Photocatalytic degradation of Ponceau <scp>4R</scp> by <scp>ZnAl</scp>‐layered double hydroxide nanostructures obtained with and without polyvinyl alcohol

Balayeva, Ofeliya O.

doi:10.1002/jccs.202200121

Cited by 7 publications

(3 citation statements)

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“…XRD patterns of ZnAl-LDH/PVA is presented at Figure 4. According to literature, the shift of diffraction peak to the right occurs by transverse bonds formation in PVA and crystal lattice compression [46][47][48]. The characteristic diffraction peak of PVA at 2Ɵ =19.17 0 diffraction angle [49] shift to 2Ɵ=20 0 upon the formation of LDH is related by the cross-linking of PVA by ZnAl -LDH [48].…”

Section: Resultsmentioning

confidence: 90%

SYNTHESIS OF ZnAl-LDH/PVA NANOCOMPOSITE AND ADSORPTION OF PATENT BLUE V FOOD DYE FROM WATER SOLUTION

Balayeva¹,

Azizov²,

Muradov³

et al. 2023

AChJ

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In the presented research work, zinc and aluminum containing layered double hydroxides on the polyvinyl alcohol matrix (ZnAl LDH/PVA) were prepared by the co-formation technique and characterized by X-ray diffractometer, Brunauer-Emmett-Teller (BET) and Ultraviolet-visible (UV-Vis) spectroscopy. Both low and high pH is determined as optimal pH for Patent Blue V (PBV) adsorption on the ZnAl LDH/PVA nanocomposite and it is explained by the fact that the dye molecule is zwitterionic. Sorption of Patent Blue V food additive (E 131) on the obtained nanocomposite was studied by Temkin, Freundlich, Langmuir, and Dubinin-Radushkevich (D-R) isotherm models. Based on the obtained isotherm curves, the adsorption of PBV more closely matches Temkin model. The regenerated nanocomposite shows higher adsorption because the specific surface area increased from 5m2 g-1 to 8.94 m2 g-1 by BET analysis

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Section: Resultsmentioning

confidence: 90%

SYNTHESIS OF ZnAl-LDH/PVA NANOCOMPOSITE AND ADSORPTION OF PATENT BLUE V FOOD DYE FROM WATER SOLUTION

Balayeva¹,

Azizov²,

Muradov³

et al. 2023

AChJ

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“…The removal degrees of the photodegradation of MB are 65.16%, 55.57%, 53.31%, and 58.56% after 180 min, respectively. The photocatalytic degradation mechanism can be described as following reactions (20-32) [52][53][54][55][56][57][58] and schematic illustration (Figure 8).…”

Section: Photocatalytic Properties Of C 6 0 @Znal-ldh/pvamentioning

confidence: 99%

C_{60} @ ZnAl goodbreak- LDH / PVA goodbreak+ C_{16} H_{18} {ClN}_{3} normalS \to physical adsorption .

C_{60} @ ZnAl goodbreak- LDH / PVA goodbreak+ italichν \to C_{60} @ ZnAl goodbreak- LDH / PVA ((), e^{-} goodbreak+ h^{+}) .

{normalH}_{2} O + {normalh}^{+} \to \cdot OH + {normalH}^{+} .

{2H}_{2} O + {2h}^{+} \to {normalH}_{2} {normalO}_{2} + {2H}^{+} .

{normalH}_{2} {normalO}_{2} + hν \to 2 \cdot OH .

{normalh}^{+} + {OH}^{-} \to \cdot OH .

{normalO}_{2} + {normale}^{-} \to {O_{2}}^{- •} .

…”

Section: Photocatalytic Properties Of C60@znal‐ldh/pvamentioning

confidence: 99%

Fullerene (C₆₀)‐doped zinc‐aluminium layered double hydroxide/polyvinyl alcohol nanocomposites: Synthesis, characterization, and photodegradation of methylene blue from water solution

Balayeva,

Israfilli,

Azizov

2023

J Chinese Chemical Soc

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IntroductionLayered double hydroxides (LDHs) are widely studied anionite clays consisting of positively‐charged hydroxide nanosheets which is described by the general formula: [M(II)1−xM(III)x(OH)2][An−·mH2O], where M(II) and M(III) are the divalent (e.g., Mg2+, Zn2+, Ca2+, Co2+, Ni2+, etc.) and trivalent (e.g., Al3+, Fe3+, Cr3+, etc.) metal ions, An− and H2O is the interlamellar anion (e.g., Cl¯, Br¯, NO3¯, CO32¯, SO42¯, SeO42¯) for charge‐neutralization and hydrated state, respectively. They have been widely used in different industry sectors, in materials science and research. Polymer/LDH nanocomposites have gained significant attention in recent years.Carbon‐based nanomaterials, like fullerene, carbon nanotubes (CNT), graphene and graphene oxide have attracted significant attention. Fullerene molecules (C60, C70) are used as reinforcing material for polymers to improve their mechanical, thermal, optical, energy storage and charge transport properties.ObjectivesC60‐doped ZnAl‐layered double hydroxide/polyvinyl alcohol nanocomposites were successfully synthesized and their photocatalytic activity for photodegradation of methylene blue (MB) synthetic dye was quantitatively analyzed by ultraviolet (UV) spectroscopy. The effect of C60 on the optical, structural, morphological properties, and photocatalytic activity of LDHs was investigated, and the impact of C60/LDH mass ratio and aging time on the properties was also studied.MethodsFullerene‐doped ZnAl‐LDH/PVA nanocomposites were synthesized via urea hydrolysis and coprecipitation‐coformation method. First, 10 wt% PVA/water solution (40 mL) is added into the mixed solution containing 0.015 mol of Zn(NO3)2·6H2O and 0.005 mol of Al2(SO4)3·9H2O and titrated by 2 M of NaOH and 1 M of NaHCO3 mixed base solution to adjust pH 9. The obtained white slurry was shaken very hard and aged for 1 year. The obtained samples were marked by the mass percentage of C60 as 1% C60@LDH/PVA, 10% C60@LDH/PVA, 20% C60@LDH/PVA, and 60% C60@LDH/PVA.Results and DiscussionThe basal spacing of C60‐doped ZnAl‐LDH was estimated to be 9.217 Å which is wide enough from the general LDH (~7.0 Å). The crystallite size of nanoparticles is 9.217 nm and ~6 nm by Scherrer's equation and Williamson–Hall method from the XRD data, respectively. Rice‐shaped 2D morphology was formed with 100 nm–2 μm width and 500 nm–10 μm in length by SEM. The maximal photodegradation efficiency was found with 20% of C60 doping (PD% = 96.98) after 360 min, where the sorption efficiency with this compound is very high (R% = 85.55).ConclusionsIn the presented work, the effect of C60 on the optical, structural, morphological properties, and photocatalytic activity of LDHs was investigated, and the impact of C60/LDH mass ratio and aging time on the properties was also studied. For the identification of the photocatalytic activity of obtained C60/LDH nanocomposites, MB was used as a model pollutant and the efficiency of the Zn/Al LDH nanocomposite, with various quantities of fullerene, is also evaluated.

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Over 19% Efficient Inverted Organic Photovoltaics Featuring a Molecularly Doped Metal Oxide Electron‐Transporting Layer

Nugraha,

Ling,

Aniés

et al. 2024

Advanced Materials

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Molecular doping is commonly utilized to tune the charge transport properties of organic semiconductors. However, applying this technique to electrically dope inorganic materials like metal oxide semiconductors is challenging due to the limited availability of molecules with suitable energy levels and processing characteristics. Herein, n‐type doping of zinc oxide (ZnO) films is demonstrated using 1,3‐dimethylimidazolium‐2‐carboxylate (CO2‐DMI), a thermally activated organic n‐type dopant. Adding CO2‐DMI into the ZnO precursor solution and processing it atop a predeposited indium oxide (InOx) layer yield InOx/n‐ZnO heterojunctions with increased electron field‐effect mobility of 32.6 cm2 V−1 s−1 compared to 18.5 cm2 V−1 s−1 for the pristine InOx/ZnO bilayer. The improved electron transport originates from the ZnO's enhanced crystallinity, reduced hydroxyl concentrations, and fewer oxygen vacancy groups upon doping. Applying the optimally doped InOx/n‐ZnO heterojunctions as the electron‐transporting layers (ETLs) in organic photovoltaics (OPVs) yields cells with improved power conversion efficiency of 19.06%, up from 18.3% for devices with pristine ZnO, and 18.2% for devices featuring the undoped InOx/ZnO ETL. It is shown that the all‐around improved OPV performance originates from synergistic effects associated with CO2‐DMI doping of the thermally grown ZnO, highlighting its potential as an electronic dopant for ZnO and potentially other metal oxides.

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Photocatalytic degradation of Ponceau 4R by ZnAl‐layered double hydroxide nanostructures obtained with and without polyvinyl alcohol

Cited by 7 publications

References 51 publications

SYNTHESIS OF ZnAl-LDH/PVA NANOCOMPOSITE AND ADSORPTION OF PATENT BLUE V FOOD DYE FROM WATER SOLUTION

SYNTHESIS OF ZnAl-LDH/PVA NANOCOMPOSITE AND ADSORPTION OF PATENT BLUE V FOOD DYE FROM WATER SOLUTION

Fullerene (C₆₀)‐doped zinc‐aluminium layered double hydroxide/polyvinyl alcohol nanocomposites: Synthesis, characterization, and photodegradation of methylene blue from water solution

Over 19% Efficient Inverted Organic Photovoltaics Featuring a Molecularly Doped Metal Oxide Electron‐Transporting Layer

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Photocatalytic degradation of Ponceau 4R by ZnAl‐layered double hydroxide nanostructures obtained with and without polyvinyl alcohol

Cited by 7 publications

References 51 publications

SYNTHESIS OF ZnAl-LDH/PVA NANOCOMPOSITE AND ADSORPTION OF PATENT BLUE V FOOD DYE FROM WATER SOLUTION

SYNTHESIS OF ZnAl-LDH/PVA NANOCOMPOSITE AND ADSORPTION OF PATENT BLUE V FOOD DYE FROM WATER SOLUTION

Fullerene (C60)‐doped zinc‐aluminium layered double hydroxide/polyvinyl alcohol nanocomposites: Synthesis, characterization, and photodegradation of methylene blue from water solution

Over 19% Efficient Inverted Organic Photovoltaics Featuring a Molecularly Doped Metal Oxide Electron‐Transporting Layer

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Fullerene (C₆₀)‐doped zinc‐aluminium layered double hydroxide/polyvinyl alcohol nanocomposites: Synthesis, characterization, and photodegradation of methylene blue from water solution