Abstract
The present project refers to the synthesis of new nanoadsorbents based on graphene oxide, nanocellulose and chitosan, their characterization and application in the removal of several pollutants in water, especially dyes and drugs. The project has two fronts, the first one aims at the preparation of chitosan beads containing nanocomposites based on crystalline nanocellulose substituted with polystyrene and graphene oxide and the other proposes the preparation of magnetic particles of chitosan coated with reduced graphene oxide substituted with safranin. Both materials will be applied in the removal of pollutants in water via adsorption. In the new nanocellulose-polystyrene material, it is believed that it will exhibit unique properties from the nanocellulose and the hydrophobic polymer. After the characterization, the material will be incorporated to the graphene oxide and used in the generation of chitosan beads, which will later be used in the adsorption of dyes in water, especially malachite green. The CS beads will act as a solid support for the adsorbent immobilization, which confers an ease of removal after adsorption and a large surface area due to the sphere porosity. The optimization of the pollutant removal process will be carried out, as well as, the influence of the addition of salts like NaCl will be studied. In addition, kinetics, isotherms and thermodynamic parameters will be studied, as well as the reuse process of the beads after use. In addition, the continuous flow adsorption process will be evaluated. Additionally, it is planned to study the removal of the drug propranolol through the adsorption process by the spheres to be synthesized, using standardized toxicity tests and alternative methods such as assessment of biomarkers in aquatic species.. The second front deals with the reduced graphene oxide preparation and its modification by the insertion of the safranin cationic compound. After the synthesis of this graphene derivative, its incorporation into magnetic particles of chitosan crosslinked with glutaraldehyde is objectified. After preparation, these materials will have their properties and structures characterized by various techniques, including scanning electron microscopy and magnetization curve. The design of this new nanosorbents was planned with the intention of obtaining an essentially cationic material, which has an extensive sp2 system that will be reached by the presence of the chitosan/safranin and reduced graphene oxide, respectively. The new adsorbent particles will be employed in the removal of anionic dyes, especially orange II. The optimization of the removal process will be performed by varying several parameters and the kinetics, isotherms and thermodynamic parameters linked to the adsorption process will be studied. In addition, the novel adsorbent particles may be removed from the aqueous medium by the use of a magnet, which facilitates the removal process, as well as its reuse after use, which will also be investigated. (AU)
Scientific publications
(5)
(References retrieved automatically from Web of Science and SciELO through information on FAPESP grants and their corresponding numbers as mentioned in the publications by the authors)
VENDEMIATTI, JOSIANE A. SOUZA;
CAMPAROTTO, NATALIA G.;
VIDAL, CRISTIANE;
CRISTALE, JOYCE;
AGAPITO, ESTEVAO VIEIRA DE MORAES;
OLIVEIRA, ADRIA CALOTTO;
RODRIGUES, EVERTON A.;
MONTAGNER, CASSIANA C.;
UMBUZEIRO, GISELA A.;
PREDIGER, PATRICIA.
New benzotriazoles generated during textile dyeing process: Synthesis, hazard, water occurrence and aquatic risk assessment.
JOURNAL OF HAZARDOUS MATERIALS,
v. 403,
FEB 5 2021.
Web of Science Citations: 1.
MORAIS DA SILVA, PAULA MAYARA;
CAMPAROTTO, NATALIA GABRIELE;
GREGO, KATHER TAINA;
FRANCO PICONE, CAROLINA SIQUEIRA;
PREDIGER, PATRICIA.
Adsorptive removal of basic dye onto sustainable chitosan beads: Equilibrium, kinetics, stability, continuous-mode adsorption and mechanism.
SUSTAINABLE CHEMISTRY AND PHARMACY,
v. 18,
DEC 2020.
Web of Science Citations: 2.
MORAIS DA SILVA, PAULA MAYARA;
CAMPAROTTO, NATALIA GABRIELE;
NEVES, TAUANY DE FIGUEIREDO;
GREGO LIRA, KATHERLY TAINA;
MASTELARO, VALMOR ROBERTO;
FRANCO PICONE, CAROLINA SIQUEIRA;
PREDIGER, PATRICIA.
Effective removal of basic dye onto sustainable chitosan beads: Batch and fixed-bed column adsorption, beads stability and mechanism.
SUSTAINABLE CHEMISTRY AND PHARMACY,
v. 18,
DEC 2020.
Web of Science Citations: 0.