Physicochemical properties and photocatalytic activity in the 2-propanol degradation of transition metals (Zr, Zn or Nb) doped TiO2 solids

Jedidi, Wiem; Arfaoui, Jihène; Caudillo-Flores, Uriel; Muñoz‐Batista, Mario J.; Ksibi, Zouhaier; Kubacka, Anna; Ghorbel, Abdelhamid; Fernández, M.

doi:10.1016/j.mseb.2022.116034

Cited by 6 publications

(3 citation statements)

References 95 publications

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“…While powder photocatalysts are more efficient in pollutant removal, due to their larger specific surface, they are much more difficult to separate from water and, therefore, to reuse. For the Nb-doped titania, very good removal efficiencies for 2-propanol have been reported under UV irradiation, but this is not maintained under sunlight-type radiation [72]. This suggests that Vis-activation did not take place in this case.…”

Section: Photocatalytic Propertiesmentioning

confidence: 94%

Sol-Gel Multilayered Niobium (Vanadium)-Doped TiO2 for CO Sensing and Photocatalytic Degradation of Methylene Blue

Simeonov,

Szekeres,

Covei

et al. 2024

Materials

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Multilayered TiO2 films doped either with Niobium or Vanadium (1.2 at. %) were deposited by the sol-gel dip coating method on c-Si and glass substrates. The films on glass substrates were tested for CO sensing and photocatalytic degradation of methylene blue. X-ray diffraction data analysis showed that all the TiO2:Nb(V) films were nanocrystalline in the anatase phase, with a uniform and compact microstructure and a homogeneous superficial structure of small grains with diameters in the range of 13–19 nm. For the electrical characterization, the TiO2:Nb(V) films were incorporated in Metal-Insulator-Semiconductor (MIS) structures. The specific resistivity is of the order of 104 Ωcm and its value decreases with increasing the electrical field, which testifies to the injection of electrons into these layers. From the analysis of the current–voltage curves taken at different temperature- and frequency—dependent capacitance–voltage and conductance–voltage characteristics, the density and parameters of deep levels in these TiO2 films are evaluated and the electron charge transport mechanism is established. It was shown that the current in these TiO2:Nb(V)-Si MIS structures is mainly carried out by inter-trap tunneling via deep levels energetically distributed in the TiO2 bandgap. Testing these sol-gel TiO2:Nb(V) layers for gas sensing and photocatalytic capabilities proved that they could serve such purposes. In particular, the results of the V-doped sol-gel TiO2 film confirm its CO detection capability, which is rarely reported in the literature. For the photodegradation of methylene blue, the Nb-doped TiO2 samples were superior, with nearly double the photocatalytic efficiency of undoped TiO2.

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Section: Photocatalytic Propertiesmentioning

confidence: 94%

Sol-Gel Multilayered Niobium (Vanadium)-Doped TiO2 for CO Sensing and Photocatalytic Degradation of Methylene Blue

Simeonov,

Szekeres,

Covei

et al. 2024

Materials

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“…7,8 To overcome these limitations, considerable research has concentrated on enhancing TiO 2 efficiency through metal impregnation. [9][10][11][12][13] In previous studies, both bismuth (Bi) and zinc (Zn) have been individually and in combination with other metals used as dopants to improve the performance of TiO 2 . 11,[14][15][16][17] These upgraded materials demonstrated improved performance under visible and UV light as compared with pristine TiO 2 .…”

Section: Introductionmentioning

confidence: 99%

“…However, TiO 2 exhibits limited quantum efficiency due to fast charge recombination, leading to low photocatalytic performance 7,8 . To overcome these limitations, considerable research has concentrated on enhancing TiO 2 efficiency through metal impregnation 9‐13 . In previous studies, both bismuth (Bi) and zinc (Zn) have been individually and in combination with other metals used as dopants to improve the performance of TiO 2 11,14‐17 .…”

Section: Introductionmentioning

confidence: 99%

Performance evaluation of Bi/Zn‐impregnated commercial TiO₂ nanoparticles for photocatalytic nitrobenzene decomposition

Mishra,

Chakinala,

Chakinala

et al. 2024

J of Chemical Tech & Biotech

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BACKGROUNDCommercial TiO2 nanoparticles were subjected to modification through Bi and Zn metal doping. The resulting catalysts were comprehensively characterized, and their performance was then reviewed for removal of model pollutant nitrobenzene in water.RESULTSAmidst the synthesized catalysts, the co‐doping of Bi/Zn (0.25:0.75 wt%) demonstrated the best photocatalytic degradation activity, achieving 95% degradation within 90 min of reaction time, with 2.99 × 10−2 min−1 rate constant value. The involvement of different radicals during the degradation process was elucidated by employing appropriate radical scavengers. Furthermore, the degradation results were investigated applying the first‐order kinetic model, leading to the determination of reaction rate constants and initial rates of the degradation process.CONCLUSIONAn improved photocatalytic activity was observed with metal doping due to the synergistic effect of doped metals with commercial TiO2 and profound charge transfer among them. It was observed that performance was increased with temperature rise in the practical range of application, that is, 5–20 °C. This behavior was due to high rate of movement of charge carriers. Further, involvement and functioning of various radical species such as h+, OH− and O2− in nitrobenzene degradation were successfully established using appropriate radical scavengers. © 2024 Society of Chemical Industry (SCI).

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A universal polymer-assisted route to fabricate Zr-doped TiO2 nanocomposite: boosting reactive desulfurization

Du,

Li,

Zhong

et al. 2024

Tungsten

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Physicochemical properties and photocatalytic activity in the 2-propanol degradation of transition metals (Zr, Zn or Nb) doped TiO2 solids

Cited by 6 publications

References 95 publications

Sol-Gel Multilayered Niobium (Vanadium)-Doped TiO2 for CO Sensing and Photocatalytic Degradation of Methylene Blue

Sol-Gel Multilayered Niobium (Vanadium)-Doped TiO2 for CO Sensing and Photocatalytic Degradation of Methylene Blue

Performance evaluation of Bi/Zn‐impregnated commercial TiO₂ nanoparticles for photocatalytic nitrobenzene decomposition

A universal polymer-assisted route to fabricate Zr-doped TiO2 nanocomposite: boosting reactive desulfurization

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Physicochemical properties and photocatalytic activity in the 2-propanol degradation of transition metals (Zr, Zn or Nb) doped TiO2 solids

Cited by 6 publications

References 95 publications

Sol-Gel Multilayered Niobium (Vanadium)-Doped TiO2 for CO Sensing and Photocatalytic Degradation of Methylene Blue

Sol-Gel Multilayered Niobium (Vanadium)-Doped TiO2 for CO Sensing and Photocatalytic Degradation of Methylene Blue

Performance evaluation of Bi/Zn‐impregnated commercial TiO2 nanoparticles for photocatalytic nitrobenzene decomposition

A universal polymer-assisted route to fabricate Zr-doped TiO2 nanocomposite: boosting reactive desulfurization

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Performance evaluation of Bi/Zn‐impregnated commercial TiO₂ nanoparticles for photocatalytic nitrobenzene decomposition