Highly improved photocatalytic degradation of rhodamine B over Bi2Ga4−xFexO9 solid solutions under visible light irradiation

Yang, Jia; Sun, Xiaorui; Zeng, Chong; Wang, Xiaoting; Hu, Yilan; Zeng, Ting; Shi, Jianwei

doi:10.1039/c9ra04632a

Cited by 8 publications

(16 citation statements)

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“…The photocatalytic mechanism of the ZnGa 2 O 4 with the Au cocatalyst was investigated by experimental examination as well (See Figure 7). The generation of superoxide anions, holes and hydroxyl radicals was measured via the inhibition reaction with p-benzoquinone (BQ), disodium ethylenediaminetetraacetate (EDTA-2Na), and isopropanol (IPA) as respective scavengers [32,33]. Hence, we can confirm that the hydroxyl radical plays an important role in the photodegradation of RhB.…”

Section: Introductionmentioning

confidence: 78%

The Improvement of Coralline-Like ZnGa2O4 by Cocatalysts for the Photocatalytic Degradation of Rhodamine B

et al. 2020

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To date, various methods have been used to synthesize ZnGa 2 O 4 material to promote photodegradation performance. However, cocatalysts, which usually play a crucial role in the photocatalyst system, have not been studied extensively in photocatalytic degradation reactions. In this paper, ZnGa 2 O 4 semiconducting material was synthesized by a traditional high-temperature solid-state reaction. The as-prepared powder was characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), and ultraviolet-visible diffused reflectance spectroscopy. The results indicate that the as-prepared sample is a highly crystallized granular sample with a bandgap of 4.44 eV and a uniform particle size distribution. Density functional theory (DFT) was utilized to calculate the electronic structure of ZnGa 2 O 4 . The valence bands and conduction bands were chiefly composed of O 2p atomic orbitals and the hybridization orbitals of Ga 4s4p and Zn4s4p, respectively. The photocatalytic performance was tested via the decomposition of rhodamine B (RhB) under the irradiation of ultraviolet light. Cu, Ag, Au, Ni, Pt, and Pd cocatalysts were loaded on the ZnGa 2 O 4 photocatalyst by a photodeposition method. The relatively optimal cocatalyst of ZnGa 2 O 4 in the photocatalytic degradation reaction is Au. Thereafter, the effect of loading different usage amounts of the Au cocatalyst for the photodegradation of the ZnGa 2 O 4 photocatalyst was studied in detail. The experimental results displayed that the optimum photodegradation activity was confirmed with the 3 wt% Au/ZnGa 2 O 4 sample, which was 14.1 times more than the unloaded photocatalyst. The maximum photocatalytic degradation ratio of RhB was 96.7%, with 180 min under ultraviolet light.

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Section: Introductionmentioning

confidence: 78%

The Improvement of Coralline-Like ZnGa2O4 by Cocatalysts for the Photocatalytic Degradation of Rhodamine B

et al. 2020

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“… 41 , 42 In the photodegradation reaction, the photocatalyst needs to be recycled during the cycle reaction, which leads to a loss of the photocatalytic material. 43 , 44 However, a Cr-based compound was formed in the photocatalytic reaction, which necessitated a photocatalyst regeneration for the cycle reaction. 18 Figure 7 presents the results of a cyclic experiment over the 3.0%-Au/Sr 0.70 Ce 0.20 WO 4 sample.…”

Section: Results and Discussionmentioning

confidence: 99%

“… 17 To quantitatively assess the photocatalytic reduction performance of the as-prepared samples, the reaction kinetic constants of these reactions were calculated by the first-order model of ln( C 0 / C ) versus time. 4 , 43 …”

Section: Experimental Sectionmentioning

confidence: 99%

Photocatalytic Reduction of Cr(VI) on a 3.0% Au/Sr_0.70Ce_0.20WO₄ Photocatalyst

Yang

Tan

et al. 2020

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Herein, a 3.0%-Au/Sr 0.70 Ce 0.20 WO 4 sample was prepared for the photocatalytic reduction of the Cr 2 O 7 2– ion. The photocatalyst was characterized by X-ray diffraction, scanning electron microscopy, X-ray photoelectron spectroscopy, and ultraviolet–visible diffuse reflectance spectra. The Sr 0.70 Ce 0.20 WO 4 sample presented a photocatalytic reduction activity that is better than those of the Ce-doped sample and the intrinsic sample. Thereafter, different metal elements, Cu, Ag, Au, and Pt, were used as cocatalysts, which were loaded on the Sr 0.70 Ce 0.20 WO 4 sample. The 3.0%-Au/Sr 0.70 Ce 0.20 WO 4 photocatalyst showed optimal photocatalytic reduction activity in a 8 vol % methanol solution (pH = 7) under visible light irradiation. The kinetic constant of the optimal one is 0.0039 min –1 , which is 1.86 times that of the Sr 0.70 Ce 0.20 WO 4 sample. The photocatalyst is stable enough after a 24 h photocatalytic experiment.

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“…Subsequently, the model was self-consistent with the free-radical quenching experiment, which was detected by p-benzoquinone (BQ), disodium ethylenediaminetetraacetate (EDTA-2Na), carotene (CAR) and isopropanol (IPA). [3,[16][17][18] In the free-radical quenching experiment, photo-generated hole (h + ), superoxide anion ( * O 2 À ), singlet oxygen ( 1 O 2 ), and hydroxyl radical ( * OH) all play an important role in the photocatalytic reaction, and the importance of the three is…”

Section: Photocatalytic Mechanism Of Ternary Compositesmentioning

confidence: 99%

“…[1] To enhance the photocatalytic activity, it is often necessary to load cocatalyst, to construct heterojunction, to synthesize composites, and other means to achieve the purpose. [1,2] Loading cocatalyst does not always improving the photocatalytic performance of the original photocatalyst, [3] and this method can be utilized to further improve the performance of heterojunction and composite. [4] There are many kinds of heterojunctions, which require more than two kinds of semiconducting materials to form ohmic-contact, and its synthesis is a challenge.…”

Section: Introductionmentioning

confidence: 99%

C₃N₄/Cu/ZnFe₂O₄ Ternary Nanocomposites: Removal of Environmental Pollutants by the Synergy of Physical Adsorption and Photocatalysis

et al. 2022

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Although binary composites can enhance the separation efficiency of photo-generated carriers to a certain extent, there is still space for further improvement. Here, we focus on using copper, a cheap transition metal, as an electron channel to improve the photo-generated carrier separation efficiency of ZnFe 2 O 4 (ZFO) and C 3 N 4 (CN) composites. The kinetic constants of sample 40 %-ZFO/CN for photodegradation reaction are 2.96 and 1.98 times than that of pure sample ZFO and CN under the same conditions. However, the kinetic constants of 3 % Cu@40 %-ZFO/CN are 7.33 and 4.92 times than that of pure sample ZFO and CN, respectively. This is probably due to the physical adsorption performances of ternary composites for pollutants are significantly stronger than those of binary composites. The best photocatalysts achieved 90 % degradation efficiency within 15 minutes. A more reasonable photocatalytic mechanism model was proposed. Photo-generated hole, superoxide anion, and hydroxyl radical all play an important role in the photocatalytic reaction. The importance of them is superoxide anion > photo-generated hole > singlet oxygen > hydroxyl radical from high to low.

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Highly improved photocatalytic degradation of rhodamine B over Bi₂Ga_4−xFe_xO₉ solid solutions under visible light irradiation

Abstract: In this work, Bi2Ga4−xFexO9 (0 ≤ x ≤ 1.2) solid solutions were prepared via the traditional high-temperature solid-state reaction.

Cited by 8 publications

References 47 publications

The Improvement of Coralline-Like ZnGa2O4 by Cocatalysts for the Photocatalytic Degradation of Rhodamine B

The Improvement of Coralline-Like ZnGa2O4 by Cocatalysts for the Photocatalytic Degradation of Rhodamine B

Photocatalytic Reduction of Cr(VI) on a 3.0% Au/Sr_0.70Ce_0.20WO₄ Photocatalyst

C₃N₄/Cu/ZnFe₂O₄ Ternary Nanocomposites: Removal of Environmental Pollutants by the Synergy of Physical Adsorption and Photocatalysis

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Highly improved photocatalytic degradation of rhodamine B over Bi2Ga4−xFexO9 solid solutions under visible light irradiation

Abstract: In this work, Bi2Ga4−xFexO9 (0 ≤ x ≤ 1.2) solid solutions were prepared via the traditional high-temperature solid-state reaction.

Cited by 8 publications

References 47 publications

The Improvement of Coralline-Like ZnGa2O4 by Cocatalysts for the Photocatalytic Degradation of Rhodamine B

The Improvement of Coralline-Like ZnGa2O4 by Cocatalysts for the Photocatalytic Degradation of Rhodamine B

Photocatalytic Reduction of Cr(VI) on a 3.0% Au/Sr0.70Ce0.20WO4 Photocatalyst

C3N4/Cu/ZnFe2O4 Ternary Nanocomposites: Removal of Environmental Pollutants by the Synergy of Physical Adsorption and Photocatalysis

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Highly improved photocatalytic degradation of rhodamine B over Bi₂Ga_4−xFe_xO₉ solid solutions under visible light irradiation

Photocatalytic Reduction of Cr(VI) on a 3.0% Au/Sr_0.70Ce_0.20WO₄ Photocatalyst

C₃N₄/Cu/ZnFe₂O₄ Ternary Nanocomposites: Removal of Environmental Pollutants by the Synergy of Physical Adsorption and Photocatalysis