2D/2D Bi2MoO6/g-C3N4 S-scheme heterojunction photocatalyst with enhanced visible-light activity by Au loading

Li, Qiaoqiao; Zhao, Wenli; Zhai, Zicheng; Ren, Kaixu; Wang, Tingyu; Guan, Hao; Shi, Haifeng

doi:10.1016/j.jmst.2020.03.038

Cited by 184 publications

(52 citation statements)

References 47 publications

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“…Theoretically, the excited electrons will transfer to CB of AgVO 3 from the CB of AgBr due to fact that the CB of AgVO 3 is more cathodic than that of AgBr, leading to numerous electrons accumulate on CB of AgVO 3 . Meanwhile, the holes exist on the VB of AgVO 3 will migrate to the VB of AgBr, this was because the VB of AgVO 3 is more positive than that of AgBr 55,56 . However, it should be noted that the potential of OH − /OH (+1.99 eV) and H 2 O/OH (+2.27 eV) is more positive than the VB of AgBr (+1.45 eV), indicating that holes cannot oxidize the OH − and H 2 O to generate ·OH, which was not conformed to the trapping experiments.…”

Section: Resultsmentioning

confidence: 95%

“…Meanwhile, the holes exist on the VB of AgVO 3 will migrate to the VB of AgBr, this was because the VB of AgVO 3 is more positive than that of AgBr. 55,56 However, it should be noted that the potential of OH − /OH (+1.99 eV) and H 2 O/OH (+2.27 eV) is more positive than the VB of AgBr (+1.45 eV), indicating that holes cannot oxidize the OH − and H 2 O to generate •OH, which was not conformed to the trapping experiments. Hence, the conventional heterostructure (Figure 12A) could not be used to explain the photocatalytic mechanism of RGO 1% / AgVO 3 /AgBr 30% .…”

Section: Photocatalytic Mechanismmentioning

confidence: 81%

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Designing effective and stable S‐scheme RGO/AgVO₃/AgBr hybrid with enhanced photocatalytic performance

et al. 2021

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The low separation of photogenerated electron-hole pairs and cycle stability has been the main bottleneck which restricts the development of photocatalytic technology for water purification. Here, RGO/AgVO 3 composites were fabricated by photoultrasonic assisted reduction method, and AgBr nanoparticles were assembled on the surface of RGO/AgVO 3 via an in situ ion exchange method. A series of characterization and experimental results indicated that the introduction of RGO influenced the growth of crystal phase for AgVO 3 nanorods, resulting that AgVO 3 nanorods became thicker and shorter with the increase in RGO content. Moreover, RGO could also work as a bridge to promote the migration of electrons, leading different improvement for photocatalytic activity. Furthermore, in situ growth of AgBr on the surface of AgVO 3 nanorods could prevent its agglomeration and exfoliation, thus improving the photocatalytic activity and cycle stability of composites. RGO 1% /AgVO 3 /AgBr 30% exhibited excellent photocatalytic activity and stability for methylene blue (MB) degradation due to its unique structure, and its removal ratio reached at 96.2% within 50 min. Meanwhile, the separation of photogenerated electron-hole pairs of AgVO 3 was markedly improved due to the introduction of RGO and AgBr. Based on the trapping experiments and theoretical calculation of band gap, a possible S-scheme photocatalytic mechanism for improved photocatalytic activity was proposed.

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Section: Resultsmentioning

confidence: 95%

Section: Photocatalytic Mechanismmentioning

confidence: 81%

Designing effective and stable S‐scheme RGO/AgVO₃/AgBr hybrid with enhanced photocatalytic performance

et al. 2021

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“…The hydrothemal method (Figure 5) was employed to develop an S-scheme heterostructure for TC [68], 4-nitroaniline [69], and methylene blue (MB) [70] Photoreduction and hydrothermal coupled methods were involved in the development of a Bi2MoO6 (EG = 2.64 eV)/g-C3N4 (EG = 2.76 eV) S-scheme heterostructure [71] for RhB removal. Using a low photocatalyst dosage (5 mg/100 mL) and RhB concentration (5 mg/L), it was possible to remove 97.6% of the organic pollutant in 40 min under 300 W Vis light irradiation.…”

Section: Heterostructures Obtained By Hydrothermal Methodsmentioning

confidence: 99%

“…A similar study involving three dye molecules (MG, RhB, and MO) and one antibiotic (TC) was done with a BiOBr nanosheets (EG = 2.62 eV)/BiO(HCOO)Br-x tube (EG = 2.96 eV) S-scheme heterostructure [74] obtained by the precipitation method. The two heterostructures use the same irradi- Photoreduction and hydrothermal coupled methods were involved in the development of a Bi 2 MoO 6 (E G = 2.64 eV)/g-C 3 N 4 (E G = 2.76 eV) S-scheme heterostructure [71] for RhB removal. Using a low photocatalyst dosage (5 mg/100 mL) and RhB concentration (5 mg/L), it was possible to remove 97.6% of the organic pollutant in 40 min under 300 W Vis light irradiation.…”

Section: Heterostructures Obtained By One-pot and Precipitation Methodsmentioning

confidence: 99%

Photocatalytic Activity of S-Scheme Heterostructure for Hydrogen Production and Organic Pollutant Removal: A Mini-Review

Eneşca

Andronic

2021

Nanomaterials

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Finding new technologies and materials that provide real alternatives to the environmental and energy-related issues represents a key point on the future sustainability of the industrial activities and society development. The water contamination represents an important problem considering that the quantity and complexity of organic pollutant (such as dyes, pesticides, pharmaceutical active compounds, etc.) molecules can not be efficiently addressed by the traditional wastewater treatments. The use of fossil fuels presents two major disadvantages: (1) environmental pollution and (2) limited stock, which inevitably causes the energy shortage in various countries. A possible answer to the above issues is represented by the photocatalytic technology based on S-scheme heterostructures characterized by the use of light energy in order to degrade organic pollutants or to split the water molecule into its components. The present mini-review aims to outline the most recent achievements in the production and optimization of S-scheme heterostructures for photocatalytic applications. The paper focuses on the influence of heterostructure components and photocatalytic parameters (photocatalyst dosage, light spectra and intensity, irradiation time) on the pollutant removal efficiency and hydrogen evolution rate. Additionally, based on the systematic evaluation of the reported results, several perspectives regarding the future of S-scheme heterostructures were included.

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“…As a promising metal-free polymeric photocatalyst, graphitic carbon nitride has features of good physicochemical stability, a narrow bandgap, and appropriate band potential (Wang et al, 2009;Li et al, 2020a;Xia et al, 2020;Xie et al, 2020;Li et al, 2021b;Zhang et al, 2021a). In addition, the CO 2 molecule exhibits a strong affinity to pyridine nitrogen in g-C 3 N 4 , which is beneficial for CO 2 reduction (Zhu et al, 2017).…”

Section: Introductionmentioning

confidence: 99%

DFT Study on Regulating the Electronic Structure and CO2 Reduction Reaction in BiOBr/Sulphur-Doped G-C3N4 S-Scheme Heterojunctions

Fei

Zhang

et al. 2021

Front. Nanotechnol.

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Photocatalytic CO2 reduction is a promising method to mitigate the greenhouse effect and energy shortage problem. Development of effective photocatalysts is vital in achieving high photocatalytic activity. Herein, the S-scheme heterojunctions composed by BiOBr and g-C3N4 with or without S doping are thoroughly investigated for CO2 reduction by density functional theory (DFT) calculation. Work function and charge density difference demonstrate the existence of a built-in electric field in the system, which contributes to the separation of photogenerated electron-hole pairs. Enhanced strength of a built-in electric field is revealed by analysis of Bader charge and electric field intensity. The results indicate that S doping can tailor the electronic structures and thus improve the photocatalytic activity. According to the change in absorption coefficient, system doping can also endow the heterojunction with increased visible light absorption. The in-depth investigation indicates that the superior CO2 reduction activity is ascribed to low rate-determining energy. And both of the heterojunctions are inclined to generate CH3OH rather than CH4. Furthermore, S doping can further reduce the energy from 1.23 to 0.44 eV, indicating S doping is predicted to be an efficient photocatalyst for reducing CO2 into CH3OH. Therefore, this paper provides a theoretical basis for designing appropriate catalysts through element doping and heterojunction construction.

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2D/2D Bi2MoO6/g-C3N4 S-scheme heterojunction photocatalyst with enhanced visible-light activity by Au loading

Cited by 184 publications

References 47 publications

Designing effective and stable S‐scheme RGO/AgVO₃/AgBr hybrid with enhanced photocatalytic performance

Designing effective and stable S‐scheme RGO/AgVO₃/AgBr hybrid with enhanced photocatalytic performance

Photocatalytic Activity of S-Scheme Heterostructure for Hydrogen Production and Organic Pollutant Removal: A Mini-Review

DFT Study on Regulating the Electronic Structure and CO2 Reduction Reaction in BiOBr/Sulphur-Doped G-C3N4 S-Scheme Heterojunctions

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2D/2D Bi2MoO6/g-C3N4 S-scheme heterojunction photocatalyst with enhanced visible-light activity by Au loading

Cited by 184 publications

References 47 publications

Designing effective and stable S‐scheme RGO/AgVO3/AgBr hybrid with enhanced photocatalytic performance

Designing effective and stable S‐scheme RGO/AgVO3/AgBr hybrid with enhanced photocatalytic performance

Photocatalytic Activity of S-Scheme Heterostructure for Hydrogen Production and Organic Pollutant Removal: A Mini-Review

DFT Study on Regulating the Electronic Structure and CO2 Reduction Reaction in BiOBr/Sulphur-Doped G-C3N4 S-Scheme Heterojunctions

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Designing effective and stable S‐scheme RGO/AgVO₃/AgBr hybrid with enhanced photocatalytic performance

Designing effective and stable S‐scheme RGO/AgVO₃/AgBr hybrid with enhanced photocatalytic performance