Removal of tartrazine, ponceau 4R and patent blue V hazardous food dyes from aqueous solutions with ZnAl-LDH/PVA nanocomposite

Balayeva, Ofeliya O.; Azizov, Abdulsaid A.; Muradov, M. B.; Alosmanov, Rasim

doi:10.1080/01932691.2021.2006688

Cited by 14 publications

(9 citation statements)

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“…[2] ZnAl-LDH/PVA nanocomposite is also stable at phases. [6] During the formation of LDHs with PVA, zinc oxide (ZnO) and zinc hydroxides Zn(OH) 2 also crystallized in the nanocomposite along with ZnAl-LDH. The main reason for this is the different crystallization rates of nanocrystals and the effect of the high concentration of the base solution.…”

Section: Photocatalytic Activity Testmentioning

confidence: 99%

“…The acceleration of decomposition is also explained by the fact that the released polar molecules absorb light and emit it into a nearby catalyst. The mechanism of P4R sorption (13) and photodegradation (14-26) process can be described as follow [6,[48][49][50][51][52] :…”

Section: The Kinetics Of Photocatalytic Degradationmentioning

confidence: 99%

“…[3,4] The band gap values indicate the gaps determined for all the semiconductors that exist in the visible-light region; hence, they can be applied in photocatalysis. [5] Zinc containing layered double hydroxides [6][7][8] oxides [9][10][11][12] sulfides [13][14][15] and other semiconductors [16] are very effective photocatalysts with unique optical properties. It is important for electrons to move from the valence band (VB) to the conduction band (CB) under less energy irradiation.…”

Section: Introductionmentioning

confidence: 99%

“…,34 0,021 0,001 0,12 1,349 0,63 0,465 5,282 0,65 0,52 0,2 13,52 0,90 ZnAl-LDH/PVA [6] 16,13 0,102 0,094* 0,73 1,765 0,91 8,17 0,16 0,91 0,81 0,78 7,66 0,89*a new result that is not in the reference[6].…”

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

Balayeva

2022

J Chinese Chemical Soc

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In this work, zinc-aluminum layered double hydroxides were synthesized with and without the presence of polyvinyl alcohol by co-formation and co-precipitation methods, respectively. The photocatalytic activity of the obtained nanocomposites was studied and a comparative analysis was performed. The mechanism of photocatalytic decomposition of Ponceau 4R (P4R) on the nanocomposites has been explained in detail by relating it to the compositional and structural properties of the nanocomposite. The structural and optical properties of nanocomposites are characterized by XRD, UV-vis, PL, and SEM in a pure state, dye loaded and after photodegradation. The bandgap of nanocomposites (E g = 3,23 eV) was reduced after sorption (E g = 3,1 eV) and photocatalytic degradation (E g = 2,87 eV) of P4R. This result is in good agreement with basal spacing determined by XRD. To study the sunlight degradation of P4R at different initial concentrations (8,12,16,20,30,40, 50 mg L À1 ), firstly sorption was developed with Langmuir and other isothermal models. The Langmuir constant value (K L = 0,102) of ZnAl-LDH/PVA is close to the Langmuir-Hinshelwood constant (K L-H = 0,094) obtained from the kinetics of the photodegradation in sunlight. The photocatalytic degradation of P4R onto the obtained nanocomposites follows the Langmuir-Hinshelwood kinetic model.

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Section: Photocatalytic Activity Testmentioning

confidence: 99%

Section: The Kinetics Of Photocatalytic Degradationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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

Balayeva

2022

J Chinese Chemical Soc

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“…As can be seen, element doping is one of the most important modification methods applied to change the physical, chemical, mechanical, and biological properties of LDHs, which are obviously very important [73][74][75]. Dopping of the above-mentioned elements and substances to LDHs has been applied in the literature by various methods [42,76].…”

Section: Carbon Nanotubes (Cnt)-doped Ldhs Cnt/ldhmentioning

confidence: 99%

Synthesis, Properties and Practical Applications of Doped and Undoped, Zinc-Containing Layered Double Hydroxides – A Brief Review

Balayeva

2022

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Recently, layered double hydroxides (LDHs) have been developed for more potential applications in various industry fields. Many synthesis methods of LDHs in the literature have been considered and classified by changing properties. However, the property change by the synthesis method does not happen in the same way in all LDHs. Also, when LDH with the same composition is synthesized by the same synthesis method, it is possible to obtain LDHs with the same composition but different properties due to the change of reaction parameters. Recently, the doping of semiconductor nanocomposites with different element atoms has led to new properties. The effect of the elements used in the doping process on the properties of zinc-containing LDHs was investigated and explained in the review article. The synthesis's techniques differ from each other by the reaction parameters and they impact the crystal structure, physicochemical properties, and morphology of LDHs. Finding more additional effects of doping processes and doping elements' nature on the zinc-containing LDHs' properties, the synthesis procedures, and the determination of reaction parameters are shown in this review article. It was revealed that rare earth elements are not selected as three valence metals for the main structure of LDHs, they are mainly used as a doping element which is replaced by three valence metals (Al, Cr, Ti, Fe(III)) as dopants because of the ionic radius and various factors.

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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

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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Removal of tartrazine, ponceau 4R and patent blue V hazardous food dyes from aqueous solutions with ZnAl-LDH/PVA nanocomposite

Cited by 14 publications

References 46 publications

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

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

Synthesis, Properties and Practical Applications of Doped and Undoped, Zinc-Containing Layered Double Hydroxides – A Brief Review

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

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Removal of tartrazine, ponceau 4R and patent blue V hazardous food dyes from aqueous solutions with ZnAl-LDH/PVA nanocomposite

Cited by 14 publications

References 46 publications

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

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

Synthesis, Properties and Practical Applications of Doped and Undoped, Zinc-Containing Layered Double Hydroxides – A Brief Review

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

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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