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Your search keyword '"Dos Reis, Glaydson S."' showing total 32 results
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32 results on '"Dos Reis, Glaydson S."'

24. Synthesis of Highly Porous Lignin-Sulfonate Sulfur-Doped Carbon for Efficient Adsorption of Sodium Diclofenac and Synthetic Effluents

Author

dos Reis, Glaydson S., Conrad, Sarah, Lima, Eder C., Naushad, Mu., Manavalan, Gopinathan, Gentili, Francesco G., Dotto, Guilherme Luiz, Grimm, Alejandro, dos Reis, Glaydson S., Conrad, Sarah, Lima, Eder C., Naushad, Mu., Manavalan, Gopinathan, Gentili, Francesco G., Dotto, Guilherme Luiz, and Grimm, Alejandro

Abstract

Herein, a novel sulfur-doped carbon material has been synthesized via a facile and sustainable single-step pyrolysis method using lignin-sulfonate (LS), a by-product of the sulfite pulping process, as a novel carbon precursor and zinc chloride as a chemical activator. The sulfur doping process had a remarkable impact on the LS-sulfur carbon structure. Moreover, it was found that sulfur doping also had an important impact on sodium diclofenac removal from aqueous solutions due to the introduction of S-functionalities on the carbon material’s surface. The doping process effectively increased the carbon specific surface area (SSA), i.e., 1758 m2 g−1 for the sulfur-doped and 753 m2 g−1 for the non-doped carbon. The sulfur-doped carbon exhibited more sulfur states/functionalities than the non-doped, highlighting the successful chemical modification of the material. As a result, the adsorptive performance of the sulfur-doped carbon was remarkably improved. Diclofenac adsorption experiments indicated that the kinetics was better described by the Avrami fractional order model, while the equilibrium studies indicated that the Liu model gave the best fit. The kinetics was much faster for the sulfur-doped carbon, and the maximum adsorption capacity was 301.6 mg g−1 for non-doped and 473.8 mg g−1 for the sulfur-doped carbon. The overall adsorption seems to be a contribution of multiple mechanisms, such as pore filling and electrostatic interaction. When tested to treat lab-made effluents, the samples presented excellent performance., Validerad;2024;Nivå 2;2024-09-11 (hanlid);Funder: King Saud University, Riyadh, Saudi Arabia; Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq303.612/2021-5 and 402.450/2021-3); Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES-PROEX 88881.844968/2023-01 and 001); Fundação de Amparo a Pesquisa do Estado doRio Grande do Sul (FAPERGS);Full text license: CC BY

Published
2024
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25. Hybrid nanocellulose material as an adsorbent to remove reactive yellow 2 dye.

Author

Mello, Beatris L., Thue, Pascal S., da Silva, Pâmela V., Saucier, Caroline, dos Reis, Glaydson S., Machado, Fernando M., de Avila Delucis, Rafael, Naushad, Mu., Sher, Farooq, Seliem, Moaaz K., and Lima, Eder C.

Subjects
INDUSTRIAL wastes, X-ray diffraction, PH effect, SURFACE area, DESORPTION, DYES & dyeing, SOLID-liquid equilibrium
Abstract

Textile dyes are frequently disposable in aqueous effluents, making it difficult to remove them from industrial effluents before their release to natural waters. This paper deals with the fabrication of cellulose-based adsorbents by reacting nanocelulose crystalline (nanocel) with N-[3-(trimethoxysilyl)propyl]ethylenediamine (TMSPEDA), forming the hybrid (silylpropyl)ethylenediamine@nanocellulose (SPEDA@nanocel), which was employed as adsorbent for the uptake of reactive yellow 2 dye (RY-2) from aqueous effluents. Characterisation of SPEDA@nanocel was carried out using FTIR, SEM–EDS, XRD, TGA, surface area, pHpzc, and hydrophobicity/hydrophilicity ratio (HI). Also, adsorption studies were thoroughly investigated. The effect of initial pH indicated that the maximum uptake of RY-2 takes place at pH 2, which is an indication of the electrostatic mechanism. The kinetic data carried out with 250 and 500 mg L−1 RY-2 with SPEDA@nanocel followed better the nonlinear fractional-like pseudo-first-order model. The t0.5 and t0.95 for the dye uptake were about 30 and 141 min, respectively. The equilibrium data from 10 to 45 °C indicated that the Liu isotherm model was the best-fitted isothermal model. The maximum sorption capacity attained was 112.3 mg g−1 at 45 °C. The thermodynamic data have shown that the equilibrium was favorable and endothermic, and the ΔH° was compatible with an electrostatic attraction between RY-2 and SPEDA@nanocel. Experiments of desorption of loaded adsorbent showed promising results for real applications since at least 5 adsorption/desorption cycles could be employed without significant changes in the recovery and with high precision. [ABSTRACT FROM AUTHOR]

Published
2024
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30. Process Parameters Optimization, Characterization, and Application of KOH-Activated Norway Spruce Bark Graphitic Biochars for Efficient Azo Dye Adsorption

Author

Guy, Marine, primary, Mathieu, Manon, additional, Anastopoulos, Ioannis P., additional, Martínez, María G., additional, Rousseau, Frédéric, additional, Dotto, Guilherme L., additional, de Oliveira, Helinando P., additional, Lima, Eder C., additional, Thyrel, Mikael, additional, Larsson, Sylvia H., additional, and dos Reis, Glaydson S., additional

Published
2022
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31. Recovery and concentration of Eu(III) from phosphogypsum leachate using ouricuri endocarp

Author

Grimm, Alejandro, Dotto, Guilherme L., Martinello, Kátia da Boit, Silva, Luis F.O., Lima, Éder C., Khan, Mohammad R., Ahmad, Naushad, de Brum, Irineu A.S., and dos Reis, Glaydson S.

Abstract

Ouricuri endocarp was utilized as a biosorbent for the recovery of europium (Eu(III)) from aqueous solutions and rare earth elements (REEs) from authentic leachate derived from phosphogypsum, which encompasses various REEs. Various characterization techniques were applied to analyze the physicochemical and adsorptive properties of the biosorbent. The results indicate that the adsorption kinetic data conform well to the pseudo-first-order model, while the Liu model describes the equilibrium data well. Ouricuri endocarp and Eu interactions are favorable and spontaneous. The maximum adsorption capacity for Eu(III) is determined to be 22.9 mg/g according to the Liu model. Based on experimental results and adsorbent characteristics, the proposed adsorption mechanisms between ouricuri endocarp and Eu include ion exchange and electrostatic interactions as the primary mechanisms. The Eu(III) recovery is also feasible as a continuous flow process demonstrating inclined breakthrough curves and lower values of the length of the mass transfer zone. Ouricuri endocarp demonstrates its selectivity for recovering various REEs from authentic phosphogypsum leachate. It achieves a 98% recovery rate for Eu and approximately 60% for Ce, La, and Nd, affirming its efficacy under real-world conditions. Finally, concentration of REE was done by ashing loaded ouricuri endocarp, and a solid with around 34% (in weight) of REE is obtained.

Published
2024
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32. Synthesis of Highly Porous Lignin-Sulfonate Sulfur-Doped Carbon for Efficient Adsorption of Sodium Diclofenac and Synthetic Effluents.

Author

Dos Reis GS, Conrad S, Lima EC, Naushad M, Manavalan G, Gentili FG, Dotto GL, and Grimm A

Abstract

Herein, a novel sulfur-doped carbon material has been synthesized via a facile and sustainable single-step pyrolysis method using lignin-sulfonate (LS), a by-product of the sulfite pulping process, as a novel carbon precursor and zinc chloride as a chemical activator. The sulfur doping process had a remarkable impact on the LS-sulfur carbon structure. Moreover, it was found that sulfur doping also had an important impact on sodium diclofenac removal from aqueous solutions due to the introduction of S-functionalities on the carbon material's surface. The doping process effectively increased the carbon specific surface area (SSA), i.e., 1758 m 2 g -1 for the sulfur-doped and 753 m 2 g -1 for the non-doped carbon. The sulfur-doped carbon exhibited more sulfur states/functionalities than the non-doped, highlighting the successful chemical modification of the material. As a result, the adsorptive performance of the sulfur-doped carbon was remarkably improved. Diclofenac adsorption experiments indicated that the kinetics was better described by the Avrami fractional order model, while the equilibrium studies indicated that the Liu model gave the best fit. The kinetics was much faster for the sulfur-doped carbon, and the maximum adsorption capacity was 301.6 mg g -1 for non-doped and 473.8 mg g -1 for the sulfur-doped carbon. The overall adsorption seems to be a contribution of multiple mechanisms, such as pore filling and electrostatic interaction. When tested to treat lab-made effluents, the samples presented excellent performance.

Published
2024
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