Solar-driven on-site H2O2 generation and tandem photo-Fenton reaction on a triphase interface for rapid organic pollutant degradation

Ju, Yujun; Li, Hua; Wang, Ze; Huo, Shuhui; Jiang, Shan; Duan, Sicong; Yao, Yonggang; Lu, Xiaoquan; Chen, Fengjuan

doi:10.1016/j.cej.2021.133168

Cited by 41 publications

(16 citation statements)

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“…To further uncover how the charge transfer pathway influences the PEC performance, SPECM (Figure a) was used as a useful tool, previously employed by ourselves, to in situ -investigate the “fast” and “slow” charge transfer behavior through some recyclable probe molecules. − Figure b exhibits the probe approach curves (PACs) of samples, and the tip current displays an increasing trend for the above systems in the proximity of the substrates under illumination, which is called the positive feedback. These different positive feedback curves reveal that more holes can easily oxidize probe molecules (K 4 [Fe(CN) 6 ]) and form a perfect cycle, which is well supported by the results of surface charge separation efficiency (Figure d).…”

Section: Resultsmentioning

confidence: 99%

Insights into the Enhanced Photoelectrochemical Performance through Construction of the Z-Scheme and Type II Heterojunctions

et al. 2022

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Photoelectrochemical (PEC) water splitting technology is a promising strategy toward producing sustainable hydrogen fuel. However, it is an essential bottleneck to reduce severe charge recombination for the improvement of PEC performance. Construction of heterojunction systems, such as Z-scheme and type II heterojunctions, could efficiently boost charge separation, whereas the mechanism of charge separation is still ambiguous. We describe herein a charge transfer system designed with Bi 2 WO 6 /Bi 2 S 3 (BWO/BS) as a prototype. In this system, Au nanoparticles act as charge relays to engineer a charge transfer pathway, and the obtained BWO/Au/BS photoanode achieves a remarkable photocurrent density of 0.094 mA cm −2 at 1.23 V versus reversible hydrogen electrode (vs RHE), over approximately 1.2 and 2.3 times larger than those of BWO/BS/Au and BWO, exhibiting long-term photostability. More importantly, scanning photoelectrochemical microscopy (SPECM) and intensity-modulated photocurrent spectroscopy (IMPS) studies are performed to in situ-capture the photogenerated hole during the PEC process. Operando analysis reveals that the Zscheme BWO/Au/BS system (1.33 × 10 −2 cm s −1 ) exhibits higher charge transfer kinetics compared to the type II BWO/BS/Au heterostructure (0.85 × 10 −2 cm s −1 ) while efficiently suppressing charge recombination for optimized PEC activity. Note that this smart strategy can also be extended to other semiconductor-based photoanodes such as BiVO 4 . Our study offers an effective pathway for the rational design of highly efficient charge separation for solar conversion based on water splitting.

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Section: Resultsmentioning

confidence: 99%

Insights into the Enhanced Photoelectrochemical Performance through Construction of the Z-Scheme and Type II Heterojunctions

et al. 2022

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“…The Fenton reaction between Fe 2+ and H 2 O 2 , which creates hydroxyl radical and causes Fe 2+ to be oxidized to Fe +3 , is at the heart of the chemistry (Brillas 2022;Rodrigues-Silva et al 2022). The photo-Fenton process, which can use ultraviolet irradiation from natural solar light, often speeds up reaction rates and induces faster degradation of resistant pollutants than the dark process (Wang et al 2021a;Ju et al 2022).…”

Section: Photo-fenton Processmentioning

confidence: 99%

Solar photo-oxidation of recalcitrant industrial wastewater: a review

et al. 2022

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Conventional methods to clean wastewater actually lead to incomplete treatments, calling for advanced technologies to degrade recalcitrant pollutants. Herein we review solar photo-oxidation to degrade the recalcitrant contaminants in industrial wastewater, with focus on photocatalysts, reactor design and the photo-Fenton process. We discuss limitations due to low visible-light absorption, catalyst collection and reusability, and production of toxic by-products. Photodegradation of refractory organics by solar light is controlled by pH, photocatalyst composition and bandgap, pollutant properties and concentration, irradiation type and intensity, catalyst loading, and the water matrix.

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“…Photocatalysts with desired band gap energy can effectively harvest sunlight with a decrease of electron and hole (e – –h + ) pair recombination rate to enhance photocatalysis reactions. − High reactive species (HRS) such as hydroxyl ( • OH), hydroperoxyl ( • O 2 H – ), and superoxide ( • O 2 – ) radicals could be formed during photocatalysis for oxidation of organic wastewater. , A superoxide radical is an important intermediate for photocatalytic H 2 O 2 generation that may form HRS (such as • OH and • O 2 H – radicals) for oxidation of organic pollutants in wastewater …”

Section: Introductionmentioning

confidence: 99%

“…14,15 A superoxide radical is an important intermediate for photocatalytic H 2 O 2 generation that may form HRS (such as • OH and • O 2 H − radicals) for oxidation of organic pollutants in wastewater. 16 Many semiconductors including TiO 2 , ZnO, and SnO 2 have been investigated for photocatalytic H 2 O-to-H 2 O 2 oxidation. 17−19 Yet, these semiconductors still suffer from the rapid e − −h + pair recombination rate, resulting in relatively low photocatalytic efficiency.…”

Section: ■ Introductionmentioning

confidence: 99%

Nanostructured NiCo₂O₄/BiVO₄ Heterojunctions for Visible-Light Photocatalytic H₂O-to-H₂O₂ Synchronized Organic Pollutant Oxidation

Wei

Liu

Wang

2022

ACS Appl. Nano Mater.

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Photocatalytic H 2 O 2 generation using unlimited solar energy for in situ oxidation of organic pollutants in wastewater has been environmentally attractive. Photocatalytic H 2 O-to-H 2 O 2(aq) reaction by BiVO 4 , however, suffered from relatively low yields (e.g., 24 μM h −1 ) under visible-light irradiation, mainly due to its high recombination rate of charge carriers. Herein, nanostructured NiCo 2 O 4 /BiVO 4 Z-scheme heterojunctions were prepared to increase the oxygen reduction reaction for a higher H 2 O 2 yield rate (than BiVO 4 by 16 times approximately). Additionally, highly reactive superoxide ( • O 2 − ) and hydroxyl ( • OH) radicals from the photocatalytic H 2 O-to-H 2 O 2 process enhanced oxidation of a representative organic pollutant (i.e., methylene blue) under visiblelight irradiation. The photocatalytic oxidation rate constant was as high as 2 × 10 −7 M −1 s −1 . This visible-light photocatalytic H 2 O-to-H 2 O 2 synchronized oxidation of an organic pollutant by the nanostructured NiCo 2 O 4 /BiVO 4 heterojunctions demonstrates the possibility for a potential energy self-sufficient organic wastewater treatment process.

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Solar-driven on-site H2O2 generation and tandem photo-Fenton reaction on a triphase interface for rapid organic pollutant degradation

Cited by 41 publications

References 50 publications

Insights into the Enhanced Photoelectrochemical Performance through Construction of the Z-Scheme and Type II Heterojunctions

Insights into the Enhanced Photoelectrochemical Performance through Construction of the Z-Scheme and Type II Heterojunctions

Solar photo-oxidation of recalcitrant industrial wastewater: a review

Nanostructured NiCo₂O₄/BiVO₄ Heterojunctions for Visible-Light Photocatalytic H₂O-to-H₂O₂ Synchronized Organic Pollutant Oxidation

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Solar-driven on-site H2O2 generation and tandem photo-Fenton reaction on a triphase interface for rapid organic pollutant degradation

Cited by 41 publications

References 50 publications

Insights into the Enhanced Photoelectrochemical Performance through Construction of the Z-Scheme and Type II Heterojunctions

Insights into the Enhanced Photoelectrochemical Performance through Construction of the Z-Scheme and Type II Heterojunctions

Solar photo-oxidation of recalcitrant industrial wastewater: a review

Nanostructured NiCo2O4/BiVO4 Heterojunctions for Visible-Light Photocatalytic H2O-to-H2O2 Synchronized Organic Pollutant Oxidation

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Nanostructured NiCo₂O₄/BiVO₄ Heterojunctions for Visible-Light Photocatalytic H₂O-to-H₂O₂ Synchronized Organic Pollutant Oxidation