The photocatalytic degradation of a binary textile dyes mixture within a new configuration of loop reactor using ZnO thin film-phytotoxicity control

Cherif, S.; Bonnet, Pierre; Frezet, Lawrence; Kane, Abdoulaye; Assadi, Aymen Amine; Trari, M.; Yazid, Hynda; Djelal, Hayet

doi:10.5802/crchim.198

Cited by 2 publications

(2 citation statements)

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“…While the sample’s crystal structure and growth direction were analyzed using a D8 Bruker Advance X-ray diffractometer with Cu ka radiation (λ = 1.54 nm) and X-ray diffraction (XRD)—Bruker (Billerica, MA, USA). The average crystallite size was obtained from the X-ray line extended analysis using the Debye–Scherrer method [ 33 , 34 ]. The detailed material properties of the ZnO NRs/rGO-based nanorods have been reported in our previous report [ 18 ].…”

Section: Synthesis and Fabrications Methodsmentioning

confidence: 99%

ZnO NRs/rGO Photocatalyst in a Polymer-Based Microfluidic Platform

et al. 2023

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This paper reports the development of ZnO NRs/rGO-based photocatalysts integrated into a tree-branched polymer-based microfluidic reactor for efficient photodegradation of water contaminants. The reactor system includes a photocatalytic reactor, tree-branched microfluidic channels, and ZnO nanorods (NRs) coated with reduced graphene oxide (rGO) on a glass substrate within an area of 0.6 × 0.6 cm2. The ZnO NRs/rGO acts as a photocatalyst layer grown hydrothermally and then spray-coated with rGO. The microfluidic system is made of PDMS and fabricated using soft lithography (micro molding using SU-8 master mold patterned on a silicon wafer). The device geometry is designed using AutoCAD software and the flow properties of the microfluidics are simulated using COMSOL Multiphysics. The microfluidic platform’s photocatalytic process aims to bring the nanostructured photocatalyst into very close proximity to the water flow channel, reducing the interaction time and providing effective purification performance. Our functionality test showed that a degradation efficiency of 23.12 %, within the effective residence time of less than 3 s was obtained.

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Section: Synthesis and Fabrications Methodsmentioning

confidence: 99%

ZnO NRs/rGO Photocatalyst in a Polymer-Based Microfluidic Platform

et al. 2023

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“…Xiao et al showed a 98% RhB removal in solution on activated carbon from white sugar [15]. AOPs as ozonation [16], photocatalysis [17][18][19][20], sono-photocatalysis [3], and ultrasound-assisted TiO 2 photocatalysis [21] presented hopeful results. These methods, although effective, involve the use or production of compounds whose environmental impact is not well known.…”

Section: Introductionmentioning

confidence: 99%

Comparative Study of Rhodamine B Treatment: Assessing of Efficiency Processes and Ecotoxicity of By-Products

Chadelaud,

Zeghioud,

Reynoso de la Garza

et al. 2023

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In this work, a comparative study between two processes was performed—biodegradation and photocatalysis, as an advanced oxidation process—to discover which one is more efficient to degrade Rhodamine B, a synthetic dye widely used in the textile and food industries. The advantage of this study is that it correlates treatment efficiency with the ecotoxicity of the by-products resulting from the treatments. Since the COVID-19 pandemic, it has been difficult to use activated sludge because of the risk factor of COVID-19 infection. Therefore, biodegradation tests were conducted with the yeast Saccharomyces cerevisiae in this study. For the photocatalysis assays, TiO2 doped with 5 per cent Cerium was used as a catalyst under UV light irradiation. S. cerevisiae cannot reduce RhB by biodegradation. However, a 13 per cent biosorption was observed with an uptake capacity of 4.2 mg g−1 dry matter of S. cerevisiae cultivated in the presence of 5 mg L−1 of RhB after 150 min. At a 5 mg L−1 of RhB concentration, the 6 h photocatalysis treatment led to 55% color removal and 8.6% COT reduction. The biodegradability of the photocatalyzed solution increased since the BOD5/COD ratio raised from 0.10 to 0.42. In the presence of glucose as a source of carbon, yeast can grow on the by-products generated by photocatalysis. The phytotoxicity of RhB in solution was measured using the germination index (GI) of watercress seeds. The GI decreases by 75% for an RhB solution of 100 mg L−1 compared to the control sample. The by-products of the photocatalytic treatment, using crustaceans Daphnia magna and conducted with solutions of Rhodamine B, induced a decrease of 24% in the GI. Lethality test. After 3 or 6 h of treatment, no increase in immobilization or mortality of D. magna was observed compared to the negative control.

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The photocatalytic degradation of a binary textile dyes mixture within a new configuration of loop reactor using ZnO thin film-phytotoxicity control

Abstract: This article is licensed under the Creative Commons Attribution 4.0 International License. http://creativecommons.org/licenses/by/4.0/ Les Comptes Rendus. Chimie sont membres du Centre Mersenne pour l'édition scientifique ouverte www.centre-mersenne.org

Cited by 2 publications

References 88 publications

ZnO NRs/rGO Photocatalyst in a Polymer-Based Microfluidic Platform

ZnO NRs/rGO Photocatalyst in a Polymer-Based Microfluidic Platform

Comparative Study of Rhodamine B Treatment: Assessing of Efficiency Processes and Ecotoxicity of By-Products

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