Construction of various morphological ZnO-NiO S-scheme nanocomposites for photocatalytic dye degradation

Reddy, N. Ramesh; Reddy, P. Mohan; Jung, Jae Hak; Joo, Sang Woo

doi:10.1016/j.inoche.2022.110107

Cited by 15 publications

(6 citation statements)

References 46 publications

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“…Similarly, blue color of the Methylene blue dye was completely vanished in just 30 min when 8 mg of sample was suspended in the dye solution. Observed results confirmed that synthesized ZnO nanoparticles and its calcium composites are very effective photodegradation of Methylene blue and Rhodamine B [47,48] .…”

Section: Effect Of Concentration Of Pop/ Pop11/pop21supporting

confidence: 68%

Photodegradation of Methylene blue and Rhodamine B using potato starch mediated zinc oxide nanoparticles and its calcium nanocomposites: Greener approach

Singh

Anuradha

Kumar

et al. 2023

ACE

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Zinc oxide is considered an effective photocatalyst for degradation of several organic contaminants found in wastewater. This work reports the biological synthesis of zinc oxide nanoparticles and its calcium nanocomposites to study the photocatalytic deterioration of two dyes, viz. Rhodamine B and Methylene blue, under natural sunlight. Nanoparticles were synthesized using zinc acetate and starch extracted from potato at pH 7–8. Potato starch acts as both a capping agent and a reducing agent. They were characterized spectroscopically via XRD, SEM, HR-TEM, EDAX and FT-IR techniques. Bean/spherical shaped ZnO NPs were obtained in the size range of 29–49 nm whereas calcium coating on ZnO decreased the particle size, i.e., 25–35 nm. Their photocatalytic ability to degrade Rhodamine B and Methylene blue was studied under natural sunlight and monitored using UV-Vis spectrophotometer. Synthesized ZnO nanoparticles and its calcium coated ZnO nanocomposites showed promising results in degradation of these dyes. Methylene blue was completely degraded in an hour at 8 mg of the sample. Although degradation of Rhodamine dye was slow, synthesized samples were effective catalysts as compared to the ones reported in the literature.

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Section: Effect Of Concentration Of Pop/ Pop11/pop21supporting

confidence: 68%

Photodegradation of Methylene blue and Rhodamine B using potato starch mediated zinc oxide nanoparticles and its calcium nanocomposites: Greener approach

Singh

Anuradha

Kumar

et al. 2023

ACE

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“…A systematic study has been conducted on the photocatalytic activity of ZnO/NiO heterojunctions. According to the results, a type two heterojunction (staggered bap) has been achieved which promotes the fast interfacial charge transfer within the heterojunction which highly promotes the photocatalytic activity [33]. Therefore, the n-type ZnO/p-type NiO heterojunctions have outstanding photocatalytic activity that outperforms that of pure ZnO and pure NiO [23].…”

Section: Introductionmentioning

confidence: 99%

ZnO/NiO Nanocomposite with Enhanced Photocatalytic H2 Production

Hashim,

Usman,

Ahmad

et al. 2024

International Journal of Photoenergy

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Inorganic photocatalytic materials exhibiting a highly efficient response to ultraviolet-visible light spectrum have become a subject of widespread global interest. They offer a substantial prospect for generating green energy and mitigating water pollution. Zinc oxide (ZnO), among various semiconductors, proves advantageous for water-splitting applications due to its elevated reactivity, chemical stability, and nontoxic nature. However, its efficacy as a photocatalyst is hindered by limited light absorption capacity and swift charge carrier recombination. To improve charge separation and enhance responsiveness to ultraviolet-visible light photocatalysis, the formation of a heterojunction with another suitable semiconductor is beneficial. Thus, we employed hydrothermal route for the synthesis of the samples, which is a high-pressure method. The formations of ZnO/NiO heterostructures were revealed by scanning electron microscopy, X-ray diffraction analysis, energy-dispersive X-ray spectroscopy, and Fourier transform infrared spectroscopy. The nanocomposites were discovered to have a substantially higher photocatalytic activity for the generation of H2. The H2 production rates show that ZnO (i.e., 168.91 μmolg-1 h-1) exhibits good H2 production rates as compared to NiO (i.e., 135.74 μmolg-1 h-1). The best production rates were observed for ZN-30 (i.e., 247.56 μmolg-1 h-1) which is 1.46 times greater than ZnO and 1.82 times greater than NiO. This enhanced photocatalytic activity for ZN-30 is because of the good electron-hole pair separation due to the formation of depletion layer, suppression of fast charge recombination, and overcoming resistance corrosion.

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“…Several techniques including adsorption were used to treat the pollutants in wastewater. However, the incomplete removal of the contaminants and the generation of secondary pollutants are the main drawbacks of these conventional methods. − Interestingly, a semiconducting photocatalytic route is a promising technique for complete removal of the toxic organic pollutants. ,, Basically, the commercially available TiO 2 is a UV-active photocatalyst with low photoactivity under natural sunlight. − The ZnO photocatalyst has gained much attention because it shows excellent transport property, is inexpensive, and has a versatile morphology. − In addition, based on our previous studies, controlled synthesis can be performed very easily for the creation of ZnO with high performance and also with a low cost of production. ,,− Therefore, in comparison to TiO 2 , ZnO is much cheaper and very easy to synthesize controllably. Nevertheless, low sunlight performance and occurrence of the photocorrosion are the main drawbacks influencing the practical application of ZnO .…”

Section: Introductionmentioning

confidence: 99%

“… 26 − 31 The ZnO photocatalyst has gained much attention because it shows excellent transport property, is inexpensive, and has a versatile morphology. 32 − 34 In addition, based on our previous studies, controlled synthesis can be performed very easily for the creation of ZnO with high performance and also with a low cost of production. 1 , 3 , 5 − 7 Therefore, in comparison to TiO 2 , ZnO is much cheaper and very easy to synthesize controllably.…”

Section: Introductionmentioning

confidence: 99%

Ultrasound-Assisted Synthesis of a ZnO/BiVO₄ S-Scheme Heterojunction Photocatalyst for Degradation of the Reactive Red 141 Dye and Oxytetracycline Antibiotic

et al. 2023

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The preparation of novel sunlight active photocatalysts for complete removal of pollutants from aqueous solutions is a vital research topic in environmental protection. The present work reports the synthesis of a ZnO/BiVO4 S-scheme heterojunction photocatalyst for degradation of the reactive red dye and oxytetracycline antibiotic in wastewater. ZnO and BiVO4 were first fabricated by a hydrothermal technique, and then, the ZnO/BiVO4 heterostructure was synthesized using an ultrasonic route. An increase of the surface area, compared to that of ZnO, was found in ZnO/BiVO4. The enhancement of charge separation efficiency at the interface was obtained so that a remarkable enhancement of the photocatalytic performance was detected in the prepared heterojunction photocatalyst. Complete detoxification of harmful pollutants was achieved by using the economical solar energy. The removal of the pollutants follows the first-order reaction with the highest rate constant of 0.107 min–1. The stability of the prepared photocatalyst was detected after five cycles of use. The ZnO/BiVO4 S-scheme heterostructure photocatalyst still provides high photoactivity even after five times of use. Hydroxyl radicals play an important role in the removal of the pollutant. This work demonstrates a new route to create the step-scheme heterojunction with high photoactivity for complete removal of the toxic dye and antibiotic in the environment.

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Construction of various morphological ZnO-NiO S-scheme nanocomposites for photocatalytic dye degradation

Cited by 15 publications

References 46 publications

Photodegradation of Methylene blue and Rhodamine B using potato starch mediated zinc oxide nanoparticles and its calcium nanocomposites: Greener approach

Photodegradation of Methylene blue and Rhodamine B using potato starch mediated zinc oxide nanoparticles and its calcium nanocomposites: Greener approach

ZnO/NiO Nanocomposite with Enhanced Photocatalytic H2 Production

Ultrasound-Assisted Synthesis of a ZnO/BiVO₄ S-Scheme Heterojunction Photocatalyst for Degradation of the Reactive Red 141 Dye and Oxytetracycline Antibiotic

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Construction of various morphological ZnO-NiO S-scheme nanocomposites for photocatalytic dye degradation

Cited by 15 publications

References 46 publications

Photodegradation of Methylene blue and Rhodamine B using potato starch mediated zinc oxide nanoparticles and its calcium nanocomposites: Greener approach

Photodegradation of Methylene blue and Rhodamine B using potato starch mediated zinc oxide nanoparticles and its calcium nanocomposites: Greener approach

ZnO/NiO Nanocomposite with Enhanced Photocatalytic H2 Production

Ultrasound-Assisted Synthesis of a ZnO/BiVO4 S-Scheme Heterojunction Photocatalyst for Degradation of the Reactive Red 141 Dye and Oxytetracycline Antibiotic

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Ultrasound-Assisted Synthesis of a ZnO/BiVO₄ S-Scheme Heterojunction Photocatalyst for Degradation of the Reactive Red 141 Dye and Oxytetracycline Antibiotic