Photocatalytic Cr(VI) elimination over BUC-21/N-K2Ti4O9 composites: Big differences in performance resulting from small differences in composition

Wang, Xun; Li, Yuxuan; Yi, Xiaoyan; Zhao, Chen; Wang, Peng; Deng, Jiguang; Wang, Chong-Chen

doi:10.1016/s1872-2067(20)63629-4

Cited by 36 publications

(15 citation statements)

References 68 publications

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“…The factors that cause this phenomenon are as follows: First, the surface of the catalyst becomes more positive by the addition of citric acid, which promotes the adsorption of HCrO 4 − or Cr 2 O 7 2− ions [65]. Second, photogenerated holes can oxidize citric acid, which is equivalent to promoting the separation of photogenerated carriers and prolonging the lifetime of photogenerated electrons [61,66]. The above conclusion is confirmed by the corresponding UV-vis absorption spectra in Figure S8.…”

Section: Photocatalytic Activitymentioning

confidence: 99%

Spherical Bi2WO6/Bi2S3/MoS2 n-p Heterojunction with Excellent Visible-Light Photocatalytic Reduction Cr(VI) Activity

Ren

Gong

et al. 2020

Nanomaterials

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Exploiting excellent photocatalytic activity and stable heterostructure composites are of critical importance for environmental sustainability. The spherical Bi2WO6/Bi2S3/MoS2 n-p heterojunction is first prepared via an in situ hydrothermal method using Bi2WO6, Na2MoO4·2H2O, and CH4N2S, in which the intermediate phase Bi2S3 is formed due to chemical coupling interaction of Bi2WO6 and CH4N2S. Scanning electron microscopy indicates that the compactness of the sample can be easily adjusted by changing the contents of S and Mo sources in the solution. The results of ultraviolet–visible (UV–vis) diffuse reflectance spectra, photoluminescence, transient photocurrent response, and electrochemical impedance spectra indicate that the formation of heterojunctions contributes to enhancing visible-light utilization and promoting photogenerated carrier separation and transfer. The composite material is used as a catalyst for the visible light photocatalytic reduction of Cr(VI). Remarkably, the optimal Bi2WO6/Bi2S3/MoS2 n-p heterojunction achieves the greatest Cr(VI) reduction rate of 100% within 75 min (λ > 420 nm, pH = 2); this rate is considerably better than the Cr(VI) reduction rate of pure Bi2WO6. The recycling experiment also reveals that the photocatalytic performance of the n-p heterojunction toward Cr(VI) is still maintained at 80% after three cycles, indicating that the n-p heterojunction has excellent structural stability. The capture experiment proves that the main active species in the system are electrons. The reasonable mechanism of Bi2WO6/Bi2S3/MoS2 photocatalytic reduction Cr(VI) is proposed. Our work provides new research ideas for the design of ternary heterojunction composites and new strategies for the development of photocatalysts for wastewater treatment.

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Section: Photocatalytic Activitymentioning

confidence: 99%

Spherical Bi2WO6/Bi2S3/MoS2 n-p Heterojunction with Excellent Visible-Light Photocatalytic Reduction Cr(VI) Activity

Ren

Gong

et al. 2020

Nanomaterials

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“…These suspensions were centrifuged at 8000 rpm for 5 min, and the supernatants were subsequently examined with UV-vis spectroscopy. The concentration of TC solution was quantified via the absorbance peak around 356 nm, while the Cr( vi ) solution had to firstly undergo diphenyl carbazide (DPC) colorimetric method, 42 then its concentration could be deduced by spectrophotometer at 543 nm.…”

Section: Methodsmentioning

confidence: 99%

Simultaneous photocatalytic tetracycline oxidation and chromate reduction via a jointed synchronous pathway upon Z-scheme Bi₁₂O₁₇Cl₂/AgBr: insight into intermediates and mechanism

Zhai

Ren

Zheng

et al. 2022

Environ. Sci.: Nano

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“…K 2 Ti 4 O 9 , comprising 2D layers with octahedral TiO 2 units bridged by oxygen atoms, has wide-bandgap energies of 3.2–3.4 eV that can be used only in the UV region . It was proposed that nitrogen doping can adjust the bandgap energy.…”

Section: Recent Progress In Mof-based Photocatalystsmentioning

confidence: 99%

Recent Progress in the Development of MOF-Based Photocatalysts for the Photoreduction of Cr^(VI)

Jafarzadeh

2022

ACS Appl. Mater. Interfaces

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There has been a direct correlation between the rate of industrial development and the spread of pollution on Earth, particularly in the last century. The organic and inorganic pollutants generated from industrial activities have created serious risks to human life and the environment. The concept of sustainability has emerged to tackle the environmental issues in developing chemical-based industries. However, pollutants have continued to be discharged to water resources, and finding appropriate techniques for the removal and remedy of wastewater is in high demand. Chromium is one of the high-risk heavy metals in industrial wastewaters that should be removed via physical adsorption and/or transformed into less hazardous chemicals. Photocatalysis as a sustainable process has received considerable attention as it utilizes sunlight irradiation to remedy Cr(VI) via a cost-effective process. Numerous photocatalytic systems have been developed up to now, but metal–organic frameworks (MOFs) have gained growing attention because of their unique versatilities and facile structural modulations. A variety of MOF-based photocatalysts have been widely employed for the photoreduction of Cr(VI). Here, we review the recent progress in the design of MOF photocatalysts and summarize their performance in photoreduction reactions.

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Photocatalytic Cr(VI) elimination over BUC-21/N-K2Ti4O9 composites: Big differences in performance resulting from small differences in composition

Cited by 36 publications

References 68 publications

Spherical Bi2WO6/Bi2S3/MoS2 n-p Heterojunction with Excellent Visible-Light Photocatalytic Reduction Cr(VI) Activity

Spherical Bi2WO6/Bi2S3/MoS2 n-p Heterojunction with Excellent Visible-Light Photocatalytic Reduction Cr(VI) Activity

Simultaneous photocatalytic tetracycline oxidation and chromate reduction via a jointed synchronous pathway upon Z-scheme Bi₁₂O₁₇Cl₂/AgBr: insight into intermediates and mechanism

Recent Progress in the Development of MOF-Based Photocatalysts for the Photoreduction of Cr^(VI)

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Photocatalytic Cr(VI) elimination over BUC-21/N-K2Ti4O9 composites: Big differences in performance resulting from small differences in composition

Cited by 36 publications

References 68 publications

Spherical Bi2WO6/Bi2S3/MoS2 n-p Heterojunction with Excellent Visible-Light Photocatalytic Reduction Cr(VI) Activity

Spherical Bi2WO6/Bi2S3/MoS2 n-p Heterojunction with Excellent Visible-Light Photocatalytic Reduction Cr(VI) Activity

Simultaneous photocatalytic tetracycline oxidation and chromate reduction via a jointed synchronous pathway upon Z-scheme Bi12O17Cl2/AgBr: insight into intermediates and mechanism

Recent Progress in the Development of MOF-Based Photocatalysts for the Photoreduction of Cr(VI)

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Simultaneous photocatalytic tetracycline oxidation and chromate reduction via a jointed synchronous pathway upon Z-scheme Bi₁₂O₁₇Cl₂/AgBr: insight into intermediates and mechanism

Recent Progress in the Development of MOF-Based Photocatalysts for the Photoreduction of Cr^(VI)