Construction of Novel Metal-Free Graphene Oxide/Graphitic Carbon Nitride Nanohybrids: A 2D–2D Amalgamation for the Effective Dedyeing of Waste Water

Prakash, K.; Karuthapandian, S.

doi:10.1007/s10904-020-01728-x

Cited by 18 publications

(6 citation statements)

References 62 publications

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“…In comparison to graphene, the oxidized state graphene oxide with plenty of oxygen-carrying functionalities is more attractive to make a heterojunction with carbon nitrides due to better effective interaction and semiconductive nature. ,,, A facile hydrothermal, mixing, or copyrolysis approach can afford the 2D/2D composite of GO and g-C 3 N 4 . For example, when GO and melamine were calcined together at 550 °C for 2 h, a 2D/2D composite was formed, which can degrade phenol more rapidly than other catalyst components .…”

Section: Carbon Nitride–carbon 2d/2d Vdw Structuresmentioning

confidence: 99%

Boosting Photocatalytic Activity Using Carbon Nitride Based 2D/2D van der Waals Heterojunctions

et al. 2021

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The surging demand for energy and staggering pollutants in the environment have geared the scientific community to explore sustainable pathways that are economically feasible and environmentally compelling. In this context, harnessing solar energy using semiconductor materials to generate charge pairs to drive photoredox reactions has been envisioned as a futuristic approach. Numerous inorganic crystals with promising nanoregime properties investigated in the past decade have yet to demonstrate practical application due to limited photon absorption and sluggish charge separation kinetics. Two-dimensional semiconductors with tunable optical and electronic properties and quasi-resistance-free lateral charge transfer mechanisms have shown great promise in photocatalysis. Polymeric graphitic carbon nitride (g-C3N4) is among the most promising candidates due to fine-tuned band edges and the feasibility of optimizing the optical properties via materials genomics. Constructing a two-dimensional (2D)/2D van der Waals (vdW) heterojunction by allies of 2D carbon nitride sheets and other 2D semiconductors has demonstrated enhanced charge separation with improved visible photon absorption, and the performance is not restricted by the lattice matching of constituting materials. With the advent of new 2D semiconductors over the recent past, the 2D/2D heterojunction assemblies are gaining momentum to design high performance photocatalysts for numerous applications. This review aims to highlight recent advancements and key understanding in carbon nitride based 2D/2D heterojunctions and their applications in photocatalysis, including small molecules activation, conversion, and degradations. We conclude with a forward-looking perspective discussing the key challenges and opportunity areas for future research.

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Section: Carbon Nitride–carbon 2d/2d Vdw Structuresmentioning

confidence: 99%

Boosting Photocatalytic Activity Using Carbon Nitride Based 2D/2D van der Waals Heterojunctions

et al. 2021

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“…The lowering of d -spacing is ascribed to electron localization and stronger binding between the layers in g-C 3 N 4 due to the presence of heteroatoms. This also corroborates with previous reports on the g-C 3 N 4 , and Se/g-C 3 N 4 composite . An interfringe separation of 0.65 nm (Figure g) also agrees well with a reported value of 0.68 nm.…”

Section: Resultsmentioning

confidence: 99%

Selenium/g-C₃N₄ with a Solid Li₄Ti₅O₁₂ Blocking Layer for Selective Li⁺ Ion Diffusion in Long-Lived Li–Se Batteries

Ojha

Pal

Deepa

2023

ACS Appl. Nano Mater.

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A durable Li−Se battery is fabricated by implementing a rational and facile design strategy for the cathode. The cathode consists of a Se/graphitic carbon nitride (g-C 3 N 4 ) composite combined with a solid lithium titanate (Li 4 Ti 5 O 12 , LTO) layer applied as a solid coating over the separator. The solid LTO layer has pores large enough to allow Li + ions to diffuse through to the anode during charging but small enough to effectively block the polyselenides formed during the discharging cycle and confine them to the cathode, thus inhibiting capacity fade and improving the operational lifespan. The micrometer-thick LTO barrier layer affords selective diffusion of Li + ions, with an average Li + diffusion coefficient of 6 × 10 −11 cm 2 s −1 , enabling reasonably fast ion transport and kinetics. Simultaneously, g-C 3 N 4 , which is rich with active heteroatom (N) sites, also affords a very high Li + ion adsorption, leading to an improved capacity compared to pristine Se. The Se/g-C 3 N 4 /LTO@separator-Li + /Li cell delivers a superior capacity (750 versus 538 mAh g −1 at 0.1 C-rate), rate capability (39% versus 22% capacity retention ongoing from 0.1 to 2 C-rate), and cycle life (498 versus 283 mAh g −1 reversible capacity after 400 cycles) compared to the equivalent cell devoid of the LTO layer. Extended long-term cycling metrics showed a 310 mAh g −1 reversible capacity at 2 C, with 78% retention after 1600 cycles, and reiterated the potential it has for scale-up and even commercial applications.

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“…We also considered the formation of a disordered 2D network, in which CN and the doped-graphene oxides are bonded on the same 2D plane [ 62 ]. Based on a literature report on a CN/graphene oxide 2D matrix, the XRD pattern of a disordered 2D network showed characteristic peaks for both species with a slight peak broadening and a slight peak shifting [ 64 ]. However, the XRD pattern of BMH (Fig.…”

Section: Resultsmentioning

confidence: 99%

Boron Carbon Oxynitride as a Novel Metal-Free Photocatalyst

et al. 2021

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Boron-based nanomaterials are emerging as non-toxic, earth-abundant (photo)electrocatalyst materials in solar energy conversion for the production of solar hydrogen fuel and environmental remediation. Boron carbon oxynitride (BCNO) is a quaternary semiconductor with electronic, optical, and physicochemical properties that can be tuned by varying the composition of boron, nitrogen, carbon, and oxygen. However, the relationship between BCNO's structure and -photocatalytic activity relationship has yet to be explored. We performed an in-depth spectroscopic analysis to elucidate the effect of using two different nitrogen precursors and the effect of annealing temperatures in the preparation of BCNO. BCNO nanodisks (D = 6.7 ± 1.1 nm) with turbostratic boron nitride diffraction patterns were prepared using guanidine hydrochloride as the nitrogen source precursor upon thermal annealing at 800°C. The X-ray photoelectron spectroscopy (XPS) surface elemental analysis of the BCNO nanodisks revealed the B, C, N, and O compositions to be 40.6%, 7.95%, 37.7%, and 13.8%, respectively. According to the solid-state 11B NMR analyses, the guanidine hydrochloride-derived BCNO nanodisks showed the formation of various tricoordinate BNx(OH)3−x species, which also served as one of the photocatalytic active sites. The XRD and in-depth spectroscopic analyses corroborated the preparation of BCNO-doped hexagonal boron nitride nanodisks. In contrast, the BCNO annealed at 600 °C using melamine as the nitrogen precursor consisted of layered nanosheets composed of B, C, N, and O atoms covalently bonded in a honeycomb lattice as evidence by the XRD, XPS, and solid-state NMR analysis (11B and 13C) analyses. The XPS surface elemental composition of the melamine-derived BCNO layered structures consisted of a high carbon composition (75.1%) with a relatively low boron (5.24%) and nitrogen (7.27%) composition, which indicated the formation of BCNO-doped graphene oxides layered sheet structures. This series of melamine-derived BCNO-doped graphene oxide layered structures were found to exhibit the highest photocatalytic activity, exceeding the photocatalytic activity of graphitic carbon nitride. In this layered structure, the formation of the tetracoordinate BNx(OH)3−x(CO) species and the rich graphitic domains were proposed to play an important role in the photocatalytic activity of the BCNO-doped graphene oxides layered structures. The optical band gap energies were measured to be 5.7 eV and 4.2 eV for BCNO-doped hexagonal boron nitride nanodisks and BCNO-doped graphene oxides layered structures, respectively. Finally, BCNO exhibited an ultralong photoluminescence with an average decay lifetime of 1.58, 2.10, 5.18, and 8.14 µs for BGH01, BGH03, BMH01, BMH03, respectively. This study provides a novel metal-free photocatalytic system and provides the first structural analysis regarding the origin of BCNO-based photocatalyst. Graphical Abstract

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Construction of Novel Metal-Free Graphene Oxide/Graphitic Carbon Nitride Nanohybrids: A 2D–2D Amalgamation for the Effective Dedyeing of Waste Water

Cited by 18 publications

References 62 publications

Boosting Photocatalytic Activity Using Carbon Nitride Based 2D/2D van der Waals Heterojunctions

Boosting Photocatalytic Activity Using Carbon Nitride Based 2D/2D van der Waals Heterojunctions

Selenium/g-C₃N₄ with a Solid Li₄Ti₅O₁₂ Blocking Layer for Selective Li⁺ Ion Diffusion in Long-Lived Li–Se Batteries

Boron Carbon Oxynitride as a Novel Metal-Free Photocatalyst

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Construction of Novel Metal-Free Graphene Oxide/Graphitic Carbon Nitride Nanohybrids: A 2D–2D Amalgamation for the Effective Dedyeing of Waste Water

Cited by 18 publications

References 62 publications

Boosting Photocatalytic Activity Using Carbon Nitride Based 2D/2D van der Waals Heterojunctions

Boosting Photocatalytic Activity Using Carbon Nitride Based 2D/2D van der Waals Heterojunctions

Selenium/g-C3N4 with a Solid Li4Ti5O12 Blocking Layer for Selective Li+ Ion Diffusion in Long-Lived Li–Se Batteries

Boron Carbon Oxynitride as a Novel Metal-Free Photocatalyst

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Selenium/g-C₃N₄ with a Solid Li₄Ti₅O₁₂ Blocking Layer for Selective Li⁺ Ion Diffusion in Long-Lived Li–Se Batteries