ZnO/g-C3N4 S scheme photocatalytic material with visible light response and enhanced photocatalytic performance

Bi, Ke; Qin, Xiujuan; Cheng, Song; Liu, Sile

doi:10.1016/j.diamond.2023.110143

Cited by 13 publications

(2 citation statements)

References 57 publications

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“…A relatively new and promising material, polymeric graphitic carbon nitride (g-C3N4) (CN), possesses suitable bands for heterojunction formation with ZnO and has been studied by different authors (Martins et al 2021;Dantas et al 2022;Bahiraei et al 2023). Bi et al (2023) synthesized ZnO/g-C3N4 via ultrasonic dispersion with good photocatalytic activity for Rhodamine B degradation. The results presented by the authors show that the photocatalytic degradation of the dye with ZnO/g-C3N4 (>95%) was higher than that when ZnO and g-C3N4 were used separately, that is, linked to the formation of the heterojunction between ZnO and g-C3N4 (Sousa et al 2020).…”

Section: Introductionmentioning

confidence: 99%

Enhanced Effluent Degradation with Zinc Oxide, Carbon Nitride, and Carbon Xerogel Trifecta on brass monoliths

Silva,

Garcia,

Rodrigues

et al. 2024

Preprint

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In recent years, heterogeneous photocatalysis has emerged as an alternative for the treatment of organic pollutants. This technique presents advantages such as low cost and ease of operation. However, finding a semiconductor material with operational viability and high activity under solar irradiation is a challenge, almost always in nanometric sizes. Furthermore, in many processes, the photocatalysts are suspended in the solution, which means that additional steps are required to remove them, which can make the technique economically unviable, especially when the catalysts are in nanometric size. This work aims to demonstrate the feasibility of using structured photocatalyst (ZnO, g-C3N4, and carbon xerogel), optimized for this photodegradation process. The synthesized materials were characterized by nitrogen adsorption and desorption techniques, X-ray diffraction (XRD), and diffuse reflectance spectroscopy (DRS). Adhesion testing demonstrated the efficiency of the deposition technique, with film adhesion exceeding 90%. The photocatalytic evaluation was performed with a mixture of three textile dyes in a recycle photoreactor, varying pH (4.7 and 10), recycle flow rate (2, 4, and 6 L h− 1), immobilized mass (1, 2, and 3 mg cm− 2), monolith height (1.5, 3.0, and 4.5 cm), and type of radiation (solar and visible artificials; and natural solar). The structured photocatalyst was able to degrade over 99% of the dye mixture using artificial radiation. The results obtained using solar energy were highly promising, achieving a degradation efficiency of approximately 74%. Furthermore, it was possible to regenerate the structured photocatalyst up to seven consecutive times using exclusively natural solar light and maintain a degradation rate of around 70%. These results reinforce the feasibility and potential application of this system in photocatalytic reactions, highlighting its effectiveness and sustainability.

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Section: Introductionmentioning

confidence: 99%

Enhanced Effluent Degradation with Zinc Oxide, Carbon Nitride, and Carbon Xerogel Trifecta on brass monoliths

Silva,

Garcia,

Rodrigues

et al. 2024

Preprint

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“…ZnO-based nanocomposites have good potential applications in solar cells [1], photoelectrical devices [2], energy storage [3,4], water splitting [5], supercapacitors [6], gas sensors [7][8][9][10][11], biosensors [12,13], photodetectors [14][15][16][17][18][19][20][21][22][23], photocatalysts [24][25][26][27][28][29][30][31][32][33][34][35][36][37], removal of toxic gases [38], and so on. Because ZnO is only active in the UV region, this led to low efficiency in the energy and environmental fields.…”

Section: Introductionmentioning

confidence: 99%

Strong Interface Interaction of ZnO Nanosheets and MnSx Nanoparticles Triggered by Light over Wide Ranges of Wavelength to Enhance Their Removal of VOCs

Ma,

Zhang,

Gao

et al. 2023

Coatings

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The characteristics of the surface and interface of nanocomposites are important for exerting multi-functional properties and widening interdisciplinary applications. These properties are mainly depending on the electronic structures of materials. Some key factors, such as the surface, interface, grain boundaries, and defects take vital roles in the contribution of desired properties. Due to the excellent sensitivity of the QCM (quartz crystal microbalance) device, the surface and interface features of the nanocomposite were studied with the aid of the gas-response of the sensors (Sensor’s Gas-Sensitivity) in this work. To make full use of the visible light and part of NIR, a ZnO/MnSx nanocomposite was constructed using hydrothermal synthesis for narrowing the bandgap width of wide bandgap materials. The results indicated that the absorbance of the resulting nanocomposite was extended to part of the NIR range due to the introduction of impurity level or defect level, although ZnO and MnS belonged to wide bandgap semiconductor materials. To explore the physical mechanism of light activities, the photoconductive responses to weak visible light (650 nm, etc.) and NIR (near-infrared) (808 nm, 980 nm, and 1064 nm, etc.) were studied based on interdigital electrodes of Au on flexible PET (polyethylene terephthalate) film substrate with the casting method. The results showed that the on/off ratio of ZnO/MnSx nanocomposite to weak visible light and part of NIR light were changed by about one to five orders of magnitude, with changes varying with the amount of MnSx nanoparticle loading due to defect-assisted photoconductive behavior. It illustrated that the ZnO/MnSx nanocomposite easily produced photo-induced free charges, effectively avoiding the recombination of electrons/holes because of the formation of strong built-in electrical fields. To examine the surface and interface properties of nanocomposites, chemical prototype sensor arrays were constructed based on ZnO, ZnO/MnSx nanocomposite, and QCM arrays. The adsorption response behaviors of the sensor arrays to some typical volatile compounds were examined under a similar micro-environment. The results exhibited that in comparison to ZnO nanosheets, the ZnO nanosheets/MnSx nanocomposite increased adsorption properties to some typical organic volatile compounds significantly. It would have good potential applications in photo-catalysts, self-cleaning films, multi-functional coatings, and organic pollutants treatment (VOCs) of environmental fields for sustainable development. It provided some reference value to explore the physical mechanism of materials physics and photophysics for photo-active functional nanocomposites.

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Effect of additive modification on the product distribution in CO hydrogenation catalyzed by Fe/g-C3N4

Li,

Gao,

Wang

et al. 2024

Reac Kinet Mech Cat

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ZnO/g-C3N4 S scheme photocatalytic material with visible light response and enhanced photocatalytic performance

Cited by 13 publications

References 57 publications

Enhanced Effluent Degradation with Zinc Oxide, Carbon Nitride, and Carbon Xerogel Trifecta on brass monoliths

Enhanced Effluent Degradation with Zinc Oxide, Carbon Nitride, and Carbon Xerogel Trifecta on brass monoliths

Strong Interface Interaction of ZnO Nanosheets and MnSx Nanoparticles Triggered by Light over Wide Ranges of Wavelength to Enhance Their Removal of VOCs

Effect of additive modification on the product distribution in CO hydrogenation catalyzed by Fe/g-C3N4

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