Activation of H2O2 by photo-generated electrons for enhanced visible light driven methylene blue degradation with ZnFe2O4/BiVO4 heterojunction

Cao, Yuehong; Ren, Yu; Zhang, Jinteng; Lin, Yanhong

doi:10.1016/j.optmat.2021.111637

Cited by 15 publications

(7 citation statements)

References 34 publications

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“…SPV measurements were performed on the catalysts to investigate the separation and transfer properties of photogenerated carriers on the catalyst surface. Theoretically, a positive signal represents the migration of holes to the surface and negative signal represents electrons transfer to the surface. − Typically, TiO 2 is a n-type semiconductor that should reflect a positive response in the SPV spectra, with which our measurement results were consistent. However, it was shown in Figure a that N-doped TiO 2 exhibited a significant negative signal, indicating a large number of electrons migrating from the bulk phase to the surface.…”

Section: Resultssupporting

confidence: 59%

N-Doped TiO₂ Coupled with Manganese-Substituted Phosphomolybdic Acid Composites As Efficient Photocatalysis-Fenton Catalysts for the Degradation of Rhodamine B

Chen

et al. 2022

Langmuir

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The effectiveness of photocatalytic and Fenton reactions in the synergistic treatment of water pollution problems has become indisputable. In this paper, nitrogen-doped TiO2 was selected as the catalyst for the photocatalytic reaction and manganese-substituted phosphomolybdic acid was used as the Fenton reagent, the two of which were combined together by acid impregnation to construct a binary photocatalysis-Fenton composite catalyst. The degradation experiments of the composite catalyst on RhB indicated that under UV–vis irradiation, the composite catalyst could degrade RhB almost completely within 8 min, and the degradation rate was 19.7 times higher than that of N-TiO2, exhibiting a superior degradation ability. Simultaneously, a series of characterization methods were employed to analyze the structure, morphology, and optical properties of the catalysts. The results demonstrated that the nitrogen doping not only expanded the photo response range of TiO2 but reduced the work function of TiO2, which facilitated the transfer of electrons to the loaded Mn-HPMo side and further promoted the electron–hole separation efficiency. In addition, the introduction of Mn-HPMo provided three pathways for the activation of hydrogen peroxide, which enhanced the degradation activity. This study provides novel insights into the construction of binary and efficient catalysts with multiple hydroxyl radical generation pathways.

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Section: Resultssupporting

confidence: 59%

N-Doped TiO₂ Coupled with Manganese-Substituted Phosphomolybdic Acid Composites As Efficient Photocatalysis-Fenton Catalysts for the Degradation of Rhodamine B

Chen

et al. 2022

Langmuir

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“…To further investigate the photogenerated electron–hole separation and transfer properties on the catalyst surface, SPV tests were performed on the catalyst surface. Typically, BiVO 4 was an n-type semiconductor, so the direction of the built-in electric field in the space charge region pointed from the bulk phase to the surface, and the SPV response was a positive signal . As shown in Figure a, positive photovoltaic responses of different intensities were observed under monochromatic light irradiation in the range of 300–800 nm, indicating that the photogenerated holes preferred to migrate toward the surface.…”

Section: Results and Discussionmentioning

confidence: 98%

“…5 Photocatalysis is an effective means of wastewater treatment, 6 but most photocatalytic techniques take a long time and still fail to achieve the desired degradation. 7 The slow degradation rate makes it unable to meet the needs of practical wastewater treatment. Recently, advanced oxidation processes based on SO 4…”

Section: ■ Introductionmentioning

confidence: 99%

Efficient Photocatalytic Activation of Peroxymonosulfate by Cobalt-Doped Oxygen-Vacancies-Rich BiVO₄ for Rapid Tetracycline Degradation

Chen,

Meng,

Feng

et al. 2024

Langmuir

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In this work, cobalt-doped oxygen-vacancies-rich BiVO 4 (Co/BiVO 4 -V o ) was successfully synthesized for the degradation of tetracycline (TC) by activated peroxymonosulfate (PMS) under visible light. The morphologies, microstructures, and optical properties of the photocatalysts were analyzed in detail. Co/BiVO 4 -V o exhibited significantly enhanced degradation, removing 92.3% of TC within 10 min, which was greater than those of pure BiVO 4 (62.2%) and oxygenvacancies-rich BiVO 4 (BiVO 4 -V o ) (72.0%), respectively. The photogenerated charge separation and transport properties were explored through surface photovoltage (SPV), photoluminescence spectrum (PL), and UV−vis diffuse reflectance spectroscopy (UV−vis DRS) measurements. Additionally, an in-depth investigation was conducted on the photocatalytically assisted advanced oxidation processes based on SO 4•− (SR-AOPs) for the degradation of organic pollutants. The experimental results showed that the introduction of oxygen vacancies and Co doping achieved an effective separation of photogenerated carriers, which could accelerate the cycling between Co 3+ and Co 2+ and further activate PMS. The results of free radical capture experiments and electron spin resonance (ESR) experiments showed that reactive oxygen species (ROSs) such as 1 O 2 , •O 2 − , and SO 4•− played a dominant role in the removal of pollutants. This work provides a novel insight into the further development of efficient and rapid PMS photoactivators for environmental remediation of water bodies.

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“…Light can stimulate NCM to form photoelectron-hole pairs and generate hydroxyl radicals, which can mineralize or destroy organic compounds by hydroxyl radicals (Wei et al, 2020). Azo dyes had a high reaction rate with hydroxyl radicals and can be used as scavengers for removing hydroxyl radicals (Dostanić et al, 2020;Cao et al, 2021). Therefore, the photodegradation of acid orange 8 has the best effect in the NCM system.…”

Section: Resultsmentioning

confidence: 99%

Factors influencing the photodegradation of acid orange 8 by nitrocellulose membranes

Fu²,

Song³

et al. 2022

Front. Environ. Sci.

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Nitrocellulose membranes (NCM) have broad application prospects in the field of organic wastewater treatment. In this research, acid orange 8 was used as the target pollutant, and the effects of factors, such as concentration, light intensity, anions, and cations, on the photodegradation of acid orange 8 were investigated under simulated sunlight by NCM. The results showed that the degradation rate constant of acid orange 8 in the NCM system was 1.94 × 10−3 min−1, which was 27.3 times that in the pure water. The photodegradation rate increases with decreasing concentration in the range of 20–120 μmol/L for acid orange 8. The photodegradation rate increased with increasing NCM area. The degradation effect of acid orange 8 increased with the increase of light intensity. Acidic conditions were favorable for the degradation of acid orange 8. The optimal conditions for photodegradation of acid orange 8 were the solution concentration of 20 μmol/L, membrane area of 17.35 cm2, light intensity of 481 μmol/(m2s), and pH value of 3.0. The effect of different components in water on the photodegradation of acid orange 8 was different. Ca2+, Mg2+, and NO3− could promote the photodegradation of acid orange 8, while CO32- could inhibit the photodegradation. The effect of degrading acid orange 8 by NCM under light conditions is obvious, which can provide a new method for the removal of acid orange 8 in wastewater.

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Activation of H2O2 by photo-generated electrons for enhanced visible light driven methylene blue degradation with ZnFe2O4/BiVO4 heterojunction

Cited by 15 publications

References 34 publications

N-Doped TiO₂ Coupled with Manganese-Substituted Phosphomolybdic Acid Composites As Efficient Photocatalysis-Fenton Catalysts for the Degradation of Rhodamine B

N-Doped TiO₂ Coupled with Manganese-Substituted Phosphomolybdic Acid Composites As Efficient Photocatalysis-Fenton Catalysts for the Degradation of Rhodamine B

Efficient Photocatalytic Activation of Peroxymonosulfate by Cobalt-Doped Oxygen-Vacancies-Rich BiVO₄ for Rapid Tetracycline Degradation

Factors influencing the photodegradation of acid orange 8 by nitrocellulose membranes

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Activation of H2O2 by photo-generated electrons for enhanced visible light driven methylene blue degradation with ZnFe2O4/BiVO4 heterojunction

Cited by 15 publications

References 34 publications

N-Doped TiO2 Coupled with Manganese-Substituted Phosphomolybdic Acid Composites As Efficient Photocatalysis-Fenton Catalysts for the Degradation of Rhodamine B

N-Doped TiO2 Coupled with Manganese-Substituted Phosphomolybdic Acid Composites As Efficient Photocatalysis-Fenton Catalysts for the Degradation of Rhodamine B

Efficient Photocatalytic Activation of Peroxymonosulfate by Cobalt-Doped Oxygen-Vacancies-Rich BiVO4 for Rapid Tetracycline Degradation

Factors influencing the photodegradation of acid orange 8 by nitrocellulose membranes

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N-Doped TiO₂ Coupled with Manganese-Substituted Phosphomolybdic Acid Composites As Efficient Photocatalysis-Fenton Catalysts for the Degradation of Rhodamine B

N-Doped TiO₂ Coupled with Manganese-Substituted Phosphomolybdic Acid Composites As Efficient Photocatalysis-Fenton Catalysts for the Degradation of Rhodamine B

Efficient Photocatalytic Activation of Peroxymonosulfate by Cobalt-Doped Oxygen-Vacancies-Rich BiVO₄ for Rapid Tetracycline Degradation