Noble metal deposited graphitic carbon nitride based heterojunction photocatalysts

Kavitha, R.; Nithya, P.; Kumar, S. Girish

doi:10.1016/j.apsusc.2019.145142

Cited by 131 publications

(37 citation statements)

References 211 publications

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“…The presence of two types of metal nanoparticles leading to a broad plasmonic absorption in nanohybrids 2 and 3 clearly improved the efficiency of the photodegradations with respect to g-C 3 N 4 . In general, the formation of metal-semiconductor heterojunctions through the grafting of metal NPs at the surface of a semiconductor would increase the photocatalytic efficiency through several paths: (i) the metal NP may act as co-catalyst; (ii) the metal NPs can improve the electron-hole separation acting as electron sinks thanks to the formation of a Schottky barrier between the metal and the semiconductor; and (iii) when the metal NPs display plasmonic properties, the localized surface plasmon resonance (LSPR) induces additional local temperature increase (improves exciton formation in the semiconductor), optical near field enhancement (transfer of photons to the semiconductor) and hot-electron injection from the plasmonic nanoparticle to the conduction band of the semiconductor, preventing a fast electron-hole recombination [ 10 , 11 , 19 ].…”

Section: Resultsmentioning

confidence: 99%

“…A smart approach to overcome these disadvantages consists of the formation or deposition of noble gold (Au) or silver (Ag) or even to a lesser extent bimetallic Au-Ag metal nanoparticles (NPs) on the surface of g-C 3 N 4 nanosheets [ 10 , 11 ]. These hybrid nanosystems constitute a unique challenge in which the catalytic, electronic and optical properties of the metal nanoparticles are combined with the abovementioned ones provided by the g-C 3 N 4 nanosheets.…”

Section: Introductionmentioning

confidence: 99%

“…There are several approaches for the synthesis of metal NPs-g-C 3 N 4 nanohybrids, which include pulsed laser ablation, hydro/solvothermal techniques, microwave assisted synthesis, chemical reduction, wet impregnation/calcination or photodeposition, being the latter the most convenient approach [ 11 ].…”

Section: Introductionmentioning

confidence: 99%

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Combination of Au-Ag Plasmonic Nanoparticles of Varied Compositions with Carbon Nitride for Enhanced Photocatalytic Degradation of Ibuprofen under Visible Light

2021

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Au-Ag/g-C3N4 nanohybrids 2–3 were synthesized by the one-pot self-reduction of the organometallic precursor [Au2Ag2(C6F5)4(OEt2)2]n in the presence of graphitic carbon nitride (g-C3N4), leading to two populations of alloyed Au-Ag nanoparticles (NPs) of different size and composition on the surface of g-C3N4, i.e., Ag-enriched Au-Ag NPs of smaller size and Au-enriched Au-Ag NPs of larger size. The combination of these two types of plasmonic NPs with g-C3N4 semiconductor displays enhanced photocatalytic properties towards the degradation of ibuprofen under visible light by the increased charge carrier separation provided by the inclusion of the plasmonic NPs on g-C3N4.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Combination of Au-Ag Plasmonic Nanoparticles of Varied Compositions with Carbon Nitride for Enhanced Photocatalytic Degradation of Ibuprofen under Visible Light

2021

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“…Various forms have been used to integrate these cocatalysts into photocatalysts. In these cocatalysts, the charge carriers transfer from the valence and conduction bands to the hybrid photocatalyst [46]. The synergistic effects of the hybrid photocatalyst created with the new architecture enable efficient transfer of charge carriers and prevent e -/h + recombination.…”

Section: The Roles Of Cocatalystsmentioning

confidence: 99%

“…This group of new photocatalysts could pave the way for the efficient production of commercial hydrogen. Kavitha et al have reviewed noble metal deposited graphitic carbon nitride (GCN) for various photocatalytic applications [46]. Recently, Passi and Pal have summarized modification strategies including noble metal doping on calcium titanate (CaTiO3) and production of green currency energy [47].…”

Section: Introductionmentioning

confidence: 99%

Hydrogen evolution via noble metals based photocatalysts: A review

et al. 2021

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In recent decades, the use of photocatalysts in the evolution of hydrogen (H2) has received much attention. However, the use of the well-known titanium oxide and another photocatalyst as a base for noble metals is limited due to their major weakness in electron-hole pair separation. The use of cocatalysts can be a good way to overcome this problem and provide better performance for the evolution of hydrogen. In this review, suitable high-efficiency cocatalysts for solar hydrogen production have been thoroughly reviewed. New strategies and solutions were examined in terms of increasing the recombination of charge carriers, designing reactive sites, and enhancing the wavelengths of light absorption. Several new types of cocatalysts based on semiconductors in noble groups and dual metals have been evaluated. It is expected that these photocatalysts will be able to reduce the activation energy of reaction and charge separation. In this regard, the existing views and challenges in the field of photocatalysts are presented. The characteristics of monoatomic photocatalysts are reviewed in this manuscript and the latest advances in this field are summarized. Further, the future trends and upcoming research are also briefly discussed. Finally, this review presents noble metal-based photocatalysts for providing suitable photocatalysts on a larger scale and improving their applicability.

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Dual Photo‐ and Mechanochromisms of Graphitic Carbon Nitride/Polyvinyl Alcohol Film

Smith

Shen

Hou

et al. 2021

Adv Funct Materials

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An adaptable stimuli responsive system is proposed based on defective graphitic carbon nitride (d‐GCN)/polyvinyl alcohol (PVA) composite attached to different substrates. Nitrogen vacancies, introduced during synthesis via potassium doping, act as internal electron donors to enhance the photoreduction of redox dyes for quick reversible photochromism. This system can be applied as visible light responsive rewritable paper that offers high resolution for printed text, rapid activation/recoloration, multicolor functionality, and high cyclability. The defects also inhibit the d‐GCN particle growth resulting in smaller particle sizes over bulk samples, which enable the formation of transparent mechanochromic films. By altering the PVA/d‐GCN ratio in the composites, two mechanical stimuli responses are introduced by taking advantage of wrinkle and crack formation on the film surface. With a low d‐GCN concentration, mechanical scratching of the film causes the formation of surface wrinkles that alter the film transparency without damaging the film, allowing for text to be written on the surface that can be erased by moisture. With a high d‐GCN concentration, cracks developed on the surface scatter light when stretched, enabling the development of a strain dependent smart window. Both these mechanochromisms can be combined with the photochromism to develop multifunctional smart materials with widespread application.

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Noble metal deposited graphitic carbon nitride based heterojunction photocatalysts

Cited by 131 publications

References 211 publications

Combination of Au-Ag Plasmonic Nanoparticles of Varied Compositions with Carbon Nitride for Enhanced Photocatalytic Degradation of Ibuprofen under Visible Light

Combination of Au-Ag Plasmonic Nanoparticles of Varied Compositions with Carbon Nitride for Enhanced Photocatalytic Degradation of Ibuprofen under Visible Light

Hydrogen evolution via noble metals based photocatalysts: A review

Dual Photo‐ and Mechanochromisms of Graphitic Carbon Nitride/Polyvinyl Alcohol Film

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