Construction of Conjugated Carbon Nitride Nanoarchitectures in Solution at Low Temperatures for Photoredox Catalysis

Cui, Yanjuan; Ding, Zhengxin; Fu, Xianzhi; Wang, Xinchen

doi:10.1002/anie.201206534

Cited by 541 publications

(283 citation statements)

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“…The core-shell NPs were denoted as Ag@SiO 2 -X (X = 8, 12, 17, 21), where X represents the thickness of the SiO 2 shell (i.e., the nanogap width between Ag NPs and g-C 3 N 4 ). Ag or Ag@SiO 2 NPs were then loaded on g-C 3 N 4 by a one-pot annealing method (Step III) and the as-prepared photocatalysts were denoted as g-C 3 N 4 /Ag or g-C 3 N 4 /Ag@SiO 2 -X (X = 8, 12,17,21).…”

Section: Resultsmentioning

confidence: 99%

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Nanogap Engineered Plasmon‐Enhancement in Photocatalytic Solar Hydrogen Conversion

Chen

Dong

et al. 2015

Adv Materials Inter

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of pure g-C 3 N 4 for hydrogen production was relatively low, although the band gap ( E g ≈ 2.7 eV) and band positions of g-C 3 N 4 match well with the intrinsic requisites for photocatalytic water splitting under visible light. [ 6,8 ] To this end, previous attempts have been mainly focused on improving charge carrier migration and separation in g-C 3 N 4 via three aspects: (1) constructing band structure aligned heterojunctions between g-C 3 N 4 and other semiconductor photocatalysts (Cu 2 O, [ 10 ] N-CeO x , [ 11 ] ZnFe 2 O 4 , [ 12 ] CNS, [ 13 ] etc.) for effi cient charge separation, (2) combining g-C 3 N 4 with conductive materials (graphene, [ 14 ] CNTs, [ 15 ] etc.), and (3) designing unique nanostructures (nanorods, [ 16,17 ] nanosheets, [ 18,19 ] mesoporous nanostructures, [20][21][22] etc.) for fast charge carrier migration. However, the photocatalytic effi ciencies of these modifi ed g-C 3 N 4 were still not high enough for practical applications in effi cient solar energy conversion systems.It has been well established that the mismatch between the relatively long penetration depth of photons and the short mean free path of charge carriers signifi cantly account for the high-rate recombination of electrons and holes in semiconductors. [ 23,24 ] Therefore, the charge carrier recombination could be effectively inhibited if the travel distance for charge carriers to transfer to the surface active sites is minimized. Recent development of photocatalysts modifi ed with plasmonic nanostructures of noble metals (such as Au, [25][26][27][28] Ag, [ 29,30 ] etc.) offered a new opportunity to fulfi ll this strategy. These metal nanoparticles (NPs) characteristic of the localized surface plasmon resonance (LSPR) effect can act as nanoantennas for light trapping and form a locally enhanced electromagnetic fi eld in the proximity of the metal NPs. Under irradiation, especially when the LSPR absorption of the metal NPs is partially overlapped with the optical absorption of the semiconductor, [31][32][33] the LSPR induced plasmon resonance energy transfer (PRET) from the plasmonic metal to the nearby semiconductor will preferentially excite charge carriers in the metal/semiconductor interface, namely, the near-surface region of the semiconductor. Then the transfer distance of the photoexcited charge carriers to the surface reactive sites for photocatalytic reactions would be shortened. Watanabe and co-workers demonstrated that the enhanced photocatalytic activity over Ag NPs incorporated TiO 2 photocatalyst was achieved by the LSPR induced electromagnetic fi eld amplitude of Ag NPs. [ 34 ] The consequent PRET effect favored the charge carrier formation in the near-surface region of TiO 2 , thus the

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Section: Resultsmentioning

confidence: 99%

“…for effi cient charge separation, (2) combining g-C 3 N 4 with conductive materials (graphene, [ 14 ] CNTs, [ 15 ] etc. ), and (3) designing unique nanostructures (nanorods, [ 16,17 ] nanosheets, [ 18,19 ] mesoporous nanostructures, [20][21][22] etc.) for fast charge carrier migration.…”

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confidence: 99%

Nanogap Engineered Plasmon‐Enhancement in Photocatalytic Solar Hydrogen Conversion

Chen

Dong

et al. 2015

Adv Materials Inter

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“…All signals of C, N, Ag, P, and O were detected in the Ag3PO4/g-C3N4 composite, which is consistent with the XRD and FTIR results. The typical high-resolution XPS spectra of C 1s, Ag 3d, and P 2d in the composite are shown in Figure 4b-d. C 1s has two peaks at 284.6 and 287.4 eV that are separately attributed to the adventitious carbon and the sp 2 -hybridized C of N-C=N in g-C3N4 [41,42]. The Ag 3d5/2 and 3d3/2 of Ag3PO4 were Surface chemical states of the Ag3PO4/g-C3N4 composite were studied by XPS.…”

Section: Structure and Composition Of Ag3po4/g-c3n4 Photocatalystsmentioning

confidence: 99%

Synthesis of Ag3PO4/G-C3N4 Composite with Enhanced Photocatalytic Performance for the Photodegradation of Diclofenac under Visible Light Irradiation

et al. 2018

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Abstract:A new visible-light-driven heterojunction Ag 3 PO 4 /g-C 3 N 4 was prepared by a simple deposition-precipitation method for the degradation analysis of diclofenac (DCF), a model drug component, under visible-light irradiation. The heterojunction photocatalysts were characterized by a suite of tools. The results revealed that the introduction of Ag 3 PO 4 on the surface of g-C 3 N 4 greatly promoted its stability and light absorption performance. In addition, the effects of the heterojunction mixing ratios were studied, when the molar ratio of Ag 3 PO 4 to g-C 3 N 4 in the composite was 30%, the as-prepared photocatalyst Ag 3 PO 4 /g-C 3 N 4 (30%) possessed the best photocatalytic activity toward the photodegradation of DCF, and the optimal photocatalyst showed a DCF degradation rate of 0.453 min −1 , which was almost 34.8 and 6.4 times higher than those of pure g-C 3 N 4 (0.013 min −1 ) and Ag 3 PO 4 (0.071 min −1 ) under visible light irradiation (λ ≥ 400 nm). The trapping experimental results showed that h + , ·OH, and ·O 2 − were the main reactive oxygen species during the photocatalytic reaction. The improved performance of the composites was induced by the high charge separation efficiency of the photogeneration electron-hole pairs as well as the surface plasmon resonance (SPR) endowed in the Ag 0 nanoparticles, and ultimately enhanced the DCF photodegradation.

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“…As a sustainable material, graphitic carbon nitride (g-C 3 N 4 ) represents an attractive visible light photocatalyst because of its suitable band gap (2.7 eV) for sunlight absorption and outstanding catalytic activity [9]. The high chemical stability of g-C 3 N 4 together with the low cost of mass production makes it an ideal candidate for applications like photocatalytic water splitting, CO 2 reduction and pollutant degradation [10][11][12][13][14]. However, despite great progress in g-C 3 N 4 synthesis, the weak van der Waals interactions between adjacent CN layers in widely used as light absorbers to couple with semiconductor nanoparticles, such as TiO 2 , Si and Ag 3 PO 4 , to improve their photocatalytic performance [26][27][28].…”

Section: Introductionmentioning

confidence: 99%

Carbon dots decorated graphitic carbon nitride as an efficient metal-free photocatalyst for phenol degradation

Zhang

Zhao

Geng

et al. 2016

Applied Catalysis B: Environmental

335

106

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a b s t r a c tEnvironment-friendly metal-free photocatalysts represent a promising alternative to conventional metal-based semiconductors. In this report, a carbon dots (CDs) decorated graphitic carbon nitride (g-C 3 N 4 ) photocatalyst was synthesized via a facile impregnation-thermal method. Under visible light irradiation, a very low CDs content of 0.5 wt% in the g-C 3 N 4 /CDs composite resulted in a 3.7 times faster reaction rate for phenol photodegradation than pristine g-C 3 N 4 . Spectroscopic and photoelectrochemical characterizations revealed that impregnation of CDs into g-C 3 N 4 not only enhanced the production of photogenerated electron-hole pairs by extending the visible light absorption region due to the upconverted photoluminescence character of CDs, but also facilitated electron-hole separation by band alignment in the g-C 3 N 4 /CDs junction, thus yielded more holes,• O 2 and • OH radicals to promote phenol degradation. These results highlight the potential application of sustainable metal-free photocatalysts in water purification.

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Construction of Conjugated Carbon Nitride Nanoarchitectures in Solution at Low Temperatures for Photoredox Catalysis

Cited by 541 publications

References 50 publications

Nanogap Engineered Plasmon‐Enhancement in Photocatalytic Solar Hydrogen Conversion

Nanogap Engineered Plasmon‐Enhancement in Photocatalytic Solar Hydrogen Conversion

Synthesis of Ag3PO4/G-C3N4 Composite with Enhanced Photocatalytic Performance for the Photodegradation of Diclofenac under Visible Light Irradiation

Carbon dots decorated graphitic carbon nitride as an efficient metal-free photocatalyst for phenol degradation

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