Photocatalytic Degradation of Methylene Blue and Methyl Orange with Fe-Doped ZnO Nanoparticles Modified with Natural Zeolite and Montmorillonite: Comparative Study

Afifah, Nur; Adriani, Siti; Djaja, Nadia Febiana; Saleh, Rosari

doi:10.4028/www.scientific.net/amr.1123.295

Cited by 17 publications

(6 citation statements)

References 35 publications

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“…LDHs were identified by the reflections located at (003), ( 006 [33] reported a hydrotalcite and periclase phase coexistence in the mixtures. Figure 1b shows the peaks indexed as (100), (002), ( 101), ( 102), ( 110), ( 103) and (112) matching with the wurtzite structure for ZnO (ICDD: 01-074-9941) consistent with data reported by [31]. It was not feasible to find any differences in crystallinity among the samples.…”

Section: Characterization Of Layered Double Hydroxidessupporting

confidence: 78%

Photocatalytic Degradation of Mixed Dyes in Aqueous Phase by MgAlTi and ZnAlTi Mixed Oxides

et al. 2020

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This study reported the synthesis and evaluation of mixed metal oxides MgO/Al 2 O 3 -TiO 2 and ZnO/Al 2 O 3 -TiO 2 as heterogeneous photocatalysts for the potential degradation of a mixture of organic dyes such as methylene blue and methyl orange. First, hydrotalcites were synthesized by two different methods (conventional and microwave); then they were treated at 500 °C to obtain the corresponding Mg/Al-Ti and Zn/Al-Ti mixed metal oxides. The Layered Double Hydroxide (LDH) and the Mixed Metal Oxides were characterized by N 2 adsorption-desorption, X-ray Diffraction, Fourier transform infrared, X-Ray photoelectron Spectrometry and Scanning Electron Microscopy. The degradation processes of the dyes were carried out under ultraviolet light irradiation and absorbance readings were compared using a UV-vis spectrometer. The ensuing degradation of products was corroborated through a mass spectrometry analysis. According to the photodegradation efficiency of dyes under UV irradiation, the activity of the samples showed the following order: ZnAlTiM > ZnAlTiC > MgAlTiC > MgAlTiM. The improvement in the activity of ZnAlTiM may be attributed to its lowest reflectance and highest degree of UV light absorbance, its smallest valence band and its ZnO-support interaction. Degradations of 25% and 68% were achieved for methyl orange and methylene blue, respectively, after 120 min of reaction. The degradation process conforms to the Langmuir-Hinshelwood type kinetic model.

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Section: Characterization Of Layered Double Hydroxidessupporting

confidence: 78%

Photocatalytic Degradation of Mixed Dyes in Aqueous Phase by MgAlTi and ZnAlTi Mixed Oxides

et al. 2020

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“…On the other hand, Afifah et al 5 . achieved different optimal pH values for the removal of two different dyes when applying the photocatalysis process using Fe‐doped ZnO as catalyst.…”

Section: Resultsmentioning

confidence: 99%

“…The photocatalytic process is based on the production of the highly reactive hydroxyl radical by using heterogeneous catalysts, combined, for instance, with hydrogen peroxide under ultraviolet/visible (UV/Vis) light. Photocatalysis has been effectively used for the removal of several dyes from wastewater 5–9 . The generally accepted mechanism of heterogeneous photocatalysis includes redox reactions of adsorbed water, hydroxyl anions, and oxygen molecules or other substances 10–14 …”

Section: Introductionmentioning

confidence: 99%

Photocatalytic wet peroxide assisted degradation of Orange II dye by reduced graphene oxide and zeolites

Ovhal

Rodrigues

Madeira

2020

J of Chemical Tech & Biotech

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BackgroundPhotocatalytic degradation of Orange II (OII) dye has been carried out with commercially available materials, namely sodium Y zeolite (NaY), ammonium Y zeolite (NH4Y), and reduced graphene oxide (RGO). The catalysts were characterized by N2 adsorption at −196 °C, pH at the point of zero charge (pHpzc), and ultraviolet/visible (UV/Vis) diffuse reflectance absorbance. The initial screening of processes like adsorption, oxidation with hydrogen peroxide alone, direct photolysis, combination of H2O2 with the catalyst, and/or with UV/Vis radiation has been done. For the process with better performance (radiation combined with the oxidant and using the materials as photocatalysts), a parametric study was carried out to evaluate the effect of pH, H2O2 concentration, catalyst dose, radiation intensity, and radiation type (UV/Vis or visible radiation) in OII degradation and mineralization.ResultsThe screening demonstrated that radiation plays an important role in the hydroxyl radical formation and, inherently, in the oxidation of OII and in the mineralization of the organic compounds formed. Still, for all catalysts tested, the existence of optima in terms of pH (2.0), catalyst dose (100 mg L−1), and H2O2 concentration (6 mM) was found, while the maximum radiation intensity (500 W m−2) and UV/Vis radiation incidence benefits the oxidation process. However, the best process performance was achieved when using the catalyst that absorbs more radiation (RGO), yielding OII and TOC removals of 97.7% and 87.9%, respectively, after 90 min of reaction time.ConclusionTaking into account the great performance reached, a possible application of such catalysts in the treatment of textile dyeing effluents is anticipated. © 2020 Society of Chemical Industry (SCI)

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“…To calculate the band-gap energy of our samples from the absorption spectra, and because MgO is a direct band-gap semiconductor, the Tauc formula was used [35][36][37]. When (αhν) 2 = 0, Eg = hν, an extrapolation of the linear region of the plot of (αhν) 2 versus photon energy (hν) on the x-axis gives the value of the band-gap energy Eg. Figure 10 shows the extrapolation of the curves (αhν) 2 as a function of the photon energy (hν).…”

Section: Uv-visible Analysismentioning

confidence: 99%

“…Scientists are concerned about finding solutions to the growing pollution of air and potable water and are notably looking for cost-effective treatments to eliminate organic dissolved dyes from effluents or get rid of NO 2 and CO 2 in air [1]. Heterogeneous photocatalysis using semiconductor oxides has emerged as one of the effective methods in the degradation of an organic pollutant to clear out various dangerous species from wastewater without any secondary pollution [2,3]. Through the years, several semiconductor oxides were utilized as efficient photocatalysts, such as: TiO 2 , ZnO, ZnSe, WO 3 , Fe 2 O 3 , etc… [4][5][6].…”

Section: Introductionmentioning

confidence: 99%

Effects of Erbium Incorporation on Structural, Surface Morphology, and Degradation of Methylene Blue Dye of Magnesium Oxide Nanoparticles

Ameur

Khantoul

Boudine

et al. 2022

J Inorg Organomet Polym

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This paper reports the chemical synthesis of MgO and Er-doped MgO nanoparticles (NPs) by the sol-gel method. Their microstructural, optical characterization and the evaluation of their photocatalytic activity are presented. The synthesized NPs were characterized by means of Xray diffraction (XRD), Fourier Transform Infrared Spectroscopy (FTIR), Environmental Scanning Electron Microscopy (ESEM), Transmission Electron Microscopy (TEM), Energy Dispersive X-ray Spectroscopy (EDX), UV-visible and Photoluminescence (PL) spectroscopy. The effective synthesis of cubic MgO compound is attested by XRD, FTIR and electron diffraction in TEM. Er 2 O 3 cubic secondary phase is found in the 2 and 3 wt. % Erdoped MgO samples. The average size of the roundish cuboid-shaped crystallites decreases from 50 nm to 32 nm upon the incorporation of the rare earth element (TEM, XRD).Concomitantly, the size of flakes in which the NPs do agglomerate follows the same trend (ESEM). UV-Visible results show that the calculated band-gap energy of the NPs was in the 5.23 to 5.35 eV range. PL analysis showed that all samples have visible emissions owing to the formation of defects in the MgO band-gap. The photocatalytic activity against methylene blue dye was evaluated under UV light irradiation. The photocatalytic results showed an improvement in degradation efficiency with the addition of erbium in samples, with a maximal MB dye removal for the 3 wt. % Er-doped MgO sample after 90 min irradiation. The performance is ascribed to a higher separation of the photo-generated (electron-hole) and larger surface area.

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Photocatalytic Degradation of Methylene Blue and Methyl Orange with Fe-Doped ZnO Nanoparticles Modified with Natural Zeolite and Montmorillonite: Comparative Study

Cited by 17 publications

References 35 publications

Photocatalytic Degradation of Mixed Dyes in Aqueous Phase by MgAlTi and ZnAlTi Mixed Oxides

Photocatalytic Degradation of Mixed Dyes in Aqueous Phase by MgAlTi and ZnAlTi Mixed Oxides

Photocatalytic wet peroxide assisted degradation of Orange II dye by reduced graphene oxide and zeolites

Effects of Erbium Incorporation on Structural, Surface Morphology, and Degradation of Methylene Blue Dye of Magnesium Oxide Nanoparticles

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