 1 for Cr(VI), and 2 for the simultaneous removal testes, with the percentage of Cr retention in the best pH conditions around 50 to 80% with Cr(VI) exhibiting the best adsorption results.


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Biografia do Autor

Gabriela Zutin Beretta, Universidade Federal de São Carlos/UFSCar

Student of the Licentiate Degree in Chemistry at the Federal University of São Carlos (UFSCar), Campus Araras, since 2020. Currently performing Scientific Initiation (ICT-SR/CNPq) at the Laboratory of Polymeric Materials and Biosorbents (Lab-MPB) under the guidance of Prof. . Dr. Elma Neide Vasconcelos Martins Carrilho, working in the field of Analytical Chemistry/Environmental Chemistry, with an emphasis on biosorption. Member of the Polymeric Materials and Biosorbents group since 2020. In 2021/1 she acts as a scholarship tutor in the Academic Assistance Program for Undergraduate Students (PAAEG) in the subjects of Quantitative Analytical Chemistry and Physical Chemistry 1. From March to October 2020 was a Technological Initiation Scholarship (PIBITI/CNPq) at the Polymeric Materials and Biosorbents laboratory. She has a bachelor's degree in Chemistry from UFSCar, Campus São Carlos, not completed, joining the course in 2017, and worked as a project advisor at the Junior Chemistry Company of São Carlos, Atom Jr.

Geórgia Labuto, Universidade Federal de São Paulo/UNIFESP

She is a professor at the Federal University of São Paulo (since 2010), having been a professor at the University of São Paulo (2007-2010). She has a degree in Chemistry from the Federal University of Espírito Santo (1997), a master's degree (2000) and a Ph.D. (2004) in Chemistry from the Federal University of São Carlos, concentration area of ​​Analytical Chemistry, having developed research with Embrapa Pecuária Sudeste. She holds a PhD in Sandwich at the University of Coimbra (2003). She did post-doctoral studies at the Center for Nuclear Energy in Agriculture at USP (2005) and at Universidade Nova de Lisboa (2019-2020). Working in the environmental area with a focus on remediation, she has as a line of research the treatment of water for human consumption and effluents. To this end, it works in studies of prediction and prioritization of emerging contaminants in water bodies, prospecting for microplastics in limnic environments, developing materials for adsorption of emerging contaminants and oil, advanced oxidative processes for the treatment of water, effluents and solid waste from adsorbents . She was a collaborating researcher at the Center for Functional Ecology of the University of Coimbra, Portugal (2004 to 2013 and is a member of the International Water Association. She is linked to the postgraduate programs in Integrated Environmental Analysis, and in Chemistry - Science and Technology of Sustainability. Mother from a smart boy, she was away from academic activities from May 2009 to May 2010 due to risks of contracting H1N1 flu during pregnancy and maternity leave.




Como Citar

GABRIEL, L.; SOARES, B. C.; BERETTA, G. Z.; ABILIO, T. E.; LABUTO, G. .; CARRILHO, E. N. V. M. Effect of pH on the simultaneous sorption of Cr(III) and Cr(VI) by magnetic nanomodified lettuce roots in aqueous medium. . Ambiente: Gestão e Desenvolvimento, [S. l.], v. 1, n. 1, 2021. DOI: 10.24979/ambiente.v1i1.946. Disponível em: https://periodicos.uerr.edu.br/index.php/ambiente/article/view/946. Acesso em: 26 nov. 2022.