Photodegradation of Rhodamine B over Ag modified ferroelectric BaTiO<sub>3</sub> under simulated solar light: pathways and mechanism

Cui, Yongfei; Goldup, Stephen M.; Dunn, Steve

doi:10.1039/c5ra00798d

Cited by 70 publications

(43 citation statements)

References 59 publications

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“…The new peaks in the spectrum are associated with the intermediate products formed during degradation. The NMR results further confirmed that the de-ethylation and degradative changes of RhB occurs during the photo degradation processes 32,33 .…”

Section: Resultssupporting

confidence: 64%

Green synthesis of AgI nanoparticle-functionalized reduced graphene oxide aerogels with enhanced catalytic performance and facile recycling

et al. 2015

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AgI nanoparticle-functionalized self-assembled reduced graphene oxide aerogels are constructed using vitamin C as the reducing agent. The obtained aerogels can be used as efficient catalysts for organic dye degradation, reduction of 4nitrophenol, and synthesis of bis(indolyl)methane. A set of characterizations, including FESEM, TEM, XRD, XPS, Raman, FTIR, optical absorption, and photoluminescence techniques, confirm that the aerogel is formed from ultra-dispersed AgI nanocrystals and the self-assembly of reduced graphene oxide nanosheets into porous hydrogel structures. The obtained aerogels exhibit high photocatalytic degradation ability toward an organic dye (Rhodamine-B) because of the high visible light-driven catalytic activity of AgI and the high specific surface area of graphene nanosheets with three-dimensional interconnected pores. The well-wrapped reduced graphene oxide nanosheets on AgI nanostructures could promote the transfer of photo-generated electrons, which not only effectively inhibits the recombination of electrons and holes but also suppresses the photocorrosion of AgI; this promotes the photocatalytic activity and stability. Moreover, these nanostructures show the best catalytic activity for the reduction of 4-nitrophenol to 4-aminophenol in the presence of NaBH4 as a reducing agent. Furthermore, the AgI-reduced graphene oxide aerogel nanocomposites are active catalysts for the synthesis of bis(indolyl)methane under solvent-free conditions. The nanocomposites exhibit excellent catalytic activity and remarkable durability. This study brings a novel approach to the development of multi-responsive reduced graphene oxide aerogels via the co-assembly of various semiconductor nanocomponents for a variety of applications that involve sustained catalytic activity. Electronic Supplementary Information (ESI) available: Experimental and characterizations, Schematic mechanism of the formation of the AgI-graphene hydrogel, EDS and EDS mapping, PL and CIE analysis, BET analysis, UV-visible spectra of the photocatalytic activity, 1 H NMR of RhB with photodegradation time, photocurrent responses and EIS analysis, FESEM, XPS and XRD patterns of the recycled catalysts, 1 H and 13 C NMR spectra of bis(indolyl)methane. See Facile Recycling by D. A. Reddy et al.→ This work demonstrates the facile green synthesis of AgI-reduced graphene oxide aerogels with superior photocatalytic performance and remarkable durability.

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Section: Resultssupporting

confidence: 64%

Green synthesis of AgI nanoparticle-functionalized reduced graphene oxide aerogels with enhanced catalytic performance and facile recycling

et al. 2015

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“…Recent studies comparing the photocatalytic reactivity of BaTiO 3 have shown that tetragonal, ferroelectric BaTiO 3 nanoparticles exhibit signifi cantly higher activities than those observed when the dominant crystal phase is the non-ferroelectric cubic phase. [ 9,22 ] Herein we report an investigation, using TAS, of charge carrier dynamics in a prototypical ferroelectric material: BaTiO 3 . The potential to modulate spontaneous polarization within BaTiO 3 through selection of both crystal structure [ 23 ] and temperature [ 24 ] makes this material an ideal model system to study the impact of the internal fi elds upon charge carrier dynamics.…”

Section: Doi: 101002/adma201601238mentioning

confidence: 99%

Effect of Internal Electric Fields on Charge Carrier Dynamics in a Ferroelectric Material for Solar Energy Conversion

et al. 2016

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“…Although the formed intermediates were not characterized in this work, there is a vast literature exploring different reaction of intermediates from Rhodamine B [40][41][42]. As an example, in recent publication, Cui et al demonstrated that benzoic acid was the major identifiable breakdown intermediate during the photodegradation of Rhodamine B over Ag modified ferroelectric BaTiO 3 under simulated solar light [43].…”

Section: Reusability Of Ce-tio 2 /Diatomite Compositementioning

confidence: 99%

Enhanced photocatalytic properties of reusable TiO 2 -loaded natural porous minerals in dye wastewater purification

et al. 2016

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Diatomite-based recyclable photocatalysts containing single lanthanide doped TiO 2 nanoparticles (NPs) were synthesized by using simple sol-gel method. Photocatalytic activities of the prepared Ce-or La-single doped TiO 2 /diatomite catalysts were estimated by the degradation of Rhodamine B (RhB) under simulated sunlight irradiation. The XRD and Raman spectra shown only anatase phase of TiO 2 for the un-doped and Ce-doped samples. The TEM images revealed uniform distribution of TiO 2 NPs on the matrix, indicating that diatomite played an important role to prevent the agglomeration of TiO 2 NPs. Ce-TiO 2 /diatomite showed a red shift in UV-visible light absorption edge with enhanced absorption intensity than un-doped sample, whereas La-TiO 2 /diatomite showed a blue shift. The bandgap energy of 1.5%-Ce doped sample is as low as 2.75 eV. The XPS spectra showed the presence of both Ce 3+ and Ce 4+ oxidation states for Ce dopant. The photoluminescence spectra of the Ce-doped samples showed first decrease in the recombination centers with the maximum decrease for 1.5%-Ce doped sample and then started increase with the increasing Ce in the samples. As compared to the La-doped samples, a desired behavior was observed for the Ce-doped hybrid due to the redox Ce 4+ /Ce 3+ pairs acting as electron scavengers and localized unoccupied Ce 4f level narrowing the band gap. The incorporation with diatomite as support of TiO 2 nanoparticles is contributed for the improved reusability and also gives a promising strategy to enable the application of nano-photocatalysts in a real wastewater remediation treatment.

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Photodegradation of Rhodamine B over Ag modified ferroelectric BaTiO₃ under simulated solar light: pathways and mechanism

Abstract: Reaction mechanism for RhB degradation over a self-polarised semiconductor, BaTiO3.

Cited by 70 publications

References 59 publications

Green synthesis of AgI nanoparticle-functionalized reduced graphene oxide aerogels with enhanced catalytic performance and facile recycling

Green synthesis of AgI nanoparticle-functionalized reduced graphene oxide aerogels with enhanced catalytic performance and facile recycling

Effect of Internal Electric Fields on Charge Carrier Dynamics in a Ferroelectric Material for Solar Energy Conversion

Enhanced photocatalytic properties of reusable TiO 2 -loaded natural porous minerals in dye wastewater purification

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Photodegradation of Rhodamine B over Ag modified ferroelectric BaTiO3 under simulated solar light: pathways and mechanism

Abstract: Reaction mechanism for RhB degradation over a self-polarised semiconductor, BaTiO3.

Cited by 70 publications

References 59 publications

Green synthesis of AgI nanoparticle-functionalized reduced graphene oxide aerogels with enhanced catalytic performance and facile recycling

Green synthesis of AgI nanoparticle-functionalized reduced graphene oxide aerogels with enhanced catalytic performance and facile recycling

Effect of Internal Electric Fields on Charge Carrier Dynamics in a Ferroelectric Material for Solar Energy Conversion

Enhanced photocatalytic properties of reusable TiO 2 -loaded natural porous minerals in dye wastewater purification

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Photodegradation of Rhodamine B over Ag modified ferroelectric BaTiO₃ under simulated solar light: pathways and mechanism