Immobilization of semiconductor photocatalysts

Pârvulescu, Viorica; Ciobanu, Mădălina; Petcu, Gabriela

doi:10.1016/b978-0-12-819051-7.00004-x

Cited by 5 publications

(5 citation statements)

References 123 publications

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“…The indirect band gap energies were calculated using the Kubelka–Munk function by plotting [F(R)·hν] 1/2 versus photon energy (eV). The obtained values ( Table 1 ) suggest a decrease in the band gap energy after titanium immobilization compared to bulk TiO 2 (3.2 eV) due to the high dispersion of titania [ 46 , 47 ]. A slight increase in the band gap was obtained by gold immobilization, as a result of plasmonic properties of gold nanoparticles that inject electrons into the conduction band of TiO 2 (Burstein–Moss (BM) effect [ 48 ]).…”

Section: Resultsmentioning

confidence: 99%

“…After this period of time, the significant decrease in AMX concentration can be attributed to the photocatalytic process. In the photocatalytic degradation of AMX, adsorption can be considered a rate-determining step [ 47 ].…”

Section: Resultsmentioning

confidence: 99%

“…It has shown a direct dependence between the photocatalytic process and adsorption capacity ( Figure 14 ), highlighting the importance of providing pollutant molecules on the surface of the photocatalytic material, close to the activated sites under irradiation [ 47 ]. Thus, the photocatalytic properties of the synthesized materials increased with the TiO 2 loading, both under UV and visible light irradiation.…”

Section: Resultsmentioning

confidence: 99%

“…In the case of UV light irradiation, when only TiO2 is activated, the metallic gold species act as etrappers which would imply an improvement of the photocatalytic activity due to the separation of charge carriers [20,61]. However, the photocatalytic per- It has shown a direct dependence between the photocatalytic process and adsorption capacity (Figure 14), highlighting the importance of providing pollutant molecules on the surface of the photocatalytic material, close to the activated sites under irradiation [47]. Thus, the photocatalytic properties of the synthesized materials increased with the TiO 2 loading, both under UV and visible light irradiation.…”

Section: Photocatalytic Activitymentioning

confidence: 99%

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Effects of Aluminosilicate Gel Treatment and TiO2 Loading on Photocatalytic Properties of Au–TiO2/Zeolite Y

Petcu

Papa

Anghel

et al. 2023

Gels

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The present work reports the synthesis of efficient Ti–Au/zeolite Y photocatalysts by different processing of aluminosilicate gel and studies the effect of titania content on the structural, morphological, textural, and optical properties of the materials. The best characteristics of zeolite Y were obtained by aging the synthesis gel in static conditions and mixing the precursors under magnetic stirring. Titania (5, 10, 20%) and gold (1%) species were incorporated in zeolite Y support by the post-synthesis method. The samples were characterized by X-ray diffraction, N2-physisorption, SEM, Raman, UV–Vis and photoluminescence spectroscopy, XPS, H2-TPR, and CO2-TPD. The photocatalyst with the lowest TiO2 loading shows only metallic Au on the outermost surface layer, while a higher content favors the formation of additional species such as: cluster type Au, Au1+, and Au3+. A high TiO2 content contributes to increasing the lifetime of photogenerated charge careers, and the adsorption capacity of the pollutant. Therefore, an increase in the photocatalytic performances (evaluated in degradation of amoxicillin in water under UV and visible light) was evidenced with the titania content. The effect is more significant in visible light due to the surface plasmon resonance (SPR) effect of gold interacting with the supported titania.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Photocatalytic Activitymentioning

confidence: 99%

See 2 more Smart Citations

Effects of Aluminosilicate Gel Treatment and TiO2 Loading on Photocatalytic Properties of Au–TiO2/Zeolite Y

Petcu

Papa

Anghel

et al. 2023

Gels

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“…Another condition is the large energy band gap (3 -3.2 eV), which indicates that the TiO2 photocatalyst can only be active on irradiation using light in the UV spectrum range [5]. Several studies have been conducted to improve the performance of TiO2 in the photocatalyst process, such as by changing the surface morphology capable of increasing the contact area of the immobilized photocatalyst [8][9][10]. Other methods include metal or non-metal doping, dye sensitization, co-catalysts, or coupling with other semiconductors with narrower bandgap energy to form TiO2 nanocomposites [6,11,12].…”

Section: Introductionmentioning

confidence: 99%

Performance of CdS/TNTAs Nanocomposite in Removing Ciprofloxacin and Hydrogen Production using Simultaneously Electrocoagulation-Photocatalysis Process

Sugihartini

Pratiwi

Slamet

2022

Bull. Chem. React. Eng. Catal.

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This study used CdS as a pair of TiO2 Nanotube Arrays (TNTAs), considering the position and width of the energy band gap, which is expected to increase photocatalyst performance. The nancomposite was synthesized using the successive ionic layer adsorption reaction (SILAR) method, with Cd(CH3COO)2 and Na2S as precursors. The CdS/TNTAs nanocomposite is expected to reduce the energy band gap to enable the visible and UV spectrum to activate the photocatalyst. Additionally, the formed heterojunction mechanism provides opportunities for the trajectories of electrons and holes to be farther apart and reduce the recombination rate. The degradation ability of CdS/TNTAs nanocomposite in the photocatalytic process was evaluated using samples of ciprofloxacin liquid waste as an antibiotic, which is quite challenging to decompose completely. The ability of the photocatalytic process to produce hydrogen gas was also observed and its performance synergized with the electrocoagulation process. The result showed that the use of CdS as a TNTAs partner in CdS/TNTAs nanocomposites affects increasing photocatalyst performance, both in degrading ciprofloxacin and producing hydrogen gas. Furthermore, the CdS/TNTAs nanocomposite increased the photocatalytic process’s ability to degrade ciprofloxacin and produce hydrogen from 8.5 to 20.5% and 6 to 23.5 mmol/m2 compared to using TNTAs alone. The processing capability is further enhanced when run in synergy with the electrocoagulation process where the removal of ciprofloxacin reaches 86.55% and the hydrogen produced is 2.62×106 mmol/m2. Copyright © 2022 by Authors, Published by BCREC Group. This is an open access article under the CC BY-SA License (https://creativecommons.org/licenses/by-sa/4.0).

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Investigation of copper plates as anode and TiO2/glycine/ZnFe2O4 stabilized on graphite as cathode for textile dyes degradation from aqueous solution under visible light

et al. 2021

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Immobilization of semiconductor photocatalysts

Cited by 5 publications

References 123 publications

Effects of Aluminosilicate Gel Treatment and TiO2 Loading on Photocatalytic Properties of Au–TiO2/Zeolite Y

Effects of Aluminosilicate Gel Treatment and TiO2 Loading on Photocatalytic Properties of Au–TiO2/Zeolite Y

Performance of CdS/TNTAs Nanocomposite in Removing Ciprofloxacin and Hydrogen Production using Simultaneously Electrocoagulation-Photocatalysis Process

Investigation of copper plates as anode and TiO2/glycine/ZnFe2O4 stabilized on graphite as cathode for textile dyes degradation from aqueous solution under visible light

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