On the behaviour of Atrazine removal from water using fabrics as anodes and Cathodes

[EN] This study examines the degradation of atrazine (ATZ) with Pt-modified textile electrodes using an electrochemical method that is comparatively studied in two electrochemical cell configurations: cells with separated anodic and cathodic compartments (divided configuration); and without any separation (undivided configuration). The influence of the presence of chloride ions was studied. The best results were obtained when an undivided cell was used. The morphology and composition of the dispersed Pt coatings were analyzed using field emission scanning electron microscopy (FESEM) and Energy Dispersive X-Ray Analysis. The FESEM analyses confirmed that the textile surface was effectively modified by the electrocatalytic material. High performance liquid chromatography, gas chromatography mass spectrometry, and spectroscopic methods were used to follow the evolution of major oxidation products. Total organic carbon, chemical oxygen demand, and total nitrogen were used to evaluate the degradation efficiency of treated aqueous solutions. The experimental results obtained indicate that the efficiency of the electrochemical treatment was high with a low energy consumption when using electrodes based on textile materials, such as anodes or as cathodes (in particular, in electrolysis without compartment separation). All these can be produced at very competitive pricesSpanish Agencia Estatal de Investigacion (AEI) and European Union (FEDER funds) are acknowledged for the financial support (contracts MAT 2016-77742-C2-1-P and CTQ 2017-90659-RED). Chemviron Carbon who kindly donated the FlexzorbTM FM10 activated carbon fabrics and Funding for open access charge, CRUE-Universitat Politècnica de València, are acknowledged tooHamous, H.; Khenifi, A.; Orts Maiques, FJ.; Bonastre Cano, JA.; Cases, F. (2022). On the behaviour of Atrazine removal from water using fabrics as anodes and Cathodes. Chemosphere. 291(Part 1):1-8. https://doi.org/10.1016/j.chemosphere.2021.132738S18291Part

Carbon textiles electrodes modified with RGO and Pt nanoparticles used for electrochemical treatment of azo dye.

[EN] The efficiency of Orange G (OG) azo dye degradation using an electrochemical method under potentiostatic conditions has been comparatively studied in two electrolytic cells (divided and undivided cells) in the presence or absence of chloride ions with Pt-modified textile electrodes. The morphology of the carbon-based electrodes with nanoparticles of platinum electrochemically dispersed on their surface was analyzed using field emission scanning electron microscopy (FESEM) and EDX analysis. The FESEM analyses confirmed that the textile surface was coated by Pt nanoparticles. According to the experimental results obtained, when the same solutions are comparatively treated with the two cells, the undivided cell always gives a quicker decolorization than the divided cell ? and the decrease in total organic carbon (TOC), chemical oxygen demand (COD), and total nitrogen (TN) confirms this result. The degree of OG removal was monitored by spectroscopic methods and high-performance liquid chromatography (HPLC). The results indicate that that full best dye removal is obtained at a loaded charge of around 0.17 Ah L?1 which is associated with an electrical energy per order (EEO) of 0.189 kW h m?3 order?1. Based on the results obtained, the electrochemical process with TCRGO-Pt electrodes could be useful as a pretreatment technique or treatment for decolorizing wastewaters containing dyes.The authors wish to thank the Spanish Agencia Estatal de Investigaci?n (AEI) and European Union (FEDER funds) for the financial support (contract MAT2016-77742-C2-1-P) and Chemviron Carbon who kindly donated the FlexzorbTM FM10 activated carbon fabrics. The invitation by the E3TECH Spanish Network of Excellence (CTQ2017-90659-REDT (MEIC/AEI) ) is kindly acknowledgedHamous, H.; Khenifi, A.; Orts Maiques, FJ.; Bonastre Cano, JA.; Cases, F. (2021). Carbon textiles electrodes modified with RGO and Pt nanoparticles used for electrochemical treatment of azo dye. Journal of Electroanalytical Chemistry. 887:1-10. https://doi.org/10.1016/j.jelechem.2021.115154S11088

Thin bacteria/Layered Double Hydroxide films using a layer-by-layer approach.

International audienceThis paper reports the design of thin bacteria/Layered Double Hydroxides (LDH) films in which bacterial cells of Pseudomonas sp. strain ADP were assembled alternatively with Mg2Al-NO3 LDH nanosheets by a layer-by-layer deposition method. The UV–Vis spectroscopy was used to monitor the assembly process, showing a progressive increase in immobilized bacteria amount upon deposited cycles. The {ADP/LDH}n film was characterized by X-ray diffraction, infrared spectroscopy, scanning electron microscopy and atomic force microscopy. The metabolic activity of immobilized bacteria was determined using chronoamperometry by measuring the biochemical oxygen demand in presence of glucose using an artificial electron acceptor (Fe(CN)63−) at 0.5 V/Ag-AgCl. A steady current of 0.250 μA cm−2 was reached in about 30 s after the addition of 5 mM glucose