Remarkable photocatalytic activity of Zr doped ZnO and ZrO2/ZnO nanocomposites: Structural, morphological and photoluminescence properties

Wahba, Mohammed Ahmed; Yakout, S.M.; Mohamed, Walied A.A.; Galal, Hoda R.

doi:10.1016/j.matchemphys.2020.123754

Cited by 56 publications

(22 citation statements)

References 37 publications

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“…Therefore, a growing global concern to treat and remove such hazardous has been conducted. Various chemical, biological and physical techniques such as coagulation, flocculation, membrane separation and adsorption have been progressively investigated to remove color and hazardous materials from contaminated water [6][7][8][9][10][11]. The physical adsorption technique is one of the most effective routes for dyes removal and controlling of the biochemical oxygen demand.…”

Section: Introductionmentioning

confidence: 99%

Highly ordered pure and indium-incorporated MCM-41 mesoporous adsorbents: synthesis, characterization and evaluation for dye removal

et al. 2022

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Highly ordered pure MCM-41 and In-MCM-41 mesoporous adsorbents (with Si/In = 95 (IM0.05) and Si/In = 90 (IM0.1)) were synthesized using the hydrothermal-assisted method. The structural, morphological and texture characteristics were investigated by XRD, N2 adsorption–desorption, SEM-EDX, TEM, diffuse reflectance (DR) and FTIR. The broadening XRD diffraction peaks as well as the shifts to higher and lower 2-theta in IM0.05 and IM0.1, respectively, confirmed the incorporation of indium atoms in the MCM-41 structure. SEM-EXD and TEM images showed that pure MCM-41 and IM0.05 preserve a highly long-range well-ordered hexagonal pore structure, on the other hand, high loading of indium (IM0.1) resulted in partially irregular pore-ordering and morphological defects related to a partial dissolution of MCM-41 structure. The infrared spectra of In-incorporated samples showed a decrease in the transmittance intensity of MCM-41 characteristic peaks with little shifts relative to the pure MCM-41 sample. The potential of pure MCM-41 and In-MCM-41 samples for adsorption of dyes was preliminarily investigated. The removal efficiency of both methylene blue and basic yellow-28 (BY28) was enhanced by the incorporation of indium in the MCM-41. The adsorption equilibrium data of BY28 dye on pure, IM0.05 and IM0.1 samples fitted well with Langmuir adsorption model with adsorption capacity of 123.46, 156.99 and 158.48 mg g−1 respectively. The calculated free adsorption energy obtained from D–R isotherm was found to be 26.7 kJ mol−1 referring to that the adsorption of BY28 on IM0.05 adsorbent is chemical. The adsorption kinetic of BY28 on IM0.05 sample followed the pseudo-second-order model. The adsorption experiments revealed that the prepared samples can be used as effective adsorbents for the removal of dyes in aqueous solutions with good recovery and recyclability. Graphical Abstract

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Section: Introductionmentioning

confidence: 99%

Highly ordered pure and indium-incorporated MCM-41 mesoporous adsorbents: synthesis, characterization and evaluation for dye removal

et al. 2022

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“…Recently, the ZnO based nanocomposites received a great attention of addressing these obstacles in an operative manner [19,20]. To clarify, both of the metal oxides semiconductors were instantaneously excited and the electrons slip from the conduction band (CB) of one semiconductor to another while the holes moved to the valence band (VB) in the opposite direction [21][22][23]. These reactions have the ability to separate the electron-hole pairs which in turn enhanced the photocatalytic efficiency [21][22][23].…”

Section: Introductionmentioning

confidence: 99%

“…To clarify, both of the metal oxides semiconductors were instantaneously excited and the electrons slip from the conduction band (CB) of one semiconductor to another while the holes moved to the valence band (VB) in the opposite direction [21][22][23]. These reactions have the ability to separate the electron-hole pairs which in turn enhanced the photocatalytic efficiency [21][22][23]. One of the metal oxide semiconductor materials that improve the photocatalytic properties of ZnO nanoparticles is zirconium oxide (ZrO 2 ) [24][25][26].…”

Section: Introductionmentioning

confidence: 99%

“…The high electron mobility, high thermal conductivity, wide and direct band gap, good transparency, large exciton binding energy and easiness of synthesizing make ZrO 2 /ZnO structure appropriate for a wide range of applications in optoelectronics, transparent electronics, lasing and sensing [28][29][30]. The replacement of Zn 2+ by Zr 4+ or versa vise can disturbs the charge balance in their lattices and the disturbed charge balance contributes to the adsorption of more hydroxide ions (-OH) on the surface of the particles of the powder, which additionally inhibits the recombination of the electron-hole pairs [21]. Congo red (CR) and methylene blue (MB) dyes have aromatic rings in their structures that are resistant to biodegradation and aerobic degradation.…”

Section: Introductionmentioning

confidence: 99%

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Microwave-synthesized ZrO2/ZnO heterostructures: fast and high charge separation solar catalysts for dyes-waste degradation

Wahba

Yakout

2022

J Sol-Gel Sci Technol

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In 60 min, microwave-synthesized ZrO2/ZnO heterostructures exhibited high and fast sunlight photodegradation efficiencies for 50 ppm Congo red (CR) and 50 ppm methylene blue (MB) pollutants. ZrO2/ZnO heterostructures were characterized by XRD, SEM, EDX, FTIR, and diffuse reflectance (DR) techniques. The XRD analysis showed that these heterostructures have combined components of tetragonal ZrO2 and hexagonal ZnO phases. The SEM micrographs of all ZrO2/ZnO nanocomposites demonstrate the formation of nanospherical particles (major) and rod-like (minor) structures. The EDX spectra verified the presence of Zr, Zn and O elements with percentage ratios equivalent or close to that used during the experimental preparation. The FT-IR spectra showed the vibrational characteristic absorption modes of ZrO2 and ZnO bonds around 400–600 cm−1. Two band gap energies were estimated corresponding to ZrO2 (5.05–5.16 eV) and ZnO (3.1–3.16 eV) components. Remarkably, in presence of ZrO2/ZnO (30/70 at%) heterostructure, the free solar energy initiated photodegradation efficiencies of 87% and 98% for 50 ppm CR and 50 ppm MB dyes after 60 min, respectively, which indicates the fast and superior photocatalytic activity of microwave-synthesized ZrO2/ZnO heterostructure. As well, this composition reveals good reusability and stability for three photocatalytic cycles. This uppermost photodegradation performance can be assigned to the high separation of charge carriers, especially for the ZrO2/ZnO (30/70 at%) nanocomposite.

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“…Additionally, these compounds can break down different types of pollutants under Ultra-Violet light. As a nano-heterogeneous catalyst, nano zinc oxide with a wide band gap (3.37 eV) at room temperature is considered the most efficient photocatalyst for water splitting, wastewater treatment, and photodegradation of organic dyes [ 4 , 5 , 6 , 7 , 8 , 9 , 10 , 11 ].…”

Section: Introductionmentioning

confidence: 99%

Remarkable Recycling Process of ZnO Quantum Dots for Photodegradation of Reactive Yellow Dye and Solar Photocatalytic Treatment Process of Industrial Wastewater

et al. 2022

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The mineralization of five industrial sunlight-exposed wastewater samples was investigated, and the recycling process of ZnO quantum dots (ZQDs) for five reusable times was estimated under the approved Egyptian Environmental Law COD (Chemical Oxygen Demand), which has to be less than 1000 ppm. An improved sol-gel process at a low calcination temperature that ranged between 350 and 450 °C was employed to synthesize ZnO quantum dots (ZQDs). The purity, high crystallinity, and structure of the prepared catalysts were determined by TEM and XRD analysis. The energy bandgap, the crystal size values, and the surface area for Z1 and Z2 were determined based on the TEMs, DRSs, and EBTs, which were equal to 6.9 nm, 3.49 eV, and 160.95 m2/g for Z1 and 8.3 nm, 3.44 eV, and 122.15 m2/g for Z2. The investigation of the prepared samples was carried out by studying the photocatalytic activity and photoluminescence, and it was found that the degradation rate of reactive yellow dye as an industrial pollutant of the Z1 sample was significantly higher than other samples, by 20%. The data collection has shown that photocatalytic efficiency decreases with an increase in the crystallite size of ZQDs.

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Remarkable photocatalytic activity of Zr doped ZnO and ZrO2/ZnO nanocomposites: Structural, morphological and photoluminescence properties

Cited by 56 publications

References 37 publications

Highly ordered pure and indium-incorporated MCM-41 mesoporous adsorbents: synthesis, characterization and evaluation for dye removal

Highly ordered pure and indium-incorporated MCM-41 mesoporous adsorbents: synthesis, characterization and evaluation for dye removal

Microwave-synthesized ZrO2/ZnO heterostructures: fast and high charge separation solar catalysts for dyes-waste degradation

Remarkable Recycling Process of ZnO Quantum Dots for Photodegradation of Reactive Yellow Dye and Solar Photocatalytic Treatment Process of Industrial Wastewater

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