One-pot synthesis of K-doped g-C3N4 nanosheets with enhanced photocatalytic hydrogen production under visible-light irradiation

Wang, Yanyun; Zhao, Shuo; Zhang, Yiwei; Fang, Jiasheng; Zhou, Yuming; Yuan, Shenhao; Zhang, Chao; Chen, Wenxia

doi:10.1016/j.apsusc.2018.01.091

Cited by 179 publications

(46 citation statements)

References 41 publications

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“…The peaks of N‐CNNS and N‐O‐CNNS were sharper than those of BCN. The broad peaks at 2900–3340 cm −1 were attributed to NH/NH 2 stretching and indicated the presence of nitrogen in all samples . The broad peaks at 3433–3570 cm −1 were ascribed to hydroxyl groups/adsorbed water.…”

Section: Resultsmentioning

confidence: 86%

Constructing Built‐in Electric Field in Ultrathin Graphitic Carbon Nitride Nanosheets by N and O Codoping for Enhanced Photocatalytic Hydrogen Evolution Activity

Yan

Yang

2019

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Codoping of N and O in ultrathin graphitic carbon nitride (g‐C3N4) nanosheets leads to an inner electric field. This field restrains the recombination of photogenerated carriers and, thus, enhances hydrogen evolution. The layered structure of codoped g‐C3N4 nanosheets (N‐O‐CNNS) not only provides abundant sites of contact with the reaction medium, but also decreases the distance over which the photogenerated electron–hole pairs are transported to the reaction interface. Quantum confinement in the ultrathin structure results in an increased bandgap and makes the photocatalytic reaction more favorable than bulk g‐C3N4. Under visible light irradiation, N‐O‐CNNS with 3 wt% Pt achieves a hydrogen evolution rate of 9.2 mmol g−1 h−1 and a value of 46.9 mmol g−1 h−1 under AM1.5 with 5 wt% Pt. Thus, this work paves the way for designing efficient nanostructures with increased separation/transfer efficiency of photogenerated carriers and, hence, increased photocatalytic activities.

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Section: Resultsmentioning

confidence: 86%

Constructing Built‐in Electric Field in Ultrathin Graphitic Carbon Nitride Nanosheets by N and O Codoping for Enhanced Photocatalytic Hydrogen Evolution Activity

Yan

Yang

2019

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“…45 The high-resolution O 1s spectra of CNLDHAgP4 (Figure 5c) reveal four distinct peaks attributed to the surface hydroxyl groups attached to metal center-O1 (531.5 eV), 46 lattice oxygen-O2 (530.5 eV), 47 under coordinated lattice oxygen related to oxygen vacancies-O3 (531.6 eV), 48 and absorbed water-O4 (532.8), 49 respectively. Moreover, the N 1s wide peak of CNLDHAgP4 (Figure 5d) could be fitted into three peaks and interpreted as (I) sp 2 N present in triazine ring units corresponding to the C–N=C group and is a vital part of sp 2 -bonded graphitic carbon nitride (398.3 eV), 50 (II) N–(C) 3 as bridged nitrogen atoms (399.8 eV), 50 and (III) the presence of chemisorbed nitrogen species as NH 4 + ions (403.4 eV), 51 respectively.…”

Section: Results and Discussionmentioning

confidence: 99%

Dynamics of Charge-Transfer Behavior in a Plasmon-Induced Quasi-Type-II p–n/n–n Dual Heterojunction in Ag@Ag₃PO₄/g-C₃N₄/NiFe LDH Nanocomposites for Photocatalytic Cr(VI) Reduction and Phenol Oxidation

2018

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In this work, a series of heterostructure Ag@Ag 3 PO 4 /g-C 3 N 4 /NiFe layered double hydroxide (LDH) nanocomposites were prepared by a combination of an electrostatic self-assembly and in situ photoreduction method. In this method, positively charged p-type Ag 3 PO 4 was electrostatically bonded to the self-assembled negatively charged surface of the n–n-type g-C 3 N 4 /NiFe (CNLDH) LDH hybrid material with partial reduction of Ag + to metallic Ag nanoparticles (NPs) by the photogenerated electrons and available surface −OH groups of LDH under visible light irradiation. The presence of Ag 3 PO 4 as a p-type semiconductor, the surface plasmon resonance (SPR) effect of metallic Ag NPs, and oxygen vacancies as O v -type defects in NiFe LDH could greatly achieve the quasi-type-II p–n/n–n dual heterojunctions, which was revealed by the shifted conduction band and valence band potentials in Mott–Schottky (M–S) analysis. Among all the optimized heterostructures, CNLDHAgP4 could achieve the highest photocatalytic Cr(VI) reduction rate of 97% and phenol oxidation rate of 90% in 2 h. The heterostructure CNLDHAgP4 photocatalyst possesses a unique morphology consisting of cubic phases of both Ag NPs and Ag 3 PO 4 , which adhered to the thin and curvy layers of the CNLDH hybrid for smooth electronic and ionic charge transport. Furthermore, the intimate Schottky barriers formed at the interface of quasi-type-II p–n/n–n dual heterojunctions were verified by the photoluminescence, linear sweep voltammetry, M–S, electrochemical impedance study, high-resolution transmission electron microscopy, and X-ray photoelectron spectroscopy studies. The SPR effect of Ag NPs and oxygen vacancies as O v -type defect in NiFe LDH can effectively accelerate the threshold of charge separation and be the main reason for the enhanced activity achieved by the as-fabricated heterostructure photocatalyst.

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“…In order to improve the photocatalytic properties of visible-light irradiation, many researchers have put great effort into modification using various methods, such as metallic elements doping, construction of semiconductor heterojunction, precious metal deposition, and organic acid modification. For instance, Wang et al [18] successfully designed a K-modified g-C 3 N 4 by facile thermal polymerization with KBr as the K source, where the rate of H 2 evolution was 5.6 times compared to pure g-C 3 N 4 . Sridharan et al [19] synthesized g-C 3 N 4 /TiO 2 using thermal transformation methodology, resulting in better pollutant degradation due to a synergistic heterojunction between g-C 3 N 4 and TiO 2 .…”

Section: Introductionmentioning

confidence: 99%

Fabrication of Novel Cyanuric Acid Modified g-C3N4/Kaolinite Composite with Enhanced Visible Light-Driven Photocatalytic Activity

Sun

Yuan

et al. 2018

Minerals

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A novel kind of cyanuric-acid-modified graphitic carbon nitride (g-C3N4)/kaolinite (m-CN/KA) composite with enhanced visible light-driven photocatalytic performance was fabricated through a facile two-step process. Rhodamine B (RhB) was taken as the target pollutant to study the photocatalytic performance of the synthesized catalysts. It is indicated that the cyanuric acid modification significantly enhanced photocatalytic activity under visible light illumination in comparison with the other reference samples. The apparent rate constant of m-CN/KA is almost 1.9 times and 4.0 times those of g-C3N4/kaolinite and bare g-C3N4, respectively. The superior photocatalytic performance of m-CN/KA could be ascribed, not only to the generation of abundant pore structure and reactive sites, but also to the efficient separation of the photogenerated electron-hole pairs. Furthermore, the possible photocatalytic degradation mechanism of m-CN/KA was also presented in this paper. It could be anticipated that this novel and efficient, metal-free, mineral-based photocatalytic composite has great application prospects in organic pollutant degradation.

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One-pot synthesis of K-doped g-C3N4 nanosheets with enhanced photocatalytic hydrogen production under visible-light irradiation

Cited by 179 publications

References 41 publications

Constructing Built‐in Electric Field in Ultrathin Graphitic Carbon Nitride Nanosheets by N and O Codoping for Enhanced Photocatalytic Hydrogen Evolution Activity

Constructing Built‐in Electric Field in Ultrathin Graphitic Carbon Nitride Nanosheets by N and O Codoping for Enhanced Photocatalytic Hydrogen Evolution Activity

Dynamics of Charge-Transfer Behavior in a Plasmon-Induced Quasi-Type-II p–n/n–n Dual Heterojunction in Ag@Ag₃PO₄/g-C₃N₄/NiFe LDH Nanocomposites for Photocatalytic Cr(VI) Reduction and Phenol Oxidation

Fabrication of Novel Cyanuric Acid Modified g-C3N4/Kaolinite Composite with Enhanced Visible Light-Driven Photocatalytic Activity

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One-pot synthesis of K-doped g-C3N4 nanosheets with enhanced photocatalytic hydrogen production under visible-light irradiation

Cited by 179 publications

References 41 publications

Constructing Built‐in Electric Field in Ultrathin Graphitic Carbon Nitride Nanosheets by N and O Codoping for Enhanced Photocatalytic Hydrogen Evolution Activity

Constructing Built‐in Electric Field in Ultrathin Graphitic Carbon Nitride Nanosheets by N and O Codoping for Enhanced Photocatalytic Hydrogen Evolution Activity

Dynamics of Charge-Transfer Behavior in a Plasmon-Induced Quasi-Type-II p–n/n–n Dual Heterojunction in Ag@Ag3PO4/g-C3N4/NiFe LDH Nanocomposites for Photocatalytic Cr(VI) Reduction and Phenol Oxidation

Fabrication of Novel Cyanuric Acid Modified g-C3N4/Kaolinite Composite with Enhanced Visible Light-Driven Photocatalytic Activity

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Dynamics of Charge-Transfer Behavior in a Plasmon-Induced Quasi-Type-II p–n/n–n Dual Heterojunction in Ag@Ag₃PO₄/g-C₃N₄/NiFe LDH Nanocomposites for Photocatalytic Cr(VI) Reduction and Phenol Oxidation