Synthesis and Application of the Ternary Zn0.5Cd0.5S/ZnO/carbon Xerogel Composite in the Photocatalytic Degradation of 4-chlorophenol

Dantas, Gustavo Viégas Jucá; Moraes, Nícolas Perciani de; Rocha, Regina; Siervo, Abner de; Lanza, Marcos Roberto de Vasconcelos; Rodrigues, Liana Álvares

doi:10.1590/1980-5373-mr-2022-0038

Cited by 2 publications

(2 citation statements)

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“…In addition, it is noticeable that both ZnO and g-C3N4, as well as the ZnO/g-C3N4 combination, have practically negligible absorption in the visible range of the spectrum. In addition, g-C3N4 shows greater absorption than the other two materials at λ > 410 nm, indicating that the incorporation of the carbon xerogel significantly increased the radiation absorption capacity of the materials in the visible range, thus emphasizing the importance of the carbon matrix in improving charge transfer efficiency in this region (Moraes et al 2019(Moraes et al , 2020Haye et al 2020;Dantas et al 2022). The Tauc relation, (𝛼ℎ𝑣) 2 = 𝐾(ℎ𝑣 − 𝐸 𝑔 ), was used to determine the optical bandgap of the direct transition (Rocha et al 2023;Anandan et al 2014), where K is a constant and Eg is the optical bandgap of the material.…”

Section: Diffuse Reflectance Spectroscopy (Drs)mentioning

confidence: 99%

“…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.…”

Section: Introductionmentioning

confidence: 99%

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

Silva,

Garcia,

Rodrigues

et al. 2024

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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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