“…This reveals that the construction of heterojunction between BiFeO 3 and Ag 3 PO 4 is necessary for the enhancement of photocatalytic activity. Moreover, compared with BiFeO 3 /a-Fe 2 O 3 and BiFeO 3 -Bi 2 WO 6 composites [26, 29], the Ag 3 PO 4 /BiFeO 3 heterojunction composites prepared in the present study manifest a higher photocatalytic activity toward the dye degradation.Fig. 5Photocatalytic activities of BiFeO 3 and Ag 3 PO 4 /BiFeO 3 composites toward the degradation of AO7 under visible-light irradiation, along with the blank and absorption experiment results…”
Section: Resultsmentioning
confidence: 64%
“…Fortunately, it is demonstrated that coupling of BiFeO 3 with a narrow-bandgap semiconductor of matched band edge potentials to form a heterojunction is one of the most promising strategies to promote the separation of photogenerated charges, thus leading to improved photocatalytic activity of BiFeO 3 [26–31]. For example, Chaiwichian et al reported that BiFeO 3 -Bi 2 WO 6 nanocomposites exhibited enhanced activity in dye degradation [29]. Wang et al observed that AgCl/Ag/BiFeO 3 showed much higher visible-light photocatalytic activity than bare BiFeO 3 [30].…”
In this work, Ag3PO4 microparticles were decorated onto the surface of BiFeO3 microcuboids through a precipitation method to obtain p-Ag3PO4/n-BiFeO3 heterojunction composites. The composites were employed for the degradation of acid orange 7 (AO7) under visible-light irradiation. It is found that the composites exhibit much higher photocatalytic efficiency than bare BiFeO3. Meanwhile, the intrinsical visible-light-driven photocatalytic activity of Ag3PO4/BiFeO3 composites was further confirmed by the degradation of phenol. In addition, the photo-Fenton-like catalysis property of the composite was also evaluated. The photocurrent analysis indicates that the combination of BiFeO3 with Ag3PO4 leads to the inhibition of recombination of photoinduced electrons and holes. The obvious enhancement in the photocatalytic activity of the composite is mainly ascribed to the efficient photogenerated charge separation and interfacial charge migration caused by the formation of Ag3PO4/BiFeO3 p-n heterojunctions.
“…This reveals that the construction of heterojunction between BiFeO 3 and Ag 3 PO 4 is necessary for the enhancement of photocatalytic activity. Moreover, compared with BiFeO 3 /a-Fe 2 O 3 and BiFeO 3 -Bi 2 WO 6 composites [26, 29], the Ag 3 PO 4 /BiFeO 3 heterojunction composites prepared in the present study manifest a higher photocatalytic activity toward the dye degradation.Fig. 5Photocatalytic activities of BiFeO 3 and Ag 3 PO 4 /BiFeO 3 composites toward the degradation of AO7 under visible-light irradiation, along with the blank and absorption experiment results…”
Section: Resultsmentioning
confidence: 64%
“…Fortunately, it is demonstrated that coupling of BiFeO 3 with a narrow-bandgap semiconductor of matched band edge potentials to form a heterojunction is one of the most promising strategies to promote the separation of photogenerated charges, thus leading to improved photocatalytic activity of BiFeO 3 [26–31]. For example, Chaiwichian et al reported that BiFeO 3 -Bi 2 WO 6 nanocomposites exhibited enhanced activity in dye degradation [29]. Wang et al observed that AgCl/Ag/BiFeO 3 showed much higher visible-light photocatalytic activity than bare BiFeO 3 [30].…”
In this work, Ag3PO4 microparticles were decorated onto the surface of BiFeO3 microcuboids through a precipitation method to obtain p-Ag3PO4/n-BiFeO3 heterojunction composites. The composites were employed for the degradation of acid orange 7 (AO7) under visible-light irradiation. It is found that the composites exhibit much higher photocatalytic efficiency than bare BiFeO3. Meanwhile, the intrinsical visible-light-driven photocatalytic activity of Ag3PO4/BiFeO3 composites was further confirmed by the degradation of phenol. In addition, the photo-Fenton-like catalysis property of the composite was also evaluated. The photocurrent analysis indicates that the combination of BiFeO3 with Ag3PO4 leads to the inhibition of recombination of photoinduced electrons and holes. The obvious enhancement in the photocatalytic activity of the composite is mainly ascribed to the efficient photogenerated charge separation and interfacial charge migration caused by the formation of Ag3PO4/BiFeO3 p-n heterojunctions.
“…heterostructures (Abraham et al 2020;Azmy et al 2017;Chaiwichian et al 2017;Huo et al 2010;Li et al 2013Karamian and Sharifnia 2018;Kolivand and Sharifnia 2021;Shahid et al 2022). The sharp diffraction peaks of both constituent nanostructures of BFO and ZnO are observable in the XRD pattern of the prepared ZnO-BFO in three ratios of ZB21, ZB12, and ZB11, indicating the co-existence of these two phases.…”
Section: Results Of Photocatalyst Characterisationmentioning
Box-Behnken experimental design was utilized to model and optimize the photocatalytic removal of methylene blue (MB) using ZnO-BiFeO3 composite under visible light (LED). Three catalysts with different ZnO: BiFeO3 molar ratios (2:1, 1:2, and 1:1) were synthesized successfully using hydrothermal method. The synthesized photocatalysts were characterized by XRD, FESEM, EDX, PL, FTIR, and UV-vis. FESEM showed the uniform distribution of ZnO particles over the surface of bigger BiFeO3 particles. The best photocatalytic activity was obtained by ZnO-BiFeO3 with 2:1 molar ratio. In order to optimize the experimental conditions, four factors of initial MB concentration (5 to 20 mg/L), pH (3 to 12), catalyst dosage (0.5 to 1.25 mg/L) and light intensity (4 to 18 W) were selected as independent input variables. BBD suggested a quadratic polynomial equation to fit the experimental data. Results of ANOVA confirmed the goodness of fit for the suggested model (predicted- and adjusted-R2 0.99). The optimum conditions for maximizing the photocatalytic MB degradation were found to be initial MB concentration of 11 mg/L, pH of 11.7, catalyst dosage of 0.716 mg/L, and light intensity of 11.4 W. Under the optimum conditions, the highest photocatalytic MB degradation of 62.9% was obtained which is in reasonable agreement with the predicted value of 69%.
“…Figure 4(f) showed the O 1s spectra. The spectrum located at 530.8 eV, which is attributed to element O in [Bi 2 O 2 ] 21 (Chaiwichian et al, 2017). The minimum detection limitation of XPS analysis is more than 0.1%, which has the relatively high sensitivity.…”
Purpose
The purpose of this paper is to improve the degradation efficiency of Rhodamine B (RhB) by new photocatalytic materials.
Design/methodology/approach
Binary Z-scheme g-C3N4/Bi2WO6 photocatalytic material was synthesized by the one-step hydrothermal reaction. The construction of Z-scheme heterojunction led to the rapid separation of photogenerated electrons and holes, which would degrade RhB into small molecular substances to achieve the purpose of degradation.
Findings
It was found that Bi2WO6/25%g-C3N4 displayed the highest photocatalytic activity, which was about 1.44 and 1.34 times higher than that of pure Bi2WO6 and g-C3N4, respectively. According to the trapping experiments, the superoxide radical (·O2−) was the major active species of the RhB decomposition in Bi2WO6/g-C3N4 catalysts.
Originality/value
The successful synthesis of Z-scheme Bi2WO6/g-C3N4 provides new ideas and references for the design of catalysts with high photocatalytic activity, which should have wide applications in the future.
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