Mariel Atia | CNEA - Academia.edu (original) (raw)
Papers by Mariel Atia
Nano-Structures & Nano-Objects, 2017
The photocatalytic degradation of p-aminobenzoic acid was studied using C-doped ZnO nanorods as t... more The photocatalytic degradation of p-aminobenzoic acid was studied using C-doped ZnO nanorods as the catalyst synthesized through a low cost and simple precipitation method. The as-synthesized nanorods were fully characterized by SEM, TEM, XRD, BET and XPS. The photocatalytic degradation of p-aminobenzoic acid was carried out under sunlight irradiation. Optimal experimental conditions were determined for C-doped ZnO nanorods with a catalyst dosage of 0.5 g/L in a p-aminobenzoic acid solution, and 97% degradation was obtained. The results showed that the C-doped ZnO nanorods can be reusable and retain good photodegradation efficiency. A pseudo first order reaction was found to provide the best correlations, with a constant rate of 0.028 min −1 .
Physica E: Low-dimensional Systems and Nanostructures, 2017
Materials Today Communications
Abstract This paper focuses on the solar-assisted photodegradation of Methyl Orange (MO) dye as m... more Abstract This paper focuses on the solar-assisted photodegradation of Methyl Orange (MO) dye as model molecule using Cu-doped ZnO nanorods synthesized through a chemical method using a solution of zinc chloride (ZnCl2) as precursor, and with the addition of different concentrations of Cu(NO3)2 and NaOH at 65 °C. The samples were characterized by TEM, XRD, XPS, BET and UV–vis spectroscopy. The amount of Cu and catalyst dosage on the rate of photodegradation were investigated. The measurements of the band gap made by visible UV–vis spectroscopy showed that it decreased as the dopant material increased. The Cu-doped ZnO nanorods showed excellent photodegradation efficiency and good recycling performance. The decomposition reaction was found to be pseudo–first order. Optimal experimental conditions were determined for Cu-doped ZnO nanorods with a catalyst dose of 0.3 g/L and 99% of MO degradation was obtained after 120 min of solar exposure.
This paper focuses on the solar-assisted photodegradation of Methyl Orange (MO) dye as model mole... more This paper focuses on the solar-assisted photodegradation of Methyl Orange (MO) dye as model molecule using Cu-doped ZnO nanorods synthesized through a chemical method using a solution of zinc chloride (ZnCl2) as precursor, and with the addition of different concentrations of Cu(NO3)2 and NaOH at 65 °C. The samples were characterized by TEM, XRD, XPS, BET and UV–Vis spectroscopy. The amount of Cu and catalyst dosage on the rate of photodegradation were investigated. The measurements of the band gap made by visible UV-Vis spectroscopy showed that it decreased as the dopant material increased. The Cu doped ZnO nanorods showed excellent photodegradation efficiency and good recycling performance. The decomposition reaction was found to be pseudo–first order. Optimal experimental conditions were determined for Cu-doped ZnO nanorods with a catalyst dose of 0.3 g/L and 99% of MO degradation was obtained after 120 min of solar exposure.
ZnO nanostructures were synthesized through a chemical method using different Zn precursors and h... more ZnO nanostructures were synthesized through a chemical method using different Zn precursors and hexamethylenetetramine (HMTA) at 90 °C. The effects of the reactants on the morphological evolution of ZnO nanorods were investigated. The samples were characterized by using XRD, SEM, EDX and BET. The hexagonal wurtzite phase of ZnO was confirmed by X-ray diffraction (XRD). The performed analysis indicated that different morphologies were obtained by changing the reactants. RESUMEN Se sintetizaron nanoestructuras de ZnO por método químico usando diferentes precursores de Zn y hexametilentetraamina (HMTA) a 90 °C y se investigaron los efectos de los reactivos sobre la evolución morfológica de las nanovarillas de ZnO. Las muestras se caracterizaron mediante DRX, SEM, EDX y BET. Se confirmó la fase hexagonal wurtzita para todas las muestras por difracción de rayos x (DRX). Los análisis realizados indican que cambiando los reactivos se obtienen diferentes morfologías.
The photocatalytic degradation of p-aminobenzoic acid was studied using C-doped ZnO nanorods as t... more The photocatalytic degradation of p-aminobenzoic acid was studied using C-doped ZnO nanorods as the catalyst synthesized through a low cost and simple precipitation method. The as-synthesized nanorods were fully characterized by SEM, TEM, XRD, BET and XPS. The photocatalytic degradation of p-aminobenzoic acid was carried out under sunlight irradiation. Optimal experimental conditions were determined for C-doped ZnO nanorods with a catalyst dosage of 0.5 g/L in a p-aminobenzoic acid solution, and 97% degradation was obtained. The results showed that the C-doped ZnO nanorods can be reusable and retain good photodegradation efficiency. A pseudo first order reaction was found to provide the best correlations, with a constant rate of 0.028 min −1 .
In order to decrease the damage caused by dye pollution to environment and human, the use of phot... more In order to decrease the damage caused by dye pollution to environment and human, the use of photocatalysts to convert organic compounds in contaminated water into non-toxic chemicals has been extensively investigated . Photocatalysis has been emerged as a valid alternative to solve this problem . Various photocatalysts, especially metal oxide such as TiO2, SnO2 and ZnO has attracted extensive attention for the degradation of non-biodegradable pollutants under UV irradiation . ZnO is an interesting chemically and thermally stable n-type semiconductor with a large exciton binding energy of 60 meV and large band gap energy of 3.37 eV at room temperature. Comparing to other wide band-gap semiconductors, ZnO possesses higher quantum efficiency and higher exciton energy. Furthermore, it is one of the most propitious materials due to its applications in several areas, such as ultraviolet laser, high power light emitting diode, spintronic devices [9-11], solar cells , photodetectors [14], heterogeneous catalysis [15-17], piezo-electric transducers [18], cosmetic [19], and antibacterial treatment [20,21].
ZnO nanorods were synthesized through a simple chemical method at low temperature. Different morp... more ZnO nanorods were synthesized through a simple chemical method at low temperature. Different morphologies were obtained changing the order of addition of reactants. The X-ray diffraction data indicated that the samples had hexagonal wurtzite structure. The optical band gap of the ZnO samples calculated using Tauc model was 3.19 eV.
Nano-Structures & Nano-Objects, 2017
The photocatalytic degradation of p-aminobenzoic acid was studied using C-doped ZnO nanorods as t... more The photocatalytic degradation of p-aminobenzoic acid was studied using C-doped ZnO nanorods as the catalyst synthesized through a low cost and simple precipitation method. The as-synthesized nanorods were fully characterized by SEM, TEM, XRD, BET and XPS. The photocatalytic degradation of p-aminobenzoic acid was carried out under sunlight irradiation. Optimal experimental conditions were determined for C-doped ZnO nanorods with a catalyst dosage of 0.5 g/L in a p-aminobenzoic acid solution, and 97% degradation was obtained. The results showed that the C-doped ZnO nanorods can be reusable and retain good photodegradation efficiency. A pseudo first order reaction was found to provide the best correlations, with a constant rate of 0.028 min −1 .
Physica E: Low-dimensional Systems and Nanostructures, 2017
Materials Today Communications
Abstract This paper focuses on the solar-assisted photodegradation of Methyl Orange (MO) dye as m... more Abstract This paper focuses on the solar-assisted photodegradation of Methyl Orange (MO) dye as model molecule using Cu-doped ZnO nanorods synthesized through a chemical method using a solution of zinc chloride (ZnCl2) as precursor, and with the addition of different concentrations of Cu(NO3)2 and NaOH at 65 °C. The samples were characterized by TEM, XRD, XPS, BET and UV–vis spectroscopy. The amount of Cu and catalyst dosage on the rate of photodegradation were investigated. The measurements of the band gap made by visible UV–vis spectroscopy showed that it decreased as the dopant material increased. The Cu-doped ZnO nanorods showed excellent photodegradation efficiency and good recycling performance. The decomposition reaction was found to be pseudo–first order. Optimal experimental conditions were determined for Cu-doped ZnO nanorods with a catalyst dose of 0.3 g/L and 99% of MO degradation was obtained after 120 min of solar exposure.
This paper focuses on the solar-assisted photodegradation of Methyl Orange (MO) dye as model mole... more This paper focuses on the solar-assisted photodegradation of Methyl Orange (MO) dye as model molecule using Cu-doped ZnO nanorods synthesized through a chemical method using a solution of zinc chloride (ZnCl2) as precursor, and with the addition of different concentrations of Cu(NO3)2 and NaOH at 65 °C. The samples were characterized by TEM, XRD, XPS, BET and UV–Vis spectroscopy. The amount of Cu and catalyst dosage on the rate of photodegradation were investigated. The measurements of the band gap made by visible UV-Vis spectroscopy showed that it decreased as the dopant material increased. The Cu doped ZnO nanorods showed excellent photodegradation efficiency and good recycling performance. The decomposition reaction was found to be pseudo–first order. Optimal experimental conditions were determined for Cu-doped ZnO nanorods with a catalyst dose of 0.3 g/L and 99% of MO degradation was obtained after 120 min of solar exposure.
ZnO nanostructures were synthesized through a chemical method using different Zn precursors and h... more ZnO nanostructures were synthesized through a chemical method using different Zn precursors and hexamethylenetetramine (HMTA) at 90 °C. The effects of the reactants on the morphological evolution of ZnO nanorods were investigated. The samples were characterized by using XRD, SEM, EDX and BET. The hexagonal wurtzite phase of ZnO was confirmed by X-ray diffraction (XRD). The performed analysis indicated that different morphologies were obtained by changing the reactants. RESUMEN Se sintetizaron nanoestructuras de ZnO por método químico usando diferentes precursores de Zn y hexametilentetraamina (HMTA) a 90 °C y se investigaron los efectos de los reactivos sobre la evolución morfológica de las nanovarillas de ZnO. Las muestras se caracterizaron mediante DRX, SEM, EDX y BET. Se confirmó la fase hexagonal wurtzita para todas las muestras por difracción de rayos x (DRX). Los análisis realizados indican que cambiando los reactivos se obtienen diferentes morfologías.
The photocatalytic degradation of p-aminobenzoic acid was studied using C-doped ZnO nanorods as t... more The photocatalytic degradation of p-aminobenzoic acid was studied using C-doped ZnO nanorods as the catalyst synthesized through a low cost and simple precipitation method. The as-synthesized nanorods were fully characterized by SEM, TEM, XRD, BET and XPS. The photocatalytic degradation of p-aminobenzoic acid was carried out under sunlight irradiation. Optimal experimental conditions were determined for C-doped ZnO nanorods with a catalyst dosage of 0.5 g/L in a p-aminobenzoic acid solution, and 97% degradation was obtained. The results showed that the C-doped ZnO nanorods can be reusable and retain good photodegradation efficiency. A pseudo first order reaction was found to provide the best correlations, with a constant rate of 0.028 min −1 .
In order to decrease the damage caused by dye pollution to environment and human, the use of phot... more In order to decrease the damage caused by dye pollution to environment and human, the use of photocatalysts to convert organic compounds in contaminated water into non-toxic chemicals has been extensively investigated . Photocatalysis has been emerged as a valid alternative to solve this problem . Various photocatalysts, especially metal oxide such as TiO2, SnO2 and ZnO has attracted extensive attention for the degradation of non-biodegradable pollutants under UV irradiation . ZnO is an interesting chemically and thermally stable n-type semiconductor with a large exciton binding energy of 60 meV and large band gap energy of 3.37 eV at room temperature. Comparing to other wide band-gap semiconductors, ZnO possesses higher quantum efficiency and higher exciton energy. Furthermore, it is one of the most propitious materials due to its applications in several areas, such as ultraviolet laser, high power light emitting diode, spintronic devices [9-11], solar cells , photodetectors [14], heterogeneous catalysis [15-17], piezo-electric transducers [18], cosmetic [19], and antibacterial treatment [20,21].
ZnO nanorods were synthesized through a simple chemical method at low temperature. Different morp... more ZnO nanorods were synthesized through a simple chemical method at low temperature. Different morphologies were obtained changing the order of addition of reactants. The X-ray diffraction data indicated that the samples had hexagonal wurtzite structure. The optical band gap of the ZnO samples calculated using Tauc model was 3.19 eV.