Preparation of Z-scheme Ag/AgBr/BiOBr composite photocatalyst for effective removal of organic pollutants

Deng, Jian; Xue, Ruiting; Huang, Chengyuan; Yang, Jian; Li, Lei; Yang, Lei; Fan, Xiaoxing

doi:10.1016/j.chemphys.2021.111228

Cited by 19 publications

(4 citation statements)

References 33 publications

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“…TEMP (2,2,6,6-tetramethylpiperidine) was used as the probe for h + and 1 O 2 , and (5,5-dimethyl-1-pyrroline- N -oxide) (DMPO) was used for the determination of ·O 2 – . Figure b displays that, under 30 min light irradiation, the intensity of the EPR signal of TEMP becomes weaker, attributed to the consumption of TEMP by its reaction with h + . This certifies the generation of h + during the reaction process. In Figure c, no signal can be detected in the dark; however, after 30 min light irradiation, four strong 1:1:1:1 signals of DMPO–O 2 – adduct can be observed. , This proves the formation of ·O 2 – radicals during the piezo-photocatalytic process.…”

Section: Resultsmentioning

confidence: 78%

“…Figure 9b displays that, under 30 min light irradiation, the intensity of the EPR signal of TEMP becomes weaker, attributed to the consumption of TEMP by its reaction with h + . 77 This certifies the generation of h + during the reaction process. In Figure 9c, no signal can be detected in the dark; however, after 30 min light irradiation, four strong 1:1:1:1 signals of DMPO−O 2 − adduct can be observed.…”

Section: Inorganicmentioning

confidence: 73%

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Photocatalysis Meets Piezoelectricity in a Type-I Oxygen Vacancy-Rich BaTiO₃/BiOBr Heterojunction: Mechanism Insights from Characterizations to DFT Calculations

Xu,

Shan

et al. 2024

Inorg. Chem.

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It is a challenging task to design a piezoelectric photocatalyst with excellent performance under mechanical agitation instead of ultrasonic irradiation. Integrating vacancy defects into a heterojunction seems to be an effective strategy for synergistically increasing its piezo-photocatalytic performance. For this goal, a two-step hydrothermal method was adopted to architect a type-I oxygen-vacancy-rich BaTiO3/BiOBr heterojunction to surge the degradation of Rhodamine B (RhB) under the combined action of simulated sunlight irradiation and mechanical agitation. Various instrumental techniques demonstrated the formation of a BaTiO3/BiOBr heterojunction with high crystallinity. The existence of surface oxygen vacancies was confirmed by XPS and EPR tests. PFM results manifested that this heterojunction had excellent piezoelectric properties, with a piezoelectric response value of 30.31 pm V–1. Comparative experiments indicated that RhB degradation efficiency under piezo-photocatalysis over this heterojunction largely exceeded the total sum of those under piezocatalysis and photocatalysis. h+, ·O2 –, and 1O2 were the dominant reactive species for RhB degradation. The improved separation efficiency of photogenerated charges was verified by electrochemical measurements. DFT calculations indicated that the polarization of BaTiO3 could affect the electronic band structure of BiOBr. This work will provide comprehensive insights into piezo-photocatalytic mechanism at a microcosmic level and help to develop new-styled piezoelectric photocatalysts.

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Section: Resultsmentioning

confidence: 78%

Section: Inorganicmentioning

confidence: 73%

Photocatalysis Meets Piezoelectricity in a Type-I Oxygen Vacancy-Rich BaTiO₃/BiOBr Heterojunction: Mechanism Insights from Characterizations to DFT Calculations

Xu,

Shan

et al. 2024

Inorg. Chem.

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“…Figure c exhibits the signal of TEMPO in the dark and under visible-light irradiation. The signal intensity under visible-light irradiation is weaker than that in the dark, demonstrating that h + is generated under visible-light irradiation and reacts with TEMPO to decrease its signal intensity Figure d indicates that, under visible-light irradiation, the characteristic signals of DMPO- • O 2 – appear, which cannot be detected in the dark.…”

Section: Resultsmentioning

confidence: 99%

“…The signal intensity under visible-light irradiation is weaker than that in the dark, demonstrating that h + is generated under visible-light irradiation and reacts with TEMPO to decrease its signal intensity. 69 •− appear together in Figure 8f, indicative of the generation of • OH and SO 4…”

Section: •−mentioning

confidence: 95%

Constructing a Z-Scheme Co₃O₄/BiOBr Heterojunction to Enhance Photocatalytic Peroxydisulfate Oxidation of High-Concentration Rhodamine B: Mechanism, Degradation Pathways, and Toxicological Evaluations

Zhang,

Xu,

et al. 2024

Inorg. Chem.

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Photocatalytic coupling technologies have emerged as popular strategies to increase the treatment efficiency of dyecontaining wastewater. Herein, the Z-scheme Co 3 O 4 /BiOBr heterojunction (Z-CBH) was constructed and developed as a photocatalytic peroxydisulfate (PDS) activator for the degradation of high-concentration Rhodamine B (RhB). Multiple testing techniques were employed to confirm the formation of Z-CBHs. When 0.1 g•L −1 of Z-CBH20 and 1.0 mmol•L −1 of PDS were added simultaneously under simulated sunlight irradiation, the RhB degradation efficiency could approach 91.3%. Its reaction rate constant (0.01231 min −1 ) was much beyond the sum of those in the Z-CBH20/light system (0.00436 min −1 ) and the PDS/light system (0.0062 min −1 ). h + , • OH, • O 2 − , SO 4•− , and 1 O 2 were detected as the dominant reactive species for RhB degradation. The potential mechanism of photocatalytic PDS oxidation was proposed. The possible intermediates were determined by highperformance liquid chromatography-quadrupole time-of-flight mass spectrometry assisted with density functional theory and Fukui theory. The possible degradation pathways of RhB degradation were put forward. The toxicological properties of RhB and its intermediates were evaluated by quantitative structure−activity relationship prediction. This work will not only provide a reference for developing photocatalytic persulfate activators but also gain an insight into the degradation pathways of RhB and the toxicity of its intermediates.

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Fly ash–based nanocomposites: a potential material for effective photocatalytic degradation/elimination of emerging organic pollutants from aqueous stream

Gadore

Ahmaruzzaman

2021

Environ Sci Pollut Res

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Preparation of Z-scheme Ag/AgBr/BiOBr composite photocatalyst for effective removal of organic pollutants

Cited by 19 publications

References 33 publications

Photocatalysis Meets Piezoelectricity in a Type-I Oxygen Vacancy-Rich BaTiO₃/BiOBr Heterojunction: Mechanism Insights from Characterizations to DFT Calculations

Photocatalysis Meets Piezoelectricity in a Type-I Oxygen Vacancy-Rich BaTiO₃/BiOBr Heterojunction: Mechanism Insights from Characterizations to DFT Calculations

Constructing a Z-Scheme Co₃O₄/BiOBr Heterojunction to Enhance Photocatalytic Peroxydisulfate Oxidation of High-Concentration Rhodamine B: Mechanism, Degradation Pathways, and Toxicological Evaluations

Fly ash–based nanocomposites: a potential material for effective photocatalytic degradation/elimination of emerging organic pollutants from aqueous stream

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Preparation of Z-scheme Ag/AgBr/BiOBr composite photocatalyst for effective removal of organic pollutants

Cited by 19 publications

References 33 publications

Photocatalysis Meets Piezoelectricity in a Type-I Oxygen Vacancy-Rich BaTiO3/BiOBr Heterojunction: Mechanism Insights from Characterizations to DFT Calculations

Photocatalysis Meets Piezoelectricity in a Type-I Oxygen Vacancy-Rich BaTiO3/BiOBr Heterojunction: Mechanism Insights from Characterizations to DFT Calculations

Constructing a Z-Scheme Co3O4/BiOBr Heterojunction to Enhance Photocatalytic Peroxydisulfate Oxidation of High-Concentration Rhodamine B: Mechanism, Degradation Pathways, and Toxicological Evaluations

Fly ash–based nanocomposites: a potential material for effective photocatalytic degradation/elimination of emerging organic pollutants from aqueous stream

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Photocatalysis Meets Piezoelectricity in a Type-I Oxygen Vacancy-Rich BaTiO₃/BiOBr Heterojunction: Mechanism Insights from Characterizations to DFT Calculations

Photocatalysis Meets Piezoelectricity in a Type-I Oxygen Vacancy-Rich BaTiO₃/BiOBr Heterojunction: Mechanism Insights from Characterizations to DFT Calculations

Constructing a Z-Scheme Co₃O₄/BiOBr Heterojunction to Enhance Photocatalytic Peroxydisulfate Oxidation of High-Concentration Rhodamine B: Mechanism, Degradation Pathways, and Toxicological Evaluations