Enhanced photocatalytic performance of Ag 2 O/BiOF composite photocatalysts originating from efficient interfacial charge separation

Yang, Mei; Yang, Qi; Zhong, Jianxin; Huang, Shengtian; Li, Jianzhang; Song, Jiabo; Burda, Clemens

doi:10.1016/j.apsusc.2017.04.206

Cited by 53 publications

(10 citation statements)

References 26 publications

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“…Some researchers have synthesized the complex catalysts about BiOF. Yang et al [33,34] prepared the Ag 2 O/BiOF composite photocatalysts through a facile precipitation method and PVA-assisted hydrothermal preparation of BiOF, which improve the 1 3 photocatalytic activity of the BiOF. Jiang et al [35] synthesized BiOBr/BiOF composite photocatalyst through a facile one-step hydrothermal method, with excellent absorption ability and efficient degradation ability for Rhodamine B (RhB) and nitrobenzene under visible light irradiation.…”

Section: Introductionmentioning

confidence: 99%

Ultransonic-assisted alcoholysis preparation of BiOClxBr1−x modified BiOF microstructure with enhanced photocatalytic performance

Han

Qiang

et al. 2019

J Mater Sci: Mater Electron

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A series of BiOF/BiOCl x Br 1−x composites with different BiOF contents have been synthesized by means of ultrasonicassisted alcoholysis for the first time. The as-prepared samples were characterized by such methods as XRD, SEM, TEM, EDS, Mapping, BET, UV-Vis, XPS and PL spectra. The photocatalytic activity of samples under visible-light irradiation was evaluated by the degradation of Rhodamine. The results revealed that BiOF/BiOCl 0.75 Br 0.25 composite exhibited much higher photocatalytic activity than pure BiOF and BiOCl 0.75 Br 0.25 . And the 30%BiOF/BiOCl 0.75 Br 0.25 composite displayed the highest photocatalytic performance, reaching up 97% after irradiating with visible light for 45 min. The improvement of photocatalytic activity could be ascribed to the increased visible light absorption, its larger specific surface area and the enhanced electron-hole pairs effective separation. Moreover, the•O 2 − and h + were considered as the main active species during photocatalytic process. At last, the possible mechanism of the photocatalytic property was proposed in this paper.

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Section: Introductionmentioning

confidence: 99%

Ultransonic-assisted alcoholysis preparation of BiOClxBr1−x modified BiOF microstructure with enhanced photocatalytic performance

Han

Qiang

et al. 2019

J Mater Sci: Mater Electron

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“…Therefore, the focus of most researchers has been to develop highly efficient photocatalyst that are active in the visible light. This research effort has led to the discovery of silver based photocatalyst such as Ag 3 PO 4 [6], Ag 2 O [7], AgCl [8], AgBr [9] and Ag 2 CO 3 [10] as the new generation of visible light active photocatalyst. Ag 2 CO 3 photocatalyst has been reported to be very effective in degrading water soluble dyes [11, 12].…”

Section: Introductionmentioning

confidence: 99%

Ag2CO3-halloysite nanotubes composite with enhanced removal efficiency for water soluble dyes

Nyankson

Agyei‐Tuffour

Annan

et al. 2019

Heliyon

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The release of water soluble dyes into the environment is an utmost concern in many countries. This paper presents the effects of Ag 2 CO 3 -halloysite composites on the efficient removal of water soluble dyes. In this study, NaHCO 3 solution was added dropwisely to halloysite nanotubes (HNTs) dispersed in aqueous AgNO 3 to form Ag 2 CO 3 -HNTs composite. The synthesized Ag 2 CO 3 -HNTs composite was characterized with Diffused Reflectance Spectroscopy (DRS), X-ray Diffraction (XRD), Thermogravimetric analysis (TGA), Scanning Electron Microscopy-Energy Dispersive Spectroscopy (SEM-EDX) and Fourier Transform Infra-Red (FT-IR) spectroscopy. The photocatalytic activity and the adsorption capacity of Ag 2 CO 3 -HNTs on methylene blue and rhodamine b dyes were dependent on pH and the amount of HNTs used in the synthesis. The photodegradation efficiency of Ag 2 CO 3 was lower when compared with that of the composite material. This observation is due to the reduction in the electron-hole recombination with the HNTs acting as electron trapping site and the enhanced aqueous dispersity of Ag 2 CO 3 -HNTs. The enhanced adsorption of water soluble dyes by the Ag 2 CO 3 -HNTs resulted from the electrostatic attraction of cationic dyes to the surface of the HNTs (negatively charged). The Ag 2 CO 3 -HNTs therefore removed dye pollutants through a combination of photocatalytic and adsorption processes. The results obtained during the study confirmed the potential application of Ag 2 CO 3 -HNTs composite in water treatment technologies.

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“…However, under the visible light irradiation, both pristine Bi 2 WO 6 and CuS/Bi 2 WO 6 heterostructure can produce ESR signals (Figure 11). The characteristic signals of DMPO-·OH with a four-line ESR signal, relative intensities of 1:2:2:1, and α H = α N = 1.5 mT (Figure 11a) were observed [43,44]. Similarly, a doublet of triplets ESR signal with relative intensities of 1:1:1:1 characteristic signals of DMPO-·O 2 − (Figure 11b) was also observed [45,46].…”

Section: Resultsmentioning

confidence: 97%

2D In-Plane CuS/Bi2WO6 p-n Heterostructures with Promoted Visible-Light-Driven Photo-Fenton Degradation Performance

et al. 2019

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Photo-Fenton degradation of pollutants in wastewater is an ideal choice for large scale practical applications. Herein, two-dimensional (2D) in-plane CuS/Bi2WO6 p-n heterostructures have been successfully constructed by an in situ assembly strategy and characterized using XRD, XPS, SEM/TEM, EDX, UV-Vis-DRS, PL, TR-PL, ESR, and VB-XPS techniques. The XPS and the TEM results confirm the formation of CuS/Bi2WO6 heterostructures. The as-constructed CuS/Bi2WO6 showed excellent absorption in visible region and superior charge carrier separation efficiency due to the formation of a type-II heterojunctions. Under visible light irradiation, 0.1% CuS/Bi2WO6 heterostructure exhibited the best photo-Fenton-like catalytic performance. The degradation efficiency of Rhodamine B (RhB, 20 mg·L−1) can reach nearly 100% within 25 min, the apparent rate constant (kapp/min−1) is approximately 40.06 and 3.87 times higher than that of pure CuS and Bi2WO6, respectively. The degradation efficiency of tetracycline hydrochloride (TC-HCl, 40mg·L−1) can reach 73% in 50 min by employing 0.1% CuS/Bi2WO6 heterostructure as a photo-Fenton-like catalyst. The promoted photo-Fenton catalytic activity of CuS/Bi2WO6 p-n heterostructures is partly ascribed to its low carriers recombination rate. Importantly, CuS in CuS/Bi2WO6 heterostructures is conducive to the formation of heterogeneous photo-Fenton catalytic system, in which Bi2WO6 provides a strong reaction site for CuS to avoid the loss of Cu2+ in Fenton reaction, resulting in its excellent stability and reusability. The possible photo-Fenton-like catalytic degradation mechanism of RhB and TC-HCl was also elucidated on the basis of energy band structure analysis and radical scavenger experiments. The present study provides strong evidence for CuS/Bi2WO6 heterostructures to be used as promising candidates for photo-Fenton treatment of organic pollutants.

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Enhanced photocatalytic performance of Ag 2 O/BiOF composite photocatalysts originating from efficient interfacial charge separation

Cited by 53 publications

References 26 publications

Ultransonic-assisted alcoholysis preparation of BiOClxBr1−x modified BiOF microstructure with enhanced photocatalytic performance

Ultransonic-assisted alcoholysis preparation of BiOClxBr1−x modified BiOF microstructure with enhanced photocatalytic performance

Ag2CO3-halloysite nanotubes composite with enhanced removal efficiency for water soluble dyes

2D In-Plane CuS/Bi2WO6 p-n Heterostructures with Promoted Visible-Light-Driven Photo-Fenton Degradation Performance

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