Brij 58–activated carbon assisted synthesis of Ag/Ag2O/TiO2-AC photocatalysts for efficient organic pollutants degradation

Negoescu, Daniela; Atkinson, Irina; Gherendi, M.; Culiţă, Daniela C.; Băran, Adriana; Petrescu, Simona; Trică, Bogdan; Pelinescu, Diana; Ionescu, Robertina; Brătan, Veronica; Pârvulescu, Viorica

doi:10.1016/j.jallcom.2022.167528

Cited by 12 publications

(7 citation statements)

References 61 publications

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Section: Optical Properties 231 Uv-vis Spectroscopymentioning

confidence: 95%

“…The recorded PL spectra of Ti-zeolite Y and Fe/Co/Ni-modified Ti-zeolite Y, using an excitation wavelength of 320 nm are shown in Figure 12. Ti-zeolite Y materials with different amounts of TiO2 display two clear PL emissions peaks related to the indirect band-to-band recombination of photo-generated electron-hole pairs (in the high energy range) [62] and to the self-trapped excitons (STE) formed by electrons binding to the oxygen vacancies and defects, respectively (in the low energy range) [60,62,63]. Modification of aluminosilicate gel containing titanium in the network with oxides of 3d metals from VIII group leads to obtaining three obvious PL signals at about 415, 485, and 575 nm, respectively.…”

Section: Optical Properties 231 Uv-vis Spectroscopymentioning

confidence: 99%

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Composite Photocatalysts with Fe, Co, Ni Oxides on Supports with Tetracoordinated Ti Embedded into Aluminosilicate Gel during Zeolite Y Synthesis

Petcu,

Anghel,

Atkinson

et al. 2023

Preprint

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Ti-aluminosilicate gels were used as supports for immobilization of Fe, Co and Ni oxides (5%) by impregnation, and synthesis of efficient photocatalysts in degradation of β-lactam antibiotic from water. Titanium oxide (1 and 2%) was incorporated into zeolite network by modifying the gel during the zeolitation process. The formation of the zeolite Y structure and its microporous structure were evidenced by X-ray diffraction and N2 physisorption. The structure, composition, reduction and optical properties were studied by X-ray difraction, H2-TPR, XPS, Raman, photoluminiscence and UV-Vis spectroscopy. The obtained results indicated a zeolite Y structure for all photocatalysts with tetra-coordinate Ti4+ sites. The immobilized metals from group VIII are both in the form of metal oxides such as Fe2O3, Fe3O4, CoO, Co3O4 , NiO and also in the me-tallic state (Fe0, Co0, and Ni0). A red shift of the absorption edge was observed in UV-Vis spectra of photocatalysts upon addition of Fe, Co or Ni species. The photocatalytic performances were evaluated in degradation of cefuroxime from water under visible light irradiation. The best results were obtained for iron immobilized photocatalysts. Scavenger experiments explained the photocatalytic results and their mechanisms. A different contribution of the active species to the photocatalytic reactions was evidenced.

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Section: Optical Properties 231 Uv-vis Spectroscopymentioning

confidence: 95%

Section: Optical Properties 231 Uv-vis Spectroscopymentioning

confidence: 99%

Composite Photocatalysts with Fe, Co, Ni Oxides on Supports with Tetracoordinated Ti Embedded into Aluminosilicate Gel during Zeolite Y Synthesis

Petcu,

Anghel,

Atkinson

et al. 2023

Preprint

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Section: Photoluminescence Spectroscopymentioning

confidence: 96%

“…It is related to the formation of new oxygen vacancies and defects as shallow trap centers, iron oxide having the most pronounced effect, followed by cobalt oxide. Also, the results showed a new broad PL band appearing in the lower energy domain, assigned to deep defects and oxygen vacancies [70,75]. Modification of aluminosilicate gel containing titanium in the network with oxides 3d metals from the VIII group leads to obtaining three obvious PL signals at about 415, 485, and 575 nm, respectively.…”

Section: Photoluminescence Spectroscopymentioning

confidence: 96%

“…The recorded PL spectra of Ti-zeolite Y and Fe/Co/Ni-modified Ti-zeolite Y, using an excitation wavelength of 320 nm, are shown in Figure 14. Ti-zeolite Y materials with different amounts of TiO2 display two clear PL emissions peaks related to the indirect band-to-band recombination of photogenerated electron-hole pairs (in the high energy range) [74] and to the self-trapped excitons (STE) formed by electrons binding to the oxygen vacancies and defects, respectively (in the low energy range) [70,74,75]. The XPS valence band spectra revealed the VB maxima of 2.3 eV for the 2TYF sample, very close to the VB potential of 2TYC (2.2 eV) and 0.65 eV for 2TYN.…”

Section: Photoluminescence Spectroscopymentioning

confidence: 99%

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Composite Photocatalysts with Fe, Co, and Ni Oxides on Supports with Tetracoordinated Ti Embedded into Aluminosilicate Gel during Zeolite Y Synthesis

Petcu,

Anghel,

Atkinson

et al. 2024

Gels

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Ti-aluminosilicate gels were used as supports for the immobilization of Fe, Co, and Ni oxides (5%) by impregnation and synthesis of efficient photocatalysts for the degradation of β-lactam antibiotics from water. Titanium oxide (1 and 2%) was incorporated into the zeolite network by modifying the gel during the zeolitization process. The formation of the zeolite Y structure and its microporous structure were evidenced by X-ray diffraction and N2 physisorption. The structure, composition, reduction, and optical properties were studied by X-ray diffraction, H2-TPR, XPS, Raman, photoluminescence, and UV–Vis spectroscopy. The obtained results indicated a zeolite Y structure for all photocatalysts with tetracoordinated Ti4+ sites. The second transitional metals supported by the post-synthesis method were obtained in various forms, such as oxides and/or in the metallic state. A red shift of the absorption edge was observed in the UV–Vis spectra of photocatalysts upon the addition of Fe, Co, or Ni species. The photocatalytic performances were evaluated for the degradation of cefuroxime in water under visible light irradiation. The best results were obtained for iron-immobilized photocatalysts. Scavenger experiments explained the photocatalytic results and their mechanisms. A different contribution of the active species to the photocatalytic reactions was evidenced.

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Production of magnetic photocatalysts from TiO₂, Fe(NO₃)₃ and sucrose and their application for the degradation of model organic contaminants

de Oliveira Pereira,

do Rosario Guimarães,

Zampiere

et al. 2024

J of Chemical Tech & Biotech

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BACKGROUNDPhotocatalysis is an efficient method for the removal of organic contaminants in wastewater. In this study, different magnetic photocatalysts for the degradation of organic compounds were prepared.RESULTSTi/C/Fe photocatalysts were prepared by supporting TiO2 (20, 40 and 60% w/w) on a carbon/iron oxide (C/Fe) magnetic carrier. Characterization via Raman spectroscopy, X‐ray diffractometry, thermal analysis, X‐ray fluorescence, scanning electron microscopy and energy‐dispersive X‐ray spectroscopy/elemental mapping and magnetic property analysis by vibrating‐sample magnetometry confirmed the presence of TiO2, Fe3O4, Fe3C and char in the photocatalysts as well as their magnetic properties. The results of specific surface area analysis showed that the C/Fe support had a surface area of 183 m2 g−1 and that this area decreased with an increasing amount of supported TiO2, reaching up to 129 m2 g−1. Diffuse reflectance spectroscopy characterization revealed that the bandgap values obtained for the photocatalysts (Ti/C/Fe) were lower than 3.2 eV. The prepared photocatalysts showed high efficiency in degrading the contaminants Remazol Black (RB5) (99%), paracetamol (77%) and phenol (90%). Recovery and reuse experiments using RB5 showed that after the fourth reaction, the photocatalytic efficiency was reduced by 50%, and the recovery reached up to 70%. Sedimentation kinetics showed that while only 6% of the TiO2 was deposited, up to 89% of the photocatalysts were deposited.CONCLUSIONSThese results indicate that the photocatalysts showed excellent photocatalytic efficiency for different contaminants and can be easily and quickly separated from the reaction medium by magnetic separation. © 2024 Society of Chemical Industry (SCI).

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Brij 58–activated carbon assisted synthesis of Ag/Ag2O/TiO2-AC photocatalysts for efficient organic pollutants degradation

Cited by 12 publications

References 61 publications

Composite Photocatalysts with Fe, Co, Ni Oxides on Supports with Tetracoordinated Ti Embedded into Aluminosilicate Gel during Zeolite Y Synthesis

Composite Photocatalysts with Fe, Co, Ni Oxides on Supports with Tetracoordinated Ti Embedded into Aluminosilicate Gel during Zeolite Y Synthesis

Composite Photocatalysts with Fe, Co, and Ni Oxides on Supports with Tetracoordinated Ti Embedded into Aluminosilicate Gel during Zeolite Y Synthesis

Production of magnetic photocatalysts from TiO₂, Fe(NO₃)₃ and sucrose and their application for the degradation of model organic contaminants

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Brij 58–activated carbon assisted synthesis of Ag/Ag2O/TiO2-AC photocatalysts for efficient organic pollutants degradation

Cited by 12 publications

References 61 publications

Composite Photocatalysts with Fe, Co, Ni Oxides on Supports with Tetracoordinated Ti Embedded into Aluminosilicate Gel during Zeolite Y Synthesis

Composite Photocatalysts with Fe, Co, Ni Oxides on Supports with Tetracoordinated Ti Embedded into Aluminosilicate Gel during Zeolite Y Synthesis

Composite Photocatalysts with Fe, Co, and Ni Oxides on Supports with Tetracoordinated Ti Embedded into Aluminosilicate Gel during Zeolite Y Synthesis

Production of magnetic photocatalysts from TiO2, Fe(NO3)3 and sucrose and their application for the degradation of model organic contaminants

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Production of magnetic photocatalysts from TiO₂, Fe(NO₃)₃ and sucrose and their application for the degradation of model organic contaminants