Electron transfer in ZnO–Fe<sub>2</sub>O<sub>3</sub>aqueous slurry systems and its effects on visible light photocatalytic activity

Lachheb, Hinda; Ajala, F.; Hamrouni, Abdessalem; Houas, Ammar; Parrino, Francesco; Palmisano, Leonardo

doi:10.1039/c7cy01085k

Cited by 40 publications

(47 citation statements)

References 30 publications

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“…Therefore, the photocatalytic activity increased with increasing Al content reaching a maximum for the 1.0% A-ZnO sample and then decreased at higher Al concentrations, being for the 1.5% A-ZnO sample even less than for the bare ZnO. Similar behavior is reported for other ZnO based systems [30][31][32][33]. Fig.…”

Section: Resultssupporting

confidence: 78%

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The influence of Al doping on the photocatalytic activity of nanostructured ZnO: The role of adsorbed water

Ajala

Hamrouni

Houas

et al. 2018

Applied Surface Science

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Section: Resultssupporting

confidence: 78%

“…The band gap energy of ZnO is 3.21 eV in agreement with the relevant literature [30][31][32][33]. Increasing the Al content in the powders results in a slight blue shift of the absorption edge.…”

Section: Opto-electronic Characterizationsupporting

confidence: 89%

The influence of Al doping on the photocatalytic activity of nanostructured ZnO: The role of adsorbed water

Ajala

Hamrouni

Houas

et al. 2018

Applied Surface Science

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“…The non-shifting of band position may also indicate the absence of any structural distortion on ZnO attributed to Fe 3+ or Mn 3+ ion inclusion [23]. Compared to the ternary PVA-TMOP1, the sharpness of the peaks for ZnO synthesized without PVA show its high crystallinity.…”

Section: Resultsmentioning

confidence: 99%

Porous PVA/Zn–Fe–Mn oxide nanocomposites: methylene blue dye adsorption studies

Abebe

Murthy

Zereffa

et al. 2020

Mater. Res. Express

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Adsorption is one of the noble techniques for remediation of organic and inorganic pollutants. The poly (vinyl alcohol) supported sol-gel and self-propagation routes have been used for the synthesis of porous ternary metal oxides nanocomposites. The optical, chemical bonding, crystallinity, morphological, textural, and electrochemical properties of the synthesized materials were characterized by DRS-UV-vis, FT-IR, XRD, SEM/EDX and TEM/HRTEM/SAED, BET, and CV/EIS techniques, respectively. The characterization of the nanocomposites confirmed their porous nature, high surface area, and better electrochemical properties. The synthesized nanomaterials were tested for the adsorption property of methylene blue dye. Important parameters such as the amount of PVA supported ternary metal oxide nanocomposite, pH of the solution, contact time, and concentration of methylene blue dye were optimized. For further understanding of the adsorption process, the adsorption isotherms and adsorption kinetics models were used. The adsorption tests revealed the presence of the chemisorption type of the adsorption process. several advantageous properties [8,9]. Besides, its hydroxyl groups on the carbon chain backbone act as a source for the formation of hydrogen bonding and enhances the formation of the nanocomposite [10]. As confirmed by various researchers [11][12][13][14][15][16], around 250, 300, 390, 400, and 400°C-500°C; the intramolecular decomposition, amorphous portion degradation, intermolecular breakdown, decaying of the crystalline portion of PVA, and formation of pure metal oxides had occurred, respectively.From methods used for the synthesis of inorganic nanomaterials/nanocomposites, the top-down and bottom-up approaches are common. Compared to the former, the latter is more popular and is considered as a promising route to control the growth, morphology, and properties of the nanomaterials. From the bottom-up chemical approaches; the hydrothermal, microemulsion, wet impregnation, sonochemical, ultrasonicmicrowave, electrochemical/electroless deposition, and spray-pyrolysis techniques are successfully applied. However, it is reported that these techniques follow special operating-conditions, long reaction time, lowthrough-put, and expensive procedure [17]. Therefore, it is essential to use effective and economically feasible methods such as sol-gel, precipitation, and impregnation. Furthermore, during the synthesis process, avoiding solvents that cause cancer and has mutagenic properties should also be taken into consideration [18].Considering all the mentioned aspects, this work was aimed to synthesize PVA supported ternary metal oxide nanocomposite (PVA-TMONC), using a simple and green sol-gel-self propagation technique. The methylene blue dye (MBD) adsorption efficiency of the synthesized PVA-TMONC was also tested. The physical properties of synthesized materials were characterized by critical analytical techniques. Using the Langmuir, Freundlich, Dubinin-Radushkevich (D-RK), Temkin, Flory-Huggins (FH), and Fowler-Gugge...

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“…In fact, interaction of the organic substrate with the small particles is more intense than that of the organic substrate with the bigger particles, so that an extended alterationo ft he electronic structure is obtained.As imilara bsorptionb and shift is reported for solid solutionso fs trongly interacting semiconductors. [71]…”

Section: Influence On the Dynamics Of Photogenerated Chargesmentioning

confidence: 99%

Influence of Surface‐Related Phenomena on Mechanism, Selectivity, and Conversion of TiO₂‐Induced Photocatalytic Reactions

2018

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Heterogeneous photocatalysis is the result of an inextricable connection of several factors differently contributing to the overall process. Photon absorption is the “sine qua non” condition for the reaction to occur. In fact, photons can be considered as immaterial reactants, and all of the phenomena related to the interaction of light–matter play a prominent role. However, other factors contribute in a concerted way to address the reaction, so that the relative contribution of each of them is often difficult to evaluate. In this framework, the present paper highlights some aspects of the interaction of TiO2 surface‐adsorbate species that could be underestimated and their influence on the conversion, selectivity, and mechanisms of photocatalytic reactions. To this aim, some paradigmatic examples on the adsorption of water and organics on TiO2 are reported.

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Electron transfer in ZnO–Fe₂O₃aqueous slurry systems and its effects on visible light photocatalytic activity

Abstract: The strong interactions between ZnO and Fe2O3 modify the nanocomposite's electronic structure producing efficient charge separation and superior photoactivity.

Cited by 40 publications

References 30 publications

The influence of Al doping on the photocatalytic activity of nanostructured ZnO: The role of adsorbed water

The influence of Al doping on the photocatalytic activity of nanostructured ZnO: The role of adsorbed water

Porous PVA/Zn–Fe–Mn oxide nanocomposites: methylene blue dye adsorption studies

Influence of Surface‐Related Phenomena on Mechanism, Selectivity, and Conversion of TiO₂‐Induced Photocatalytic Reactions

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Electron transfer in ZnO–Fe2O3aqueous slurry systems and its effects on visible light photocatalytic activity

Abstract: The strong interactions between ZnO and Fe2O3 modify the nanocomposite's electronic structure producing efficient charge separation and superior photoactivity.

Cited by 40 publications

References 30 publications

The influence of Al doping on the photocatalytic activity of nanostructured ZnO: The role of adsorbed water

The influence of Al doping on the photocatalytic activity of nanostructured ZnO: The role of adsorbed water

Porous PVA/Zn–Fe–Mn oxide nanocomposites: methylene blue dye adsorption studies

Influence of Surface‐Related Phenomena on Mechanism, Selectivity, and Conversion of TiO2‐Induced Photocatalytic Reactions

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Product

Resources

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Electron transfer in ZnO–Fe₂O₃aqueous slurry systems and its effects on visible light photocatalytic activity

Influence of Surface‐Related Phenomena on Mechanism, Selectivity, and Conversion of TiO₂‐Induced Photocatalytic Reactions