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3 article(s) from Kumar, Suneel

Perovskite-structured CaTiO₃ coupled with g-C₃N₄ as a heterojunction photocatalyst for organic pollutant degradation

Ashish Kumar,
Christian Schuerings,
Suneel Kumar,
Ajay Kumar and
Venkata Krishnan

Beilstein J. Nanotechnol. 2018, 9, 671–685, doi:10.3762/bjnano.9.62

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Figure 1: Powder X-ray diffraction patterns of g-C₃N₄, CT and CTCN heterojunction.

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Figure 2: FTIR spectra of g-C₃N₄, CT and CTCN heterojunction.

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Figure 3: Thermogravimetric analysis plots of g-C₃N₄, CT and CTCN heterojunction.

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Figure 4: SEM images of (a, b) g-C₃N₄ sheets, (c, d) CT flakes and (e, f) CTCN heterojunctions.

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Figure 5: TEM images of (a, b) g-C₃N₄ nanosheets, (c, d) CT flakes and (e, f) CTCN heterojunction.

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Figure 6: (a) UV–visible diffuse reflectance spectroscopy (DRS) spectra for g-C₃N₄, CT and CTCN heterojunctio...

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Figure 7: Photoluminescence spectra of g-C₃N₄, CT and CTCN heterojunction.

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Figure 8: Nitrogen adsorption–desorption curves for (a) g-C₃N₄ (b) CT and (c) CTCN heterojunction; BET surfac...

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Figure 9: Time-dependent absorption spectra of RhB degradation with the CTCN heterojunction under (a) UV ligh...

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Figure 10: Kinetic curves obtained by applying (a, b, c) pseudo-first-order and (d, e, f) the modified Freundl...

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Figure 11: Time-dependent absorption spectra of BPA degradation under sunlight irradiation (a) pure BPA (witho...

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Figure 12: (a) Photocatalyst reusability up to three cycles and (b) powder XRD pattern of a CTCN heterojunctio...

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Figure 13: Plausible mechanism of degradation of pollutants under sunlight irradiation using the CTCN heteroju...

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Figure 14: Effect of scavengers on the photocatalytic degradation of RhB using the CTCN heterojunction photoca...

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Supp Info

Full Research Paper

Published 21 Feb 2018

Full text

Two-dimensional carbon-based nanocomposites for photocatalytic energy generation and environmental remediation applications

Suneel Kumar,
Ashish Kumar,
Ashish Bahuguna,
Vipul Sharma and
Venkata Krishnan

Beilstein J. Nanotechnol. 2017, 8, 1571–1600, doi:10.3762/bjnano.8.159

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Figure 1: Schematic diagram of interfaces of (a) 0D-2D (b) 1D-2D, and (c) 2D-2D materials.

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Figure 2: Schematic illustration of the preparation of reduced graphene oxide (RGO) from graphite. Reprinted ...

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Figure 3: (a) Triazine, (b) tri-s-triazine (heptazine) structures of g-C₃N₄, (c) thermal polymerization of di...

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Figure 4: The principle of (a) photoelectrochemical water splitting and (b) photocatalytic water splitting fo...

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Figure 5: Band gaps and band positions of a) n-type semiconductors and b) p-type semiconductors used for nano...

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Figure 6: Energy level diagrams of GO with different degrees of reduction in comparison with the potentials f...

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Figure 7: (a) Comparative H₂ production rate over various GO–CdS nanocomposites under visible light irradiati...

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Figure 8: (a,b) TEM images of TiO₂–MoS₂–graphene composites and (c,d) high-resolution TEM images of TiO₂–MoS₂...

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Figure 9: Proposed mechanism for the photocatalytic H₂ generation over TiO₂–MoS₂–graphene composite. Reprinte...

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Figure 10: Proposed mechanism of BCN-T system under visible irradiation for H₂ generation, pollutant removal a...

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Figure 11: (a) Schematic illustration of the photocatalytic H₂ production over CaIn₂S₄/g–C₃N₄ catalysts and (b...

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Figure 12: (a) Schematic diagram showing the effect of SCN acid treatment that leads to the formation of a com...

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Figure 13: (a) HRTEM image of 1 wt % Au–g-C₃N₄ nanocomposite where the inset presents the corresponding SAED p...

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Figure 14: Proposed mechanism for the enhanced electron transfer in the graphene–g-C₃N₄ composites for photoca...

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Figure 15: Schematic illustration depicting the photosensitizer role of graphene in GR–ZnO nanocomposites for ...

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Figure 16: (a) Diagram showing the superior photocatalytic activity of the Au–RGO–ZnO heterostructures, (b) re...

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Figure 17: Z-scheme photocatalytic mechanism of the g-C₃N₄–Ag₃PO₄ hybrid photocatalyst under visible-light irr...

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Review

Published 03 Aug 2017

Full text

Role of RGO support and irradiation source on the photocatalytic activity of CdS–ZnO semiconductor nanostructures

Suneel Kumar,
Rahul Sharma,
Vipul Sharma,
Gurunarayanan Harith,
Vaidyanathan Sivakumar and
Venkata Krishnan

Beilstein J. Nanotechnol. 2016, 7, 1684–1697, doi:10.3762/bjnano.7.161

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Figure 1: XRD patterns of (a) graphite powder, (b) GO, (c) ZnO NR, (d) CdS NP, (e) CdS–ZnO and (f) CdS–ZnO–RG...

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Figure 2: UV–vis diffuse reflectance spectra (DRS) of GO, ZnO NR, CdS NP, CdS–ZnO and CdS–ZnO–RGO nanocomposi...

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Figure 3: Plots of the transformed Kubelka–Munk function vs the energy of light: (a) ZnO NR, (b) CdS NP, (c) ...

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Figure 4: SEM images (a) GO sheet (b) CdS NP and (c, d) ZnO NR.

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Figure 5: SEM images (a, b) CdS–ZnO binary nanocomposite and (c, d) CdS–ZnO–RGO ternary nanocomposite.

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Figure 6: TEM Images (a) GO sheets, (b) CdS NP, (c) CdS–ZnO binary composite, (d) CdS–ZnO–RGO ternary composi...

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Figure 7: FTIR spectra of (a) GO, (b) ZnO, (c) CdS, (d) CdS–ZnO and (e) CdS–ZnO–RGO nanocomposite.

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Figure 8: UV–vis absorption spectra of GO, ZnO NR, CdS NP, CdS–ZnO and CdS–ZnO–RGO nanocomposite.

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Figure 9: Time-dependent UV–vis spectra of photocatalytic degradation of MO: (a) visible light irradiation fr...

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Figure 10: Kinetic curves for degradation of MO under (a) visible light irradiation from a solar simulator and...

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Figure 11: Histogram showing the degradation rate (%) of MO under visible light irradiation from a solar simul...

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Scheme 1: Possible mechanism of the photocatalytic activity of CdS–ZnO–RGO ternary nanocomposite for degradat...

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Scheme 2: Possible mechanism of the photocatalytic activity of CdS–ZnO–RGO ternary nanocomposite for degradat...

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Full Research Paper

Published 11 Nov 2016

Full text

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Perovskite-structured CaTiO3 coupled with g-C3N4 as a heterojunction photocatalyst for organic pollutant degradation

Two-dimensional carbon-based nanocomposites for photocatalytic energy generation and environmental remediation applications

Role of RGO support and irradiation source on the photocatalytic activity of CdS–ZnO semiconductor nanostructures

Perovskite-structured CaTiO₃ coupled with g-C₃N₄ as a heterojunction photocatalyst for organic pollutant degradation