The precursor-guided hydrothermal synthesis of CuBi2O4/WO3 heterostructure with enhanced photoactivity under simulated solar light irradiation and mechanism insight

Wang, Liping; Huang, Tong; Yang, Guangpeng; Lu, Changyu; Dong, Feilong; Li, Yuliang; Guan, Wenxian

doi:10.1016/j.jhazmat.2019.120956

Cited by 123 publications

(23 citation statements)

References 54 publications

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“…As shown in Figure 2b, the Cu 2+ peaks of the CBO-0.5 h shifted to lower binding energy of 933.65 eV and 953.35 eV, which corresponded to the Cu 2p 3/2 and Cu 2p 1/2 binding energies of Cu 2+ , respectively. Two shake-up satellites appeared at about 962 eV and 941 eV [1,2,26,27]. The high-resolution Bi 4f spectrum of pristine CBO-0.5 h in Figure 2c can be divided into two main peaks at 164.05 eV and 158.8 eV, which originated from Bi 4f 5/2 and Bi 4f 7/2 binding energies of Bi 3+ , respectively.…”

Section: Resultsmentioning

confidence: 99%

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%

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

et al. 2019

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“…The refractive index (n λ ) and extinction coefficient index (k λ ) of CuBi 2 O 4 were determined from the reflectance measurements; the complex optical refractive index was calculated using the well-known formula [22,23]:…”

Section: Optical Constantsmentioning

confidence: 99%

Synthesis and characterization of the semiconductor CuBi2O4 for optical and dielectric studies. Application to methyl violet degradation under visible light

Djaballah

Bagtache²,

Tartaya

et al. 2021

Reac Kinet Mech Cat

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This work is devoted to the synthesis, optical and dielectric properties of CuBi 2 O 4 prepared by sol-gel route. The X-ray diffraction analysis shows that CuBi 2 O 4 crystallizes in a tetragonal symmetry (SG: P4/cnn) with lattice parameters: a = 8.5023 Å and c = 5.8250 Å; the Rietveld refinement reveals a high purity of the spinel. The crystallite size (D = 47.84 nm) was calculated from the Williamson Hall-plot. The presence of Cu-O and Bi-O bonds with Cu 2+ tetrahedrally coordinated is confirmed by the Raman spectroscopy. We also report the optical and dielectric properties of CuBi 2 O 4 , including the refractive index (n λ ), optical (σ opt ) and electrical (σ ele ) conductivities, extinction coefficient (k λ ), dissipation factor (tan δ) and relaxation time (τ). The forbidden band (E g ), measured from the UV-Visible diffuse reflectance spectroscopy, is found in the range (1.50-1.55 eV) and confirmed by these approaches. Furthermore, the as-prepared compound has been successfully tested for the first time for the methyl violet degradation under visible light. The results show a conversion rate of 75% under illumination of 4 h 30 min and that the kinetics follows a first order model.

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“…Thus, the corresponding photoexcited electrons and holes were left at the CB of CdSe QDs and the VB of BiOCl, respectively. [62] And the electrons in the CB of CdSe QDs move to the surface of CdSe QDs and reduce O 2 to ⋅O 2 À . Simultaneously, the holes in the VB of BiOCl could oxidize H 2 O or OH À into ⋅OH.…”

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

confidence: 99%

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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The precursor-guided hydrothermal synthesis of CuBi2O4/WO3 heterostructure with enhanced photoactivity under simulated solar light irradiation and mechanism insight

Cited by 123 publications

References 54 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

Synthesis and characterization of the semiconductor CuBi2O4 for optical and dielectric studies. Application to methyl violet degradation under visible light

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

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