Mechanistic insight into photochemical and photoelectrochemical degradation of organic pollutants with the use of BiVO4 and BiVO4/Co-Pi

Łęcki, Tomasz; Hamad, Hesham; Zarębska, Kamila; Wierzyńska, Ewelina; Skompska, Magdalena

doi:10.1016/j.electacta.2022.141292

Cited by 16 publications

(8 citation statements)

References 80 publications

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“…It has been shown that the χ obtained for g-C 3 N 4 (6.91 eV) leads to the band edges E CB and E VB far from those obtained from experimental values [ 29 ]. Recently, we have reported the same problem with the application of the Butler and Ginley approach in the determination of correct potentials of the band edges of BiVO 4 [ 30 ].…”

Section: Resultsmentioning

confidence: 99%

“…However, the main assumption made in the derivation of the Mott–Schottky equation, such as a perfectly planar semiconductor surface or a homogeneous distribution of electronic defects, is not fulfilled in the case of lamellar g-C 3 N 4 . Alternatively, the value of E fb may be determined from the onset potential of photocurrent by analysis of the voltammograms in the dark and under illumination [ 32 , 33 ], and this method gave very reliable results for Fe 2 O 3 [ 33 ] and BiVO 4 [ 30 ].…”

Section: Resultsmentioning

confidence: 99%

“…The details on the X-ray diffraction and UV-Vis measurements are provided in our recent paper [ 30 ] and the Supplementary Materials .…”

Section: Methodsmentioning

confidence: 99%

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Comparative Studies of g-C3N4 and C3N3S3 Organic Semiconductors—Synthesis, Properties, and Application in the Catalytic Oxygen Reduction

et al. 2023

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Exfoliated g-C3N4 is a well-known semiconductor utilized in heterogenous photocatalysis and water splitting. An improvement in light harvesting and separation of photogenerated charge carriers may be obtained by polymer doping with sulfur. In this work, we incorporate sulfur into the polymer chain by chemical polymerization of trithiocyanuric acid (C3N3S3H3) to obtain C3N3S3. The XRD measurements and TEM images indicated that C3N3S3, in contrast to g-C3N4, does not exist in the form of a graphitic structure and is not exfoliated into thin lamellas. However, both polymers have similar optical properties and positions of the conduction and valence bands. The comparative studies of electrochemical oxygen reduction and hydrogen evolution indicated that the overpotentials for the two processes were smaller for C3N3S3 than for g-C3N4. The RDE experiments in the oxygen-saturated solutions of 0.1 M NaOH have shown that O2 is electrochemically reduced via the serial pathway with two electrons involved in the first step. The spectroscopic experiments using NBT demonstrated that both polymers reveal high activity in the photocatalytic reduction of oxygen to superoxide anion radical by the photogenerated electrons.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

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Comparative Studies of g-C3N4 and C3N3S3 Organic Semiconductors—Synthesis, Properties, and Application in the Catalytic Oxygen Reduction

et al. 2023

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“…), suggesting the generation of ROS during ECL scanning. , Terephthalic acid (TA) is used to detect · OH produced in the reaction system. As shown in Figure C, the fluorescence intensity of TA in PBS increases with the ECL scanning time, suggesting the generation of fluorescent 2-hydroxy-terephthalic acid (TAOH) as a result of the reaction of · OH with TA and the production of · OH during ECL scanning . Nitroblue tetrazolium chloride (NBT) is selected as the trapping agent for O 2 ·– .…”

Section: Resultsmentioning

confidence: 99%

Construction of a Dual-Mode Biosensor with Ferrocene as Both a Signal Enhancer and a Signal Tracer for Electrochemiluminescent and Electrochemical Enantioselective Recognition

Zhu,

Zuo,

Yang

et al. 2023

Anal. Chem.

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“…The rate of oxygen reduction by the electrons photogenerated in the semiconductor may be controlled with the use of nitro blue tetrazolium chloride (NBT) . The superoxide radicals, O 2 •– , formed in the first step of photocatalytic oxygen reduction, react with NBT to form insoluble diformazan, according to the reaction presented in Scheme .…”

Section: Resultsmentioning

confidence: 99%

The Role of Boron Dopant in the Improvement of Electron Transfer in g-C₃N₄ Photocatalyst

Wierzyńska,

Korytkowska,

Kazimierczuk

et al. 2024

J. Phys. Chem. C

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In this work, graphitic carbon nitride (g-C 3 N 4 ) was doped with boron by thermal treatment with NaBH 4 . We have shown that the morphology of the modified polymer gradually changes from graphitic-like to amorphous, with increasing amounts of NaBH 4 used for annealing. On the other hand, the boron doping has a very small influence on the band gap energy, as well as on the positions of the valence and conduction band edges of the polymer, but strongly improves the activity of g-C 3 N 4 in the photocatalytic reduction of oxygen and degradation of methyl orange (8-fold increase of the degradation rate constant with respect to that of pure g-C 3 N 4 ). The enhancement of the photocatalytic properties was explained by the increased rate of charge transport, both in the polymer plane and across the film, due to formation of N−B−N bonds between the adjacent heptazine units and the interlayer Coulomb interactions. The best photocatalytic activity was obtained for samples prepared from a mixture of g-C 3 N 4 and NaBH 4 at a moderate weight ratio (4:1), while increased amounts of NaBH 4 led to significant and unfavorable changes in both the morphology and molecular structure of the polymer.

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Mechanistic insight into photochemical and photoelectrochemical degradation of organic pollutants with the use of BiVO4 and BiVO4/Co-Pi

Cited by 16 publications

References 80 publications

Comparative Studies of g-C3N4 and C3N3S3 Organic Semiconductors—Synthesis, Properties, and Application in the Catalytic Oxygen Reduction

Comparative Studies of g-C3N4 and C3N3S3 Organic Semiconductors—Synthesis, Properties, and Application in the Catalytic Oxygen Reduction

Construction of a Dual-Mode Biosensor with Ferrocene as Both a Signal Enhancer and a Signal Tracer for Electrochemiluminescent and Electrochemical Enantioselective Recognition

The Role of Boron Dopant in the Improvement of Electron Transfer in g-C₃N₄ Photocatalyst

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Mechanistic insight into photochemical and photoelectrochemical degradation of organic pollutants with the use of BiVO4 and BiVO4/Co-Pi

Cited by 16 publications

References 80 publications

Comparative Studies of g-C3N4 and C3N3S3 Organic Semiconductors—Synthesis, Properties, and Application in the Catalytic Oxygen Reduction

Comparative Studies of g-C3N4 and C3N3S3 Organic Semiconductors—Synthesis, Properties, and Application in the Catalytic Oxygen Reduction

Construction of a Dual-Mode Biosensor with Ferrocene as Both a Signal Enhancer and a Signal Tracer for Electrochemiluminescent and Electrochemical Enantioselective Recognition

The Role of Boron Dopant in the Improvement of Electron Transfer in g-C3N4 Photocatalyst

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The Role of Boron Dopant in the Improvement of Electron Transfer in g-C₃N₄ Photocatalyst