Crystalline phases and photocatalytic activities of hydrothermal synthesis Ag3VO4 and Ag4V2O7 under visible light irradiation

Huang, Chao-Ming; Pan, Guan‐Ting; Li, Yu-Chu M.; Li, Min-Hsing; Yang, Thomas C.-K.

doi:10.1016/j.apcata.2009.02.007

Cited by 96 publications

(46 citation statements)

References 28 publications

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“…Figure 1a shows the XRD patterns of as-received, fifth, and tenth run reused Fe 78 Si 9 B 13 ribbons. As can be seen, all the XRD patterns present a broad diffraction peak at a range of 2θ = 40-60 • , indicating that they are mainly composed of the amorphous phase [53][54][55][56][57]. Clearly, the maximum diffraction peaks at 2θ = 52.6 • and 95.7 • exhibit a higher diffraction intensity with the increased reused times, which is because crystallized α-Fe is gradually formed on the surface of the Fe 78 Si 9 B 13 ribbons during NGB degradation process under the UV-vis irradiation [58,59].…”

Section: Methodsmentioning

confidence: 95%

Excellent Performance of Fe78Si9B13 Metallic Glass for Activating Peroxymonosulfate in Degradation of Naphthol Green B

Xue-fen

Liang

et al. 2017

Metals

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Abstract:The functional application of metallic glasses in the catalytic field has widely attracted research attention due to its unique atomic structure compared to crystalline materials. It has been reported that metallic glasses can effectively activate H 2 O 2 and persulfate, yet the activation of peroxymonosulfate by metallic glasses is not studied well. In this work, the metallic glass with atomic composition of Fe 78 Si 9 B 13 was applied for investigating the peroxymonosulfate (PMS) activation on degradation of naphthol green B (NGB) dye. The change of surface morphology indicated the important role of oxide films during the dye degradation. The effects and first-order kinetics model of various reaction parameters were evaluated systematically, including PMS concentration, catalyst dosage, irradiation intensity, and dye concentration. The results showed that about 98% of the dye removal rate could be achieved only within 10 min under rational conditions. The reaction kinetics k of 0.1339 min −1 without ribbons was sharply improved to 0.3140 min −1 by adding 0.5 g/L ribbons, indicating the superior activation ability of Fe 78 Si 9 B 13 metallic glass. The recycling experiment revealed that the Fe 78 Si 9 B 13 ribbons exhibited the excellent surface stability and catalytic reusability for activating PMS even after reused for 10th run.

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Section: Methodsmentioning

confidence: 95%

Excellent Performance of Fe78Si9B13 Metallic Glass for Activating Peroxymonosulfate in Degradation of Naphthol Green B

Xue-fen

Liang

et al. 2017

Metals

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“…Owing to the shape of the DRS-UV-vis spectra of both silver vanadates, the band gap was estimated from the onset of the absorption edges (Table 1) [18]. The values calculated by the edge extrapolation are 2.26 and 1.95 eV for AgVO 3 and Ag 3 VO 4 respectively, slightly lower than the values reported by other authors [6,18] but adequate for visible-light driven photocatalysis. X-ray photoelectron spectroscopy has been used to study the surface element composition of the catalysts.…”

Section: Synthesis and Characterization Of Silver Vanadatesmentioning

confidence: 66%

“…In conclusion, although the original catalyst is modified during the reaction it describes high photocatalytic activity. In our work, unfortunately, the preparation of Ag 4 V 2 O 7 by microemulsion methodology was not possible, but it has been reported that this pyrovanadate is photoactive under visible light [6]. In our case, although the Ag 3 VO 4 is modified during reaction, the formation of pyrovanadate active phase and the presence of Ag 2 O/Ag 0 couple appear as the synergistic combination responsible of achieving a highly active system upon visible light excitation.…”

Section: Characterization Of the Used Silver Vanadates After Reactionmentioning

confidence: 82%

“…Different routes to obtain silver vanadates have been reported avoiding the solid-state reaction route that requires high temperatures. For instance, highlight the hydrothermal, microwave-assisted or sonochemical methodologies [6,7], and more recently the preparation of hybrids, composites or thin films [8,9]. However, it is difficult to find a single suitable way for performing various metallates with different structure.…”

Section: Introductionmentioning

confidence: 99%

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Photocatalytic behavior of silver vanadates: Microemulsion synthesis and post-reaction characterization

Belver

Adán

García-Rodríguez

et al. 2013

Chemical Engineering Journal

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h i g h l i g h t s" Silver vanadates were synthesized by microemulsion methodology not exceeding 110°C. " Silver metallic nanoparticles decorated the surface of the silver vanadates. " The photocatalytic properties were studied upon visible light. " The stability of catalysts was evaluated after reaction. " We report a synergistic effect between Ag 0 particles and silver vanadates. a r t i c l e i n f oArticle history: Available online 5 December 2012 Keywords:Silver vanadates Visible-light-driven photocatalysts Used-catalysts characterization Dye photodegradation a b s t r a c tSilver vanadates with light absorption properties in the visible region were successfully prepared by a low temperature pathway (not exceeding 110°C) using an optimized microemulsion methodology. The resulting materials were evaluated as photocatalysts in Rhodamine B photodegradation and characterized before and after reaction. The silver vanadates displayed silver metallic nanoparticles decorating the surface. The as-prepared Ag 3 VO 4 catalyst was the most active. Nevertheless, this silver vanadate suffered important changes during reaction. The initial structure evolves yielding a silver pyrovanadate, Ag 4-V 2 O 7 , with a concomitant increase of the number and size of the silver metallic nanoparticles. The synergy between these Ag 0 particles and the photoactivity of the Ag 4 V 2 O 7 phase seems responsible of the high photoactivity of this material.

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“…The hybridization of the O 2p 6 orbitals with the completely filled 4d 10 orbitals of silver ions could form a VB at a more positive energy level than that of O 2p 6 , resulting in a narrowed band gap. On the other hand, the bottom of the conduction band consists of relatively delocalized s and/or p orbitals, which are largely dispersed and can accommodate high photogenerated electrons and holes mobility, resulting in enhancement of photocatalytic activity [27].…”

Section: Characterizationmentioning

confidence: 99%

Photocatalytic degradation and antibacterial investigation of nano synthesized Ag₃VO₄particles @PAN nanofibers

Saud¹,

Ghouri²,

Pant³

et al. 2016

Carbon letters

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Well-dispersed Ag 3 VO 4 nanoparticles @polyacrylonitrile (PAN) nanofibers were synthesized by an easily controlled, template-free method as a photo-catalyst for the degradation of methylene blue. Their structural, optical, and photocatalytic properties have been studied by X-ray diffraction, transmission electron microscopy, field-emission scanning electron microscopy equipped with rapid energy dispersive analysis of X-ray, photoluminescence, and ultraviolet-visible spectroscopy. The characterization procedures revealed that the obtained material is PAN nanofibers decorated by Ag 3 VO 4 nanoparticles. Photocatalytic degradation of methylene blue investigated in an aqueous solution under irradiation showed 99% degradation of the dye within 75 min. Finally, the antibacterial performance of Ag 3 VO 4 nanoparticles @PAN composite nanofibers was experimentally verified by the destruction of Escherichia coli. These results suggest that the developed inexpensive and functional nanomaterials can serve as a non-precious catalyst for environmental applications.

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Crystalline phases and photocatalytic activities of hydrothermal synthesis Ag3VO4 and Ag4V2O7 under visible light irradiation

Cited by 96 publications

References 28 publications

Excellent Performance of Fe78Si9B13 Metallic Glass for Activating Peroxymonosulfate in Degradation of Naphthol Green B

Excellent Performance of Fe78Si9B13 Metallic Glass for Activating Peroxymonosulfate in Degradation of Naphthol Green B

Photocatalytic behavior of silver vanadates: Microemulsion synthesis and post-reaction characterization

Photocatalytic degradation and antibacterial investigation of nano synthesized Ag₃VO₄particles @PAN nanofibers

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Crystalline phases and photocatalytic activities of hydrothermal synthesis Ag3VO4 and Ag4V2O7 under visible light irradiation

Cited by 96 publications

References 28 publications

Excellent Performance of Fe78Si9B13 Metallic Glass for Activating Peroxymonosulfate in Degradation of Naphthol Green B

Excellent Performance of Fe78Si9B13 Metallic Glass for Activating Peroxymonosulfate in Degradation of Naphthol Green B

Photocatalytic behavior of silver vanadates: Microemulsion synthesis and post-reaction characterization

Photocatalytic degradation and antibacterial investigation of nano synthesized Ag3VO4particles @PAN nanofibers

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Photocatalytic degradation and antibacterial investigation of nano synthesized Ag₃VO₄particles @PAN nanofibers