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48 results on '"Netto, Matias S."'

45. Transforming a volcanic rock powder waste into an efficient adsorbent to remove dyes (acid green 16 and acid red 97) and metals (Ag+, Co2+, and Cu2+) from water.

Author

Rossatto, Diovani L., de Lima, Rachel, Netto, Matias S., Vieillard, Julien, Silva, Luis F. O., Pinto, Diana, and Dotto, Guilherme L.

Subjects
VOLCANIC ash, tuff, etc., METALS, ADSORPTION capacity, WATER pollution, POLLUTANTS, DYE-sensitized solar cells, MALACHITE green, METAL powders
Abstract

This study searched for the best synthesis route for producing an adsorbent from the alkaline fusion of volcanic rock powder waste. The samples synthesized under different conditions of temperature and alkalizing ratio/precursor material, nine in total (NP.F, NP.F1, NP.F2,...NP.F8), were used in the adsorption of acid green 16 (AG 16) and acid red 97 (AR 97) dyes and Ag+, Co2+, and Cu2+ ions. Subsequently, the 22 central composite rotational design (CCRD) was applied, and the effects of the alkalizing ratio (NaOH)/volcanic rock (VR) and temperature (T) on the synthesis process were analyzed in terms of their influence on the physical properties of the materials and in the process of adsorption of contaminants. From the experimental design, it can be seen that the independent variables alkalizing ratio/volcanic rock and temperature greatly influence the characteristic and synthesis of adsorbent materials by alkaline fusion, which in turn reflects on the results achieved in the adsorption of contaminants. Therefore, the temperature of 550 °C and NaOH/VR ratio equal to 1 was the most satisfactory synthesis route to obtain high values of adsorption capacity (q, mg g−1) and removal (R, %) for all studied contaminants, as well as the optimization of the physical characteristics of the material. For example, the adsorption capacity of dye AG 16 was 49.1 mg g−1, and for Ag+ was 66.2 mg g−1, while the removal percentages were 97.6% and 93.4%, respectively. This approach made it possible to transform volcanic rock powder wastes into an efficient adsorbent to treat contaminated waters with dyes and metals. [ABSTRACT FROM AUTHOR]

Published
2023
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46. Optimization of ketoprofen adsorption from aqueous solutions and simulated effluents using H2SO4 activated Campomanesia guazumifolia bark.

Author

Preigschadt, Isadora A., Bevilacqua, Raíssa C., Netto, Matias S., Georgin, Jordana, Franco, Dison S. P., Mallmann, Evandro S., Pinto, Diana, Foletto, Edson L., and Dotto, Guilherme L.

Subjects
AQUEOUS solutions, NONSTEROIDAL anti-inflammatory agents, RESPONSE surfaces (Statistics), DRUG adsorption, ADSORPTION (Chemistry)
Abstract

This study used the bark of the forest species Campomanesia guazumifolia modified with H2SO4 to absorb the anti-inflammatory ketoprofen from aqueous solutions. FTIR spectra confirmed that the main bands remained after the chemical treatment, with the appearance of two new bands related to the elongation of the carbonyl group present in hemicellulose. Micrographs confirmed that the surface started to contain a new textural shape after acid activation, having new pores and cavities. The drug adsorption's optimum conditions were obtained by response surface methodology (RSM). The adsorption was favored at acidic pH (2). The dosage of 1 g L−1 was considered ideal, obtaining good indications of removal and capacity. The Elovich model very well represented the kinetic curves. The isotherm studies indicated that the increase in temperature negatively affected the adsorption of ketoprofen. A maximum adsorption capacity of 158.3 mg g−1 was obtained at the lower temperature of 298 K. Langmuir was the best-fit isotherm. Thermodynamic parameters confirmed the exothermic nature of the system (ΔH0 = −8.78 kJ mol−1). In treating a simulated effluent containing different drugs and salts, the removal values were 35, 50, and 80% at 15, 30, and 180 min, respectively. Therefore, the development of adsorbent from the bark of Campomanesia guazumifolia treated with H2SO4 represents a remarkable alternative for use in effluent treatment containing ketoprofen. [ABSTRACT FROM AUTHOR]

Published
2022
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47. One step acid modification of the residual bark from Campomanesia guazumifolia using H2SO4 and application in the removal of 2,4-dichlorophenoxyacetic from aqueous solution.

Author

Bevilacqua, Raíssa C., Preigschadt, Isadora A., Netto, Matias S., Georgin, Jordana, Franco, Dison S. P., Mallmann, Evandro S., Silva, Luis F. O., Pinto, Diana, Foletto, Edson L., and Dotto, Guilherme L.

Subjects
AQUEOUS solutions, GLYPHOSATE, POISONS, SULFURIC acid, HERBICIDES, AMORPHOUS substances, ATRAZINE
Abstract

The residual bark of the tree species Campomanesia guazumifolia was successfully modified with H2SO4 and applied to remove the toxic herbicide 2.4-dichlorophenoxyacetic (2.4-D) from aqueous solutions. The characterization techniques made it possible to observe that the material maintained its amorphous structure; however, a new FTIR band emerged, indicating the interaction of the lignocellulosic matrix with sulfuric acid. Micrographs showed that the material maintained its irregular shape; however, new spaces and cavities appeared after the acidic modification. Regardless of the herbicide concentration, the system tended to equilibrium after 120 min. Using the best statistical coefficients, the Elovich model was the one that best fitted the kinetic data. The temperature increase in the system negatively influenced the adsorption of 2.4-D, reaching a maximum capacity of 312.81 mg g−1 at 298 K. The equilibrium curves showed a better fit to the Tóth model. Thermodynamic parameters confirmed the exothermic nature of the system (ΔH0 = −59.86 kJ mol−1). As a residue obtained from urban pruning, the bark of Campomanesia guazumifolia treated with sulfuric acid is a promising and highly efficient alternative for removing the widely used and toxic 2.4-D herbicide from aqueous solutions. [ABSTRACT FROM AUTHOR]

Published
2021
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48. One step acid modification of the residual bark from Campomanesia guazumifolia using H 2 SO 4 and application in the removal of 2,4-dichlorophenoxyacetic from aqueous solution.

Author

Bevilacqua RC, Preigschadt IA, Netto MS, Georgin J, Franco DSP, Mallmann ES, Silva LFO, Pinto D, Foletto EL, and Dotto GL

Subjects
2,4-Dichlorophenoxyacetic Acid chemistry, Adsorption, Hydrogen-Ion Concentration, Kinetics, Plant Bark chemistry, Thermodynamics, Herbicides chemistry, Water Pollutants, Chemical analysis
Abstract

The residual bark of the tree species Campomanesia guazumifolia was successfully modified with H 2 SO 4 and applied to remove the toxic herbicide 2.4-dichlorophenoxyacetic (2.4-D) from aqueous solutions. The characterization techniques made it possible to observe that the material maintained its amorphous structure; however, a new FTIR band emerged, indicating the interaction of the lignocellulosic matrix with sulfuric acid. Micrographs showed that the material maintained its irregular shape; however, new spaces and cavities appeared after the acidic modification. Regardless of the herbicide concentration, the system tended to equilibrium after 120 min. Using the best statistical coefficients, the Elovich model was the one that best fitted the kinetic data. The temperature increase in the system negatively influenced the adsorption of 2.4-D, reaching a maximum capacity of 312.81 mg g -1 at 298 K. The equilibrium curves showed a better fit to the Tóth model. Thermodynamic parameters confirmed the exothermic nature of the system (ΔH 0 = -59.86 kJ mol -1 ). As a residue obtained from urban pruning, the bark of Campomanesia guazumifolia treated with sulfuric acid is a promising and highly efficient alternative for removing the widely used and toxic 2.4-D herbicide from aqueous solutions.

Published
2021
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