Facile construction of djembe-like ZnO and its composite with g-C3N4 as a visible-light-driven heterojunction photocatalyst for the degradation of organic dyes

Prabhu, Shivananda; Pudukudy, Manoj; Harish, S.; Navaneethan, M.; Sohila, S.; Murugesan, Kumarasamy; Ramesh, R.

doi:10.1016/j.mssp.2019.104754

Cited by 70 publications

(34 citation statements)

References 40 publications

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“…The absorption edge of the CN sample is about 470 nm and that of the ZO/CN series samples are about 400 nm, which indicates the intrinsic absorption of g-C 3 N 4 Fig. 4 The EDXS measurement of the ZO/CN-3 sample: a The scanning area of the ZO/CN-3 sample for element mapping and b The detailed element composition and ZnO, respectively [34]. With the increase of hydrothermal time, the intrinsic absorption of the ZO/CN series samples increases gradually in the UV region, which is due to the synergistic effect of the dissolution of ZnO seed particles and the growth of ZnO nanorods.…”

Section: Resultsmentioning

confidence: 99%

Preparation and photocatalytic properties of ZnO nanorods/g-C3N4 composite

Liu

et al. 2021

Appl. Phys. A

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ZnO nanorods/g-C 3 N 4 photocatalytic composite was prepared, and its structural and optical properties have been studied. Bulk graphite phase carbon nitride (g-C 3 N 4 ) was first prepared by a one-step thermal polymerization method, and ZnO nanorods were grown from the ZnO seed particles on the surface of g-C 3 N 4 by a hydrothermal method. The effects of hydrothermal reaction time on the morphology and photocatalytic properties of ZnO nanorods/g-C 3 N 4 composite were investigated. The hydrothermal reaction included two stages. The initial stage was dominated by the rapid deposition of Zn 2+ precursor in hydrothermal solution on ZnO seed particles to form ZnO seed layer, and the second stage was the hydrothermal growth of ZnO nanorods from the ZnO seed layer. In the second stage, two processes occurred simultaneously, namely, the dissolution of seed layer and the growth of ZnO nanorods. Hence, the composite prepared with different hydrothermal time shows different photocatalytic degradation mechanism to methyl orange (MO) solution. The photocatalytic performance of the composite sample with the grown time of 2 h is mainly attributed to separation efficiency of photogenerated carriers. For the composite sample with the grown time of 3 h, due to the partial dissolution of seed layer, its photocatalytic performance is mainly attributed to the surface reaction of ZnO nanorods. For the composite samples with the hydrothermal grown time of 4 and 5 h, the dense ZnO nanorods on the surface of g-C 3 N 4 improve the separation efficiency of the photogenerated carriers, and their photocatalytic performance is attributed to both carrier lifetime and surface reaction. As a result of synergy, the sample with the hydrothermal grown time of 3 h shows the best photocatalytic performance in all composite sample. KeywordsZnO nanorods • g-C 3 N 4 composites • Hydrothermal • Photocatalysis * Fucheng Yu

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Section: Resultsmentioning

confidence: 99%

Preparation and photocatalytic properties of ZnO nanorods/g-C3N4 composite

Liu

et al. 2021

Appl. Phys. A

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“…e MB degradation process was further investigated by the reaction kinetics [39,41]. e process was fitted via the following equation:…”

Section: Uv-vis Diffuse Reflectance Spectroscopy Analysismentioning

confidence: 99%

“…e enhanced photocatalytic activity of g-C 3 N 4 @ZnO nanocomposite under visible-light irradiation can be explained as follows (Figure 8): e band positions of the g-C 3 N 4 @ZnO can be calculated by the following empirical formulas [25,41,52]:…”

Section: Advances In Materials Science and Engineeringmentioning

confidence: 99%

In Situ g‐C₃N₄@Zno Nanocomposite: One‐Pot Hydrothermal Synthesis and Photocatalytic Performance under Visible Light Irradiation

Thi

Neto

Van

et al. 2021

Advances in Materials Science and Engineering

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In situ g-C3N4@ZnO nanocomposites (with 0, 1, 3, 5, and 7 wt.% of g-C3N4 in nanocomposite) were synthesized via a one-pot hydrothermal method using precursors of urea, zinc nitrate hexahydrate, and hexamethylenetetramine. The g-C3N4@ZnO nanocomposites were characterized by X-ray diffraction, scanning electron microscope, diffuse reflectance spectroscopy, and photoluminescence spectroscopy. The photocatalyst activity of g-C3N4@ZnO nanocomposites was evaluated via methylene blue degradation experiment under visible light irradiation. The g-C3N4@ZnO nanocomposites showed an enhancement in photocatalytic activity in comparison to pure ZnO which increased with the g-C3N4 content (1, 3, 5, and 7 wt.%) in nanocomposites. The photocatalytic activity reached the highest efficiency of 96.8% when the content of g-C3N4 was 7.0 wt.%. Nanocomposite having 7.0 wt.% of g-C3N4 also showed good recyclability with degradation efficiency higher than 90% even in the 4th use. The improvement of photocatalytic activity could be attributed to the adsorption ability and effective separation of electron-hole pairs between g-C3N4 and ZnO. This work implies a simple method to in situ prepare the nanocomposite material of g-C3N4 and semiconductors oxide for photocatalyst applications with high efficiency and good recyclability.

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“…Among the semiconductor materials, ZnO is direct wide bandgap (3.37 eV) semiconductor with high excitation-binding energy of 60 meV. It has been received enormous attention owing to its high photostability and excellent photocatalytic activity [21][22].…”

Section: Introductionmentioning

confidence: 99%

“…Though, the poor photocatalytic performance of ZnO under visible light illumination due to wide bandgap, its application as photocatalyst has been restricted, moreover, high recombination rates of photogenerated charge carriers further limits its activity [21].…”

Section: Introductionmentioning

confidence: 99%

Fabrication of g-C3N4/ZnO Nanoheterostructures for Effective Degradation of Methylene Blue Dye under Visible Light Irradiation

Meena

Poswal²,

Surela³

et al. 2022

Preprint

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In the present, the g-C3N4/ZnO hybrid nanoheterostructures photocatalysts with different weight percents of ZnO have been successfully prepared by a facile grinding, dehydration followed by pyrolysis method. The structural and textural properties of the prepared samples were investigated by X-ray diffraction (XRD), Fourier transform infrared (FT-IR) spectroscopy, field emission scanning electron microscopy combine electron dispersive spectroscopy (FESEM-EDS) and UV-vis spectroscopy. The photocatalytic performance of the fabricated g-C3N4/ZnO nanostructures was investigated for the degradation of methylene blue (MB) dye and it is determined much higher in compare to the bare g-C3N4 nanosheets and ZnO nanorods. The optimized ZnO content in the g-C3N4/ZnO photocatalyst was determined to be 25%. In the current study, 99.54% of MB dye is degraded in 60 min of visible light irradiation at pH = 10 over g-C3N4/ZnO (25%) photocatalyst. The results of the kinetic study reveals that photodegradation reactions have followed the first-order kinetics and the rate constant values of MB photodegradation in presence of prepared g-C3N4/ZnO (25%) is determined ∼13 and ∼7.76 times greater than that of the bare g-C3N4 and ZnO respectively. The enhanced photocatalytic efficiency of the fabricated g-C3N4/ZnO nanoheterostructures could be due to the creation of heterojunction by the coupling of two semiconductors of well matched band structures in which effective charge transfer has been occurred. The prepared g-C3N4/ZnO has demonstrated significant photostability after utilization in four runs of cycles. The decrease in the catalyst performance even after four repeated cycles is approximately 8%. The superoxide free radicals (•O2−) are the main reactive species participated in the degradation of MB dye. The current approach of fabrication of heterojunction has presented a competent and simplistic synthetic tactic of creation of visible-light-driven photocatalyst for the effective photocatalytic mineralization of organic dye contaminants in the aqueous medium.

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Facile construction of djembe-like ZnO and its composite with g-C3N4 as a visible-light-driven heterojunction photocatalyst for the degradation of organic dyes

Cited by 70 publications

References 40 publications

Preparation and photocatalytic properties of ZnO nanorods/g-C3N4 composite

Preparation and photocatalytic properties of ZnO nanorods/g-C3N4 composite

In Situ g‐C₃N₄@Zno Nanocomposite: One‐Pot Hydrothermal Synthesis and Photocatalytic Performance under Visible Light Irradiation

Fabrication of g-C3N4/ZnO Nanoheterostructures for Effective Degradation of Methylene Blue Dye under Visible Light Irradiation

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Facile construction of djembe-like ZnO and its composite with g-C3N4 as a visible-light-driven heterojunction photocatalyst for the degradation of organic dyes

Cited by 70 publications

References 40 publications

Preparation and photocatalytic properties of ZnO nanorods/g-C3N4 composite

Preparation and photocatalytic properties of ZnO nanorods/g-C3N4 composite

In Situ g‐C3N4@Zno Nanocomposite: One‐Pot Hydrothermal Synthesis and Photocatalytic Performance under Visible Light Irradiation

Fabrication of g-C3N4/ZnO Nanoheterostructures for Effective Degradation of Methylene Blue Dye under Visible Light Irradiation

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In Situ g‐C₃N₄@Zno Nanocomposite: One‐Pot Hydrothermal Synthesis and Photocatalytic Performance under Visible Light Irradiation