Photocatalytic degradation of RB5 textile dye using immobilized TiO2 in brass structured systems

Silva, Émerson F.M. da; Ximenes, Érika R.B.; Sales, Letícia B.V. de; Dantas, Erica J.M.; Oliveira, Evelle D.C.; Simões, Thiago B.; Ribeiro, André T.S.; Sánz, Oihane; Machado, Giovanna; Almeida, Luciano C.

doi:10.1016/j.cattod.2021.02.006

Cited by 15 publications

(2 citation statements)

References 63 publications

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“…At regular time intervals (i.e., 0, 2,5,10,15,20,25,30,40,50, and 60 min), 3 mL samples were collected from the electrochemical cell and the absorbance for each sample was evaluated using the UV-Vis spectrophotometer. The RB5 degradation efficiency was evaluated by comparing the absorbance of RB5 concentration at each time interval to the absorbance of its initial concentration (da Silva et al, 2022).…”

Section: Electrolysis Experiments and Analytical Measurementsmentioning

confidence: 99%

Reactive Black 5 Removal by Electrochemical Oxidation Using Titanium Dioxide Nanoparticle Electrodes

Kamati,

Yan,

Jianwei

2024

ejtas

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Reactive Black 5 (RB5) is a commonly employed azo dye that is widely utilized in textile dyeing procedures due to its intense black color and simple application. Wastewater containing this dye may be released into the environment, consequently causing harm to the environment and the organisms therein. Hence, there is a need to treat wastewater containing pollutants such as RB5. Electrocatalysis is an effective method to degrade organic pollutants. Titanium dioxide (TiO2) nanoparticles are examples of electrocatalysts and have demonstrated superior efficacy in the degradation of a variety of organic compounds compared to other investigated electrocatalysts. However, there is a lack of comprehensive knowledge regarding the electrocatalytic degradation efficiency, and reaction kinetics of RB5 degradation using TiO2 nanoparticles. This work aimed to investigate the potential of TiO2 nanoparticle electrodes for electrocatalytic degradation of RB5 dye in wastewater. Electrolysis experiments and analytical measurements were conducted to determine optimal conditions of parameters such as voltage, electrolyte composition, and concentration, as well as pH. Different RB5 concentrations were used to determine the suitable environment for degradation. Optimization revealed that the ideal voltage for RB5 removal was 6 V. Sodium chloride (NaCl), and sodium sulfate (Na2SO4) were used as electrolytes, with NaCl outperforming Na2SO4 in RB5 removal efficiency. The ideal NaCl concentration and pH for RB5 removal were found to be 0.05 M and 7, respectively. The range of system adaptation which yielded the highest removal efficiency was found to be 100 mg/L of RB5. Under these optimized conditions, the apparent rate constant decreased over time, indicating effective degradation.

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Section: Electrolysis Experiments and Analytical Measurementsmentioning

confidence: 99%

Reactive Black 5 Removal by Electrochemical Oxidation Using Titanium Dioxide Nanoparticle Electrodes

Kamati,

Yan,

Jianwei

2024

ejtas

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“…By increasing the mass ratio to 2 mg cm -2 , the entire brass was uniformly considered, forming a monolayer of photocatalyst. However, with a mass ratio of 3 mg cm -2 , catalyst clusters likely occurred in addition to the monolayer, which may have hindered the activation of the entire deposited material (Silva et al, 2022b). Additionally, according to Marcello et al (2020), thinner films may present greater difficulty in transferring the photogenerated charges, leading to a higher recombination rate.…”

Section: Effect Of the Immobilized Mass On The Surface Of The Monolithmentioning

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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One-step fabrication of Nafion-TiO2 composite immobilized on polyester filters for efficient photocatalytic applications

Santos,

Da Silva,

Oliveira

et al. 2023

J Mater Sci: Mater Electron

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Photocatalytic degradation of RB5 textile dye using immobilized TiO2 in brass structured systems

Cited by 15 publications

References 63 publications

Reactive Black 5 Removal by Electrochemical Oxidation Using Titanium Dioxide Nanoparticle Electrodes

Reactive Black 5 Removal by Electrochemical Oxidation Using Titanium Dioxide Nanoparticle Electrodes

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

One-step fabrication of Nafion-TiO2 composite immobilized on polyester filters for efficient photocatalytic applications

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