Plasmon activation versus plasmon quenching on the overall photocatalytic performance of Ag/Au bimetal decorated g-C3N4 nanosheets under selective photoexcitation: A mechanistic understanding with experiment and theory

Kashyap, Trishamoni; Biswas, Sritam; Ahmed, Shahnaz; Kalita, Dhrubajyoti; Nath, Pabitra; Choudhury, Biswajit

doi:10.1016/j.apcatb.2021.120614

Cited by 51 publications

(23 citation statements)

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“…04-0784). 37 The average crystallite sizes are 8 nm for CeO 2 and 20 nm for Au NP in Au−CeO 2 based on Scherrer's formula. 36 TEM image of pristine CeO 2 (Figure 1b) measures an average particle size of 8 nm (inset of Figure 1b).…”

Section: ■ Results and Discussionmentioning

confidence: 99%

“…36 Au−CeO 2 has a smaller surface area and pore size than pristine CeO 2 NPs. 37 We have also performed zeta-potential measurements of the synthesized CeO 2 , Au NPs, and Au−CeO 2 at pH ∼ 7. We have found that the ξ values are more negative for Au−CeO 2 (ξ = −34.6 mV) compared to CeO 2 (ξ = −14 mV) and Au NPs (ξ = −13.2 mV) (Figure S6).…”

Section: ■ Results and Discussionmentioning

confidence: 99%

“…Figure 2a shows the asymmetric υ as (−COO − ) and symmetric υ s (−COO − ) stretching peaks at 1638 and 1382 cm −1 , respectively. 37,38 The presence of these peaks infers that the citrate ligand binds with the Au surface (Au δ+ −COO − ) by sharing one or more electrons. 39 In pristine CeO 2 , the vibrational frequencies between 1300 and 1630 cm −1 are due to the adsorbed CO 2 (CeO 2 −COO − ).…”

Section: ■ Results and Discussionmentioning

confidence: 99%

“…36 The synthesis of Au−CeO 2 follows a citrate (cit) reduction method in an alkaline medium. 37 The Au 3+ precursor concentrations in the synthesis are 0.2, 0.5, 0.75, and 1 mM. CeO 2 is pale yellow, whereas Au−CeO 2 attains a purple color (Figure S1).…”

Section: ■ Experimental Methodsmentioning

confidence: 99%

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Synergy of Adsorption and Plasmonic Photocatalysis in the Au–CeO₂ Nanosystem: Experimental Validation and Plasmonic Modeling

et al. 2022

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Adsorption-mediated water treatment leaves adsorbents as secondary pollutants in the environment. However, photocatalysis aids in decomposing the contaminant into its nontoxic forms. In this context, we demonstrate an adsorption−photocatalysis pairing in Au− CeO 2 nanocomposites for a total methylene blue (MB) removal from water. We synthesized Au−CeO 2 through the citrate (cit) reduction method at different Au loading and studied its adsorption capacity with kinetics and thermodynamic models. We observe that the high adsorption capacity of Au−CeO 2 is primarily because of the presence of Ce 3+ states in CeO 2 and citrate ligands on Au NPs. The Ce 3+ states interact and transfer their electrons to supported Au NPs, rendering a negative charge over Au. The negatively charged Au surface and the carboxyl (−COO − ) group of citrate ligands mediate an electrostatic interaction/adsorption of cationic MB. The total removal of MB is expedited under white light and lasers. A control experiment with Au NPs shows less adsorption−photocatalysis. The size of Au NPs and Au−CeO 2 interfacial interaction is responsible for the surface plasmon resonance spectral position at 550−600 nm. Linear sweep voltammetry (LSV) and plasmonic field simulation show surface plasmon-driven photocatalysis in Au−CeO 2 . LSV shows a 3-fold higher photocurrent density in Au− CeO 2 than colloidal Au NPs under white light. The simulated electric field intensity in Au−CeO 2 is maximum at SPR excitation and the closest interfacial separation (d = 0 nm). The plasmon-driven photocatalysis in colloidal Au NPs is mainly due to the interaction of hot electrons with the adsorbed MB molecule. Notably, near-field light concentration, hot electrons, and interfacial charge separation are responsible for excellent MB removal in the Au−CeO 2 nanosystem. The total MB removal through adsorption− photocatalysis pairing is 99.3% (Au−CeO 2 ), 30.7% (Au NPs), and 13% (CeO 2 ).

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Section: ■ Results and Discussionmentioning

confidence: 99%

Section: ■ Results and Discussionmentioning

confidence: 99%

Section: ■ Results and Discussionmentioning

confidence: 99%

Section: ■ Experimental Methodsmentioning

confidence: 99%

See 2 more Smart Citations

Synergy of Adsorption and Plasmonic Photocatalysis in the Au–CeO₂ Nanosystem: Experimental Validation and Plasmonic Modeling

et al. 2022

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“…To separate two metal-based semiconductors with acceptable topologies, nanostructures, g-C 3 N 4 , and nano ranged thick polyheptazine films were typically employed. There is a significant demand for exfoliated g-C 3 N 4 and its analogs to form quickly in extended surfaces, such as 2D g-C 3 N 4 (two-dimensional graphitic-carbon nitrides) and 3D g-C 3 N 4 sheets [23]. Since doped concepts could be utilized to change the structural and electrical framework of these nanomaterials, a considerable of studies have been carried out in this area [24,25].…”

Section: Characteristics and Importance Of Spr And 2d Cnsmentioning

confidence: 99%

Plasmon Inspired 2D Carbon Nitrides: Structural, Optical and Surface Characteristics for Improved Biomedical Applications

et al. 2022

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In the past few years, noble metal-based 2D nanomaterials particularly Ag and Au enriched carbon nitrides have seen advanced catalytic actions and reactivity. These composite nanostructures’ chemical and physical characteristics have been applied to improve the targeted functionalities in healthcare and medical sciences. Many scientists and experts were inspired to study their foundational technologies in the medicinal industries via architectural and surface modifications by doping of noble nanoparticles. Here, we have provided fundamental ideas for structuring Ag and Au decorated CNs (carbon nitrides) by studying their morphological and modified surface properties for biomedical applications. There is a vast spectrum of publications that discusses the peculiarities of CNs and noble metal’s key discoveries. The impact of surface plasmons resonance (SPR) is an essential factor for noble metals and that is why it is focused extensively for better performance in biomedical sectors. The elemental combinations on the CNs surfaces and their morphological status were found to be much more efficient which is broadly discussed. The fabrication techniques, structural characterizations, and SPR role of Ag and Au are addressed including fundamental concepts followed by many suitable examples under this review.

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Insights into Molten Salts Induced Structural Defects in Graphitic Carbon Nitrides for Piezo‐Photocatalysis with Multiple H₂O₂ Production Channels

Ly,

Nguyen,

Luu

et al. 2023

Advanced Sustainable Systems

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Elucidating the impact of heteroatoms in graphitic carbon nitrides (g‐C3N4) is of utmost importance to rationalize materials. Hence, in this study, oxygen‐doped g‐C3N4 containing trace amounts of halogen in the structures for piezo‐photosynthesis of hydrogen peroxides (H2O2) is fabricated. The findings reveal that oxygen atoms may be inserted into g‐C3N4 in‐plane structures, while halogen atoms tend to become intercalated between g‐C3N4 layers. Furthermore, the presence of ammonium molten salts (NH4X) during the synthesis alters the concentration of mono and cluster vacancies of carbon and nitrogen in the materials, certifying by positron annihilation spectroscopy (PAS). These defective contributions will be meaningfully accelerate catalytic performance by providing trapping states. Additionally, the decomposition of generated H2O2 can produce highly oxidative hydroxyl radicals, inducing degradations on the catalyst's structures and unexpectedly decreasing catalytic outcomes. From the mechanistic view, different reduction and oxidation channels will be play a pivotal role in generating H2O2. Moreover, the influence of ultrasound and light is also carefully investigated in the work to gain more insights into how the catalysts are triggered to improve catalytic performance. Thus, this study highlights the importance of carefully characterizing structures of g‐C3N4 to precisely understand the catalytic properties, benefiting catalytic design and development.

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Plasmon activation versus plasmon quenching on the overall photocatalytic performance of Ag/Au bimetal decorated g-C3N4 nanosheets under selective photoexcitation: A mechanistic understanding with experiment and theory

Cited by 51 publications

References 56 publications

Synergy of Adsorption and Plasmonic Photocatalysis in the Au–CeO₂ Nanosystem: Experimental Validation and Plasmonic Modeling

Synergy of Adsorption and Plasmonic Photocatalysis in the Au–CeO₂ Nanosystem: Experimental Validation and Plasmonic Modeling

Plasmon Inspired 2D Carbon Nitrides: Structural, Optical and Surface Characteristics for Improved Biomedical Applications

Insights into Molten Salts Induced Structural Defects in Graphitic Carbon Nitrides for Piezo‐Photocatalysis with Multiple H₂O₂ Production Channels

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Plasmon activation versus plasmon quenching on the overall photocatalytic performance of Ag/Au bimetal decorated g-C3N4 nanosheets under selective photoexcitation: A mechanistic understanding with experiment and theory

Cited by 51 publications

References 56 publications

Synergy of Adsorption and Plasmonic Photocatalysis in the Au–CeO2 Nanosystem: Experimental Validation and Plasmonic Modeling

Synergy of Adsorption and Plasmonic Photocatalysis in the Au–CeO2 Nanosystem: Experimental Validation and Plasmonic Modeling

Plasmon Inspired 2D Carbon Nitrides: Structural, Optical and Surface Characteristics for Improved Biomedical Applications

Insights into Molten Salts Induced Structural Defects in Graphitic Carbon Nitrides for Piezo‐Photocatalysis with Multiple H2O2 Production Channels

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Product

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Synergy of Adsorption and Plasmonic Photocatalysis in the Au–CeO₂ Nanosystem: Experimental Validation and Plasmonic Modeling

Synergy of Adsorption and Plasmonic Photocatalysis in the Au–CeO₂ Nanosystem: Experimental Validation and Plasmonic Modeling

Insights into Molten Salts Induced Structural Defects in Graphitic Carbon Nitrides for Piezo‐Photocatalysis with Multiple H₂O₂ Production Channels