CoFe2O4 nanoparticles decorated onto graphene oxide and graphitic carbon nitride layers as a separable catalyst for ultrasound-assisted photocatalytic degradation of Bisphenol-A

Görmez, Özkan; Yakar, Ezgi; Gözmen, Belgin; Kayan, Berkant; Khataee, Alireza

doi:10.1016/j.chemosphere.2021.132663

Cited by 38 publications

(9 citation statements)

References 83 publications

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“…In fact, for gCN–CoO, the BE positions [BE(Co2p 3/2 ) = 781.1 eV; spin-orbit separation (SOS) = 15.7 eV] were in line with previously reported data for CoO [ 28 , 29 ]. In the case of gCN Ar –CoFe 2 O 4 , Co2p 3/2 BE was slightly higher (781.3 eV), in agreement with the data pertaining to CoFe 2 O 4 systems [ 36 , 49 ]. The formation of the latter oxide, confirmed by TEM and related analyses (see above), was also supported by the Fe2p peak features ( Figure 4 e; BE(Fe2p 3/2 ) = 710.6 eV; SOS = 13.3 eV) [ 36 , 49 , 50 ].…”

Section: Resultssupporting

confidence: 89%

“…The FT-IR spectra of gCN Ar and gCN air powders ( Figure 1 b) displayed similar features, with a multi-component band in the region of 1200–1650 cm −1 due to typical stretching modes of aromatic heptazine (C 6 N 7 ) heterocycles, along with the characteristic heptazine breathing mode at 808 cm −1 [ 17 , 34 , 36 ]. The broad band in the 2900–3500 cm −1 range resulted from stretching vibrations of the –OH groups at the edges of carbon nitride sheets [ 36 , 37 ] and of uncondensed –NH x groups (x = 1, 2), whose presence was also responsible for the N–H deformation mode at 885 cm −1 [ 17 , 18 , 19 , 36 ]. The presence of such moieties was confirmed by XPS data (see below).…”

Section: Resultsmentioning

confidence: 99%

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Insights into the Photoelectrocatalytic Behavior of gCN-Based Anode Materials Supported on Ni Foams

et al. 2023

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Graphitic carbon nitride (gCN) is a promising n-type semiconductor widely investigated for photo-assisted water splitting, but less studied for the (photo)electrochemical degradation of aqueous organic pollutants. In these fields, attractive perspectives for advancements are offered by a proper engineering of the material properties, e.g., by depositing gCN onto conductive and porous scaffolds, tailoring its nanoscale morphology, and functionalizing it with suitable cocatalysts. The present study reports on a simple and easily controllable synthesis of gCN flakes on Ni foam substrates by electrophoretic deposition (EPD), and on their eventual decoration with Co-based cocatalysts [CoO, CoFe2O4, cobalt phosphate (CoPi)] via radio frequency (RF)-sputtering or electrodeposition. After examining the influence of processing conditions on the material characteristics, the developed systems are comparatively investigated as (photo)anodes for water splitting and photoelectrocatalysts for the degradation of a recalcitrant water pollutant [potassium hydrogen phthalate (KHP)]. The obtained results highlight that while gCN decoration with Co-based cocatalysts boosts water splitting performances, bare gCN as such is more efficient in KHP abatement, due to the occurrence of a different reaction mechanism. The related insights, provided by a multi-technique characterization, may provide valuable guidelines for the implementation of active nanomaterials in environmental remediation and sustainable solar-to-chemical energy conversion.

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Section: Resultssupporting

confidence: 89%

Section: Resultsmentioning

confidence: 99%

Insights into the Photoelectrocatalytic Behavior of gCN-Based Anode Materials Supported on Ni Foams

et al. 2023

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“…Upon visible irradiation, the embedded composite demonstrated superior performance for selective oxidation of alcohols with a conversion ratio of 75%–90% compared to 21% and 10% conversion for CoFe 2 O 4 and Ce-UiO-66, respectively ( Khosroshahi et al, 2021 ). Despite the fact that the magnetic behavior of CoFe 2 O 4 has been extensively investigated, studies on its optical and photoelectrochemical properties are still in infancy, particularly, with concerns for poor efficiency owing to the swift recombination of carriers under light irradiation and its relatively low specific surface area ( Kefeni and Mamba, 2020 ; Görmez et al, 2022 ). Based on that, the construction of core-shell Zr-MOF-based composites has been recognized as an attractive approach to effectively promote photostability and enlarge the specific surface area, which is conducive to exposing more active sites in the photocatalytic reaction ( Liu et al, 2021 ).…”

Section: Introductionmentioning

confidence: 99%

In-situ construction of Zr-based metal-organic framework core-shell heterostructure for photocatalytic degradation of organic pollutants

et al. 2023

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Photocatalysis is an eco-friendly promising approach to the degradation of textile dyes. The majority of reported studies involved remediation of dyes with an initial concentration ≤50 mg/L, which was away from the existing values in textile wastewater. Herein, a simple solvothermal route was utilized to synthesize CoFe2O4@UiO-66 core-shell heterojunction photocatalyst for the first time. The photocatalytic performance of the as-synthesized catalysts was assessed through the photodegradation of methylene blue (MB) and methyl orange (MO) dyes at an initial concentration (100 mg/L). Under simulated solar irradiation, improved photocatalytic performance was accomplished by as-obtained CoFe2O4@UiO-66 heterojunction compared to bare UiO-66 and CoFe2O4. The overall removal efficiency of dyes (100 mg/L) over CoFe2O4@UiO-66 (50 mg/L) reached >60% within 180 min. The optical and photoelectrochemical measurements showed an enhanced visible light absorption capacity as well as effective interfacial charge separation and transfer over CoFe2O4@UiO-66, emphasizing the successful construction of heterojunction. The degradation mechanism was further explored, which revealed the contribution of holes (h+), superoxide (•O2−), and hydroxyl (•OH) radicals in the degradation process, however, h+ were the predominant reactive species. This work might open up new insights for designing MOF-based core-shell heterostructured photocatalysts for the remediation of industrial organic pollutants.

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“…A relatively strong peak at 805 cm −1 is provided by the breathing-mode of s-triazine constituent units. In case of CoFe 2 O 4 , a strong characteristic peak seen at 485–690 cm −1 is delivered by the metal–oxygen (Co-O and Fe-O) stretching vibration [25] . After coupling, the FTIR peaks responsible for the adsorbed water particles or uncondensed N−H groups show a highly diminished intensity.…”

Section: Resultsmentioning

confidence: 99%

Sonocatalytic degradation of tetracycline hydrochloride with CoFe2O4/g-C3N4 composite

Zhang

Zhao

Zhang

et al. 2023

Ultrasonics Sonochemistry

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CoFe2O4 nanoparticles decorated onto graphene oxide and graphitic carbon nitride layers as a separable catalyst for ultrasound-assisted photocatalytic degradation of Bisphenol-A

Cited by 38 publications

References 83 publications

Insights into the Photoelectrocatalytic Behavior of gCN-Based Anode Materials Supported on Ni Foams

Insights into the Photoelectrocatalytic Behavior of gCN-Based Anode Materials Supported on Ni Foams

In-situ construction of Zr-based metal-organic framework core-shell heterostructure for photocatalytic degradation of organic pollutants

Sonocatalytic degradation of tetracycline hydrochloride with CoFe2O4/g-C3N4 composite

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