Highly dispersive and stable Fe<sup>3+</sup> active sites on 2D graphitic carbon nitride nanosheets for efficient visible-light photocatalytic nitrogen fixation

A novel hybrid nanocomposite of g‐C3N4/ZnFe2O4 was successfully prepared by a facile hydrothermal method followed by an annealing process. The obtain hybrid catalyst was systematically characterized by XRD, TEM, HRTEM, FT‐IR, UV‐DRS and XPS analysis in order to study the structural, morphological, optical properties and chemical states. The cubic phase ZnFe2O4 crystalline structure and spherical morphology with sizes in the range of 30–35 nm were adequately anchored on the g‐C3N4 sheets. The HR‐TEM image suggests the successful embedment of ZnFe2O4 nanostructures on g‐C3N4 sheets. The photocatalytic activity of the catalyst was investigated using nitrobenzene (NB) and Cr (VI) under visible light. The improved activity of ZnFe2O4/ g‐C3N4 is due to the synergetic effect of superior visible‐light utilization and effective charge carrier separation between g‐C3N4 and ZnFe2O4 nanoparticles. Hence, this heterostructure could be used as a favorable applicant for environmental remediation application for the removal of organic pollutants and metal ions in practical application.

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“…OH) and ( . ‐O 2 ) radicals . The photogenerated electrons lead to the arrangement of solid oxidative species .…”

Section: Resultsmentioning

confidence: 99%

Hydrothermal Assisted Synthesis of ZnFe₂O₄ Embedded g‐C₃N₄ Nanocomposite with Enhanced Charge Transfer Ability for Effective Removal of Nitrobenzene and Cr(VI)

et al. 2020

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“…Figure 6d shows core level spectrum of C 1 s, in which, binding energy values centered at around 283, 285 and 286 eV are observed. The peak at 283 eV is typically ascribed to the sp 2 C=C bonds, the peak at 285 eV can be assigned to the sp 2 -hybridized carbon atom bonded to three nitrogen atoms in the g-C 3 N 4 layer and the peak at 286 eV can be attributed to the sp 2 carbon atoms in the aromatic ring attached to the -NH 2 group [52,53]. Figure 6e shows core level spectrum of N 1 s, in which, three peaks were absorbed at 395, 397 and 399 eV.…”

Section: Photoluminescence Studiesmentioning

confidence: 99%

Graphitic carbon nitride nanoplatelets incorporated titania based type-II heterostructure and its enhanced performance in photoelectrocatalytic water splitting

et al. 2020

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In this present work, the synthesis of g-C 3 N 4 /TiO 2 nanocomposites with different wt.% g-C 3 N 4 to form a type-II heterostructure and its potential application towards photoelectrocatalytic water splitting was discussed. The synthesized g-C 3 N 4 nanoplatelets incorporated TiO 2 nanocomposites were characterized by various analytical techniques such as UV-vis diffuse reflectance spectroscopy, X-ray diffraction, Fourier transform infrared spectroscopy, photoluminescence spectroscopy, X-ray photoelectron spectroscopy, thermogravimetric analysis and high-resolution transmission electron microscopy (HRTEM). HRTEM confirms the formation of type-II heterostructure consists of g-C 3 N 4 nanoplatelets incorporated titania in the nanocomposite. The photoelectrocatalytic activity of the TiO 2 , g-C 3 N 4 , and g-C 3 N 4 /TiO 2 nanocomposite were investigated under AM 1.5G (100 mW cm −2) illumination in 1 M KOH. The g-C 3 N 4 /TiO 2 (with 10 wt.% of g-C 3 N 4) nanocomposite photoanode exhibits photocurrent density of 142.7 μA cm −2 (at 1.23 V vs. RHE) which is ~ 1.8-fold higher than bare TiO 2 (80.5 μA cm −2 at 1.23 V vs. RHE). The enhancement in PEC activity explained by formation of type-II heterostructure between g-C 3 N 4 and TiO 2 , which reduced the recombination rate of photo-generated electron-hole pairs and also extends the absorption of TiO 2 to visible light range and boost up the interfacial charge transfer between electrode/electrolyte interface, which enhance the PEC activity of the g-C 3 N 4 /TiO 2 nanocomposite towards water splitting.

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“…Recently, Yao et al covalently grafted an EDTA functional group onto PCN nanosheets (CNNS) through the dehydration reaction between the NH 2 group on PCN and the carboxyl unit of EDTA, which allowed for subsequent chelating with Fe 3+ ions to form Fe–EDTA complex motifs on the PCN nanosheet surface (Figure 22c). [ 154 ] In comparison with the simply chemisorbed iron ions and the loaded iron oxide nanoparticles on the PCN nanosheets, the grafted Fe–EDTA moieties supplied highly dispersed iron active sites with high stability due to the strong chelating action. The Fe–EDTA complex functionalized PCN nanosheets showed remarkably enhanced photocatalytic nitrogen fixation efficiency because the Fe–EDTA unit decreased the N 2 adsorption energy and its electron withdrawing effect enabled accumulation of photoexcited electrons to activate the adsorbed N 2 molecules.…”

Section: Strategies Of Pcn Functionalizationsmentioning

confidence: 99%

Section: Strategies Of Pcn Functionalizationsmentioning

confidence: 99%

Atomic‐ and Molecular‐Level Functionalizations of Polymeric Carbon Nitride for Solar Fuel Production

Zhen

Xue

2020

Solar RRL

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Polymeric carbon nitride (PCN) is a metal‐free semiconductor that has received extensive research attention due to its unique advantages such as low cost, high stability, and visible‐light response. However, pristine PCN is not an ideal photocatalyst because of fast electron–hole recombination and its inert surface for molecular adsorption. Nevertheless, benefiting from the N‐linked tri‐s‐triazine structure, PCN can be readily functionalized through chemical modifications. As such, researchers have made enormous efforts to develop various strategies for modifying PCN to achieve enhanced photocatalytic activities. Herein, recent advances in PCN functionalizations with different atomic or molecular units, including metal and nonmetal elements, small functional groups, organic functional fragments, and metal complex motifs, are summarized. Moreover, the effect of different PCN functionalization strategies on the molecular structure, optical properties, electronic behaviors, and photocatalytic activities particularly for water splitting and CO2 reduction is discussed. In the end, the remaining challenges in the structural modification of PCN and future opportunities of functional PCN‐based photocatalysts for efficient solar fuel production are elaborated on.

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Highly dispersive and stable Fe³⁺ active sites on 2D graphitic carbon nitride nanosheets for efficient visible-light photocatalytic nitrogen fixation

Abstract: Highly dispersive and stable chelated Fe active sites on 2D graphitic carbon nitride nanosheets exhibit effective N2 molecule capture capacity for improving visible-light photocatalytic N2 fixation performance.

Cited by 154 publications

References 67 publications

Hydrothermal Assisted Synthesis of ZnFe₂O₄ Embedded g‐C₃N₄ Nanocomposite with Enhanced Charge Transfer Ability for Effective Removal of Nitrobenzene and Cr(VI)

Hydrothermal Assisted Synthesis of ZnFe₂O₄ Embedded g‐C₃N₄ Nanocomposite with Enhanced Charge Transfer Ability for Effective Removal of Nitrobenzene and Cr(VI)

Graphitic carbon nitride nanoplatelets incorporated titania based type-II heterostructure and its enhanced performance in photoelectrocatalytic water splitting

Atomic‐ and Molecular‐Level Functionalizations of Polymeric Carbon Nitride for Solar Fuel Production

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Highly dispersive and stable Fe3+ active sites on 2D graphitic carbon nitride nanosheets for efficient visible-light photocatalytic nitrogen fixation

Abstract: Highly dispersive and stable chelated Fe active sites on 2D graphitic carbon nitride nanosheets exhibit effective N2 molecule capture capacity for improving visible-light photocatalytic N2 fixation performance.

Cited by 154 publications

References 67 publications

Hydrothermal Assisted Synthesis of ZnFe2O4 Embedded g‐C3N4 Nanocomposite with Enhanced Charge Transfer Ability for Effective Removal of Nitrobenzene and Cr(VI)

Hydrothermal Assisted Synthesis of ZnFe2O4 Embedded g‐C3N4 Nanocomposite with Enhanced Charge Transfer Ability for Effective Removal of Nitrobenzene and Cr(VI)

Graphitic carbon nitride nanoplatelets incorporated titania based type-II heterostructure and its enhanced performance in photoelectrocatalytic water splitting

Atomic‐ and Molecular‐Level Functionalizations of Polymeric Carbon Nitride for Solar Fuel Production

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Highly dispersive and stable Fe³⁺ active sites on 2D graphitic carbon nitride nanosheets for efficient visible-light photocatalytic nitrogen fixation

Hydrothermal Assisted Synthesis of ZnFe₂O₄ Embedded g‐C₃N₄ Nanocomposite with Enhanced Charge Transfer Ability for Effective Removal of Nitrobenzene and Cr(VI)

Hydrothermal Assisted Synthesis of ZnFe₂O₄ Embedded g‐C₃N₄ Nanocomposite with Enhanced Charge Transfer Ability for Effective Removal of Nitrobenzene and Cr(VI)