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Synthesis of new nanoadsorbents, their characterizations and applications in pollutant adsorption in water

Grant number: 22/14834-0
Support Opportunities:Regular Research Grants
Duration: July 01, 2023 - June 30, 2025
Field of knowledge:Engineering - Sanitary Engineering - Water Supply and Wastewater Treatment
Principal Investigator:Patricia Prediger
Grantee:Patricia Prediger
Host Institution: Faculdade de Tecnologia (FT). Universidade Estadual de Campinas (UNICAMP). Limeira , SP, Brazil
Associated researchers: Bruno André Fernandes de Jesus da Silva Nunes ; Melissa Gurgel Adeodato Vieira ; Rafael de Lima Oliveira

Abstract

The present project refers to the synthesis of new nanoadsorbents through protocols based on the principles of green chemistry, their characterizations and applications in the removal of various pollutants in water. The project has two fronts, the first aims at the preparation of reduced graphene oxide (rGO) functionalized with quaternary ammonium salt, both produced by a green route. Regarding the new cationic rGO material, it is believed that it will exhibit unique properties due to the positively charged rGO, which will confer a potential adsorbent capacity for electron-rich organic pollutants. Afterwards, the material will be incorporated into polymeric membranes that will be applied in the removal of dyes and drugs in water. The membranes will act as a support for the rGO and will facilitate its removal from the medium after adsorption and enabling pollutant filtration assays. The optimization of the pollutant removal process will be carried out, as well as the adsorptions in multicomponent systems, and the kinetics, isotherms and thermodynamic parameters linked to the adsorption process will be studied, as well as the membrane reuse. The second front deals with the preparation of mesoporous carbons from sucrose and plastic waste. The porous carbons will be doped and used in the generation of magnetic composites, which will be characterized by several techniques, including a magnetization curve. The design of these new nanoadsorbents was planned to obtain new materials with three-dimensional porous structures doped with metallic cations (Na+, Mg2+ and Al3+) or heteroatoms (P, B, and N) incorporated into the biopolymer agar or into green iron nanoparticles cross-linked with proanthocyanidin. The synthesized adsorbents will be used to remove antibiotics, dyes and other drugs. The optimization of the adsorption process will be carried out by varying several parameters and the kinetics, isotherms and thermodynamic parameters linked to the adsorption process will be studied. In addition, the new magnetic particles can be removed from the aqueous medium using a magnet, which facilitates the removal process, as well as their reuse after use, which will also be investigated. Additionally, it is planned to study the removal efficiency of the antibiotic ciprofloxacin, an emerging contaminant of anthropogenic origin frequently detected in domestic effluents, through the adsorption process in the composites, using standardized toxicity tests to evaluate biomarkers in aquatic species. (AU)

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