Z-scheme Bi2WO6/CuBi2O4 heterojunction mediated by interfacial electric field for efficient visible-light photocatalytic degradation of tetracycline

Yuan, Xiaojie; Shen, Dongyan; Zhang, Qiao; Zou, Hanbo; Liu, Zili; Peng, Feng

doi:10.1016/j.cej.2019.03.082

Cited by 273 publications

(55 citation statements)

References 52 publications

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“…The O 1s spectrum of CBO-0.5 was shown in Figure 2d, where the peak at 529.55 eV can be ascribed to the lattice oxygen [4,28,29]. As for the CBO-10 min and CBO-15 min samples, new peaks centered at about 530.9 eV and 531.4 eV in the XPS spectra of O 1s emerged (Figure 2d), which may represent the presence of subsurface oxygen vacancy defects [30].…”

Section: Resultsmentioning

confidence: 99%

“…Therefore, 120 °C was selected as a suitable hydrothermal temperature in this study. Eventually, we successively prepared the CuBi 2 O 4 nanocolumn arrays via a facile hydrothermal method with much shorter reaction time at lower temperature compared to the traditional hydrothermal synthesis routes [4,7,14,25,30,32,33]. The time-dependent UV-vis absorption spectra of methylene blue (MB) under light irradiation for CBO-0.5 h at the hydrothermal temperature of 120 °C were presented in Figure 5d.…”

Section: Resultsmentioning

confidence: 99%

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Short-Time Hydrothermal Synthesis of CuBi2O4 Nanocolumn Arrays for Efficient Visible-Light Photocatalysis

et al. 2019

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In this article, a short-time hydrothermal method is developed to prepare CuBi2O4 nanocolumn arrays. By using Bi(NO3)3·5H2O in acetic acid and Cu(NO3)2·3H2O in ethanol as precursor solutions, tetragonal CuBi2O4 with good visible light absorption can be fabricated within 0.5 h at 120 °C. Tetragonal structured CuBi2O4 can be formed after 15 min hydrothermal treatment, however it possesses poor visible light absorption and low photocatalytic activity. Extending the hydrothermal treatment duration to 0.5 h results in a significant improvement invisible light absorption of the tetragonal CuBi2O4. The CuBi2O4 obtained through 0.5 h hydrothermal synthesis shows a band gap of 1.75 eV and exhibits the highest photocatalytic performance among the CuBi2O4 prepared with various hydrothermal time. The removal rate of methylene blue by the 0.5 h CuBi2O4 reaches 91% under visible light irradiation for 0.5 h. This study proposes a novel strategy to prepare photoactive CuBi2O4 nanocolumn arrays within 0.5 h at a moderate temperature of 120 °C. The hydrothermal method provides a facile strategy for the fast synthesis of metal-oxide-based photocatalysts at mild reaction conditions.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Short-Time Hydrothermal Synthesis of CuBi2O4 Nanocolumn Arrays for Efficient Visible-Light Photocatalysis

et al. 2019

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“…Finally, in order to definitely elucidate the promotion mechanism, reactive species trapping experiments were employed to determine the predominant active species in the TC degradation processes over the LaCoO 3 /BiOI hybrid. In this investigation, triethanolamine (TEOA), 1, 4‐benzoquinone (BQ), and tert‐butyl alcohol ( t ‐BuOH) were chosen as the quenchers of photogenerated holes, superoxide radicals and hydroxyl radicals, respectively. As presented in Figure D, it could be clearly seen that the TC removal efficiency was severely inhibited after adding BQ or bubbling N 2 (to remove oxygen that was dissolved in the solution), and the same phenomenon could be observed when the TEOA was added, demonstrating that superoxide radicals and photo‐induced holes were the main reactive species of LaCoO 3 /BiOI in the photocatalytic degradation process of TC.…”

Section: Resultsmentioning

confidence: 99%

LaCoO₃ acts as a high‐efficiency co‐catalyst for enhancing visible‐light‐driven tetracycline degradation of BiOI

Yao

Zheng

et al. 2019

J Am Ceram Soc

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Exploring noble‐metal‐free co‐catalysts highly flexible for separating the photogenerated charge carriers is of prime importance for the visible‐light‐driven photocatalysis. Herein, three‐dimensional flower‐like BiOI microspheres were fabricated and applied to support noble‐metal‐free LaCoO3 co‐catalysts to construct a unique LaCoO3/BiOI hybrid photocatalyst with a higher ability in charge separation. As expected, the optimum tetracycline degradation rate of LaCoO3 (4.0 wt%)/BiOI was up to 0.0161 min−1, which was nearly 3.4 fold larger than that of pure BiOI (0.0048 min−1). The enhanced photocatalytic performance was mainly ascribed to the vital role of LaCoO3 co‐catalyst, which acted as an excellent electron collector for capturing the electrons generated by BiOI, effectively promoting the separation of photogenerated charge carriers and prolonging the lifetime of photo‐induced electron‐hole pairs at the same time. Furthermore, the active species trapping experiments revealed that the excellent photocatalytic activity was primarily driven by photogenerated holes and superoxide radicals. This work is expected to provide a new inspiration for rationally designing and fabricating noble‐metal‐free co‐catalyst system with high efficiency applied in environment purification.

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“…However, the calculated CB edge of BiOCl was located at 0.14 eV which was more positive than the standard O 2 /⋅O 2 À potential (-0.33 eV), [46] so that it cannot reduce the adsorbed O 2 to generate ⋅O 2 À . Meanwhile, the VB potential of CdSe was more negative than the standard OH À /⋅OH (2.4 eV), [61] so the accumulated holes in the VB of CdSe could not oxidize OH À or H 2 O into ⋅OH. The above arguments illustrated that traditional heterojunction-type II can be excluded, thus Zscheme electron-hole transport mechanism should be introduced into the CdSe/BiOCl composite photocatalysts.…”

Section: Photocatalytic Mechanism Of Z-scheme Cese/biocl Heterojunctimentioning

confidence: 98%

Green Synthesis and Direct Z‐Scheme CdSe/BiOCl Heterojunctions for Enhanced Photocatalytic Performance

et al. 2020

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The introduction of heterojunctions is an effective way to improve catalytic activity in photocatalytic composites. Herein, a series of CdSe quantum dot-modified BiOCl heterojunction composites were successfully prepared by a green in-situ deposition protocol. Photocatalytic ability of CdSe/BiOCl composite can be simply tailored by adjusting CdSe amount. The obtained CdSe/BiOCl composites showed superior photodegradation capability and excellent stability. The optimum BiOCl composite with 1.0% CdSe modification exhibited a 1.5 times higher degradation rate than pure BiOCl nanosheets, and photodegradation efficiency maintains still high after four cycles. Physical characterization confirms the formation of heterostructure, while electrochemical impedance spectroscopy and photoluminescence spectrum demonstrate composite with higher separation efficiency of photo-generated electron-hole pairs. At last, the heterojunction of Z-Scheme satisfies the photocatalytic mechanism of CdSe/BiOCl, and the holes (h + ) with superoxide radicals (⋅O 2 À ) are the main active factors in photodegradation process based on the experiment of scavengers.[a] Dr. Figure 8. Effect of scavengers on the photodegradation of Rh B over 1% CdSe/BiOCl.Figure 9. Photocatalytic mechanism of CdSe/BiOCl heterojunction composite.

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Z-scheme Bi2WO6/CuBi2O4 heterojunction mediated by interfacial electric field for efficient visible-light photocatalytic degradation of tetracycline

Cited by 273 publications

References 52 publications

Short-Time Hydrothermal Synthesis of CuBi2O4 Nanocolumn Arrays for Efficient Visible-Light Photocatalysis

Short-Time Hydrothermal Synthesis of CuBi2O4 Nanocolumn Arrays for Efficient Visible-Light Photocatalysis

LaCoO₃ acts as a high‐efficiency co‐catalyst for enhancing visible‐light‐driven tetracycline degradation of BiOI

Green Synthesis and Direct Z‐Scheme CdSe/BiOCl Heterojunctions for Enhanced Photocatalytic Performance

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Z-scheme Bi2WO6/CuBi2O4 heterojunction mediated by interfacial electric field for efficient visible-light photocatalytic degradation of tetracycline

Cited by 273 publications

References 52 publications

Short-Time Hydrothermal Synthesis of CuBi2O4 Nanocolumn Arrays for Efficient Visible-Light Photocatalysis

Short-Time Hydrothermal Synthesis of CuBi2O4 Nanocolumn Arrays for Efficient Visible-Light Photocatalysis

LaCoO3 acts as a high‐efficiency co‐catalyst for enhancing visible‐light‐driven tetracycline degradation of BiOI

Green Synthesis and Direct Z‐Scheme CdSe/BiOCl Heterojunctions for Enhanced Photocatalytic Performance

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LaCoO₃ acts as a high‐efficiency co‐catalyst for enhancing visible‐light‐driven tetracycline degradation of BiOI