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Kinetics of oxidative degradation/mineralization pathways of the antibiotic tetracycline by the novel heterogeneous electro-Fenton process with solid catalyst chalcopyrite

Barhoumi, Natija ; Olvera-Vargas, Hugo ; Oturan, Nihal ; Huguenot, David ; Gadri, Abdellatif ; Ammar, Salah ; Brillas, Enric ; Oturan, Mehmet A.

Applied catalysis. B, Environmental, 2017-07, Vol.209, p.637-647 [Periódico revisado por pares]

Amsterdam: Elsevier BV

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Título:
Kinetics of oxidative degradation/mineralization pathways of the antibiotic tetracycline by the novel heterogeneous electro-Fenton process with solid catalyst chalcopyrite
Autor: Barhoumi, Natija ; Olvera-Vargas, Hugo ; Oturan, Nihal ; Huguenot, David ; Gadri, Abdellatif ; Ammar, Salah ; Brillas, Enric ; Oturan, Mehmet A.
Assuntos: Analytical chemistry ; Anode effect ; Antibiotics ; Boron ; Byproducts ; Catalysis ; Catalysts ; Catalytic oxidation ; Chalcopyrite ; Chemical engineering ; Chemical Sciences ; Competition ; Copper ; Decay rate ; Degradation ; Diamonds ; Electrochemistry ; Environmental Engineering ; Environmental Sciences ; Free radicals ; Hydrogen peroxide ; Hydroxyl radicals ; Iron ; Kinetics ; Mineralization ; Organic carbon ; Oxidation ; Oxidation process ; Powder ; Reaction kinetics ; Salts ; Studies ; Sulfide compounds ; Total organic carbon ; Toxicity
É parte de: Applied catalysis. B, Environmental, 2017-07, Vol.209, p.637-647
Descrição: The degradation of solutions of the antibiotic tetracycline (TC) has been studied by a novel electrochemical advanced oxidation process, consisting in electro-Fenton (EF) process using chalcopyrite as heterogeneous catalyst. In fact, chalcopyrite powder was the source of Fe2+ and Cu2+ ions instead of a soluble catalyst salt used in conventional EF. Experiments were performed in an undivided cell equipped with a Pt or boron-doped diamond (BDD) anode and a carbon felt cathode, where TC and its oxidation intermediate products were destroyed by hydroxyl radicals (radical dotOH) formed both, in the bulk solution from electrochemically induced Fenton's reaction (Fe2+ and H2O2) and Fenton's-like reaction (Cu+ and H2O2), and at the anode surface from water oxidation. The effects of operating parameters such as applied current, chalcopyrite concentration and anode material were investigated. TC decay followed pseudo-first-order reaction kinetics. The absolute rate constant for TC oxidation by radical dotOH was found to be 3.2 x 109 M-1 s-1, as determined by the competition kinetic method. EF process using chalcopyrite as heterogeneous catalyst showed to be more efficient than conventional EF, achieving almost total mineralization of the TC solution (98% of total organic carbon removal) after 360 min under optimum operating conditions. A plausible mineralization pathway for mineralization of TC aqueous solution by radical dotOH was proposed based on the identification of different oxidation by-products. Moreover, toxicity tests pointed out that this heterogeneous EF process was able to detoxify the TC solutions.
Editor: Amsterdam: Elsevier BV
Idioma: Inglês

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Kinetics of oxidative degradation/mineralization pathways of the antibiotic tetracycline by the novel heterogeneous electro-Fenton process with solid catalyst chalcopyrite

Barhoumi, Natija ; Olvera-Vargas, Hugo ; Oturan, Nihal ; Huguenot, David ; Gadri, Abdellatif ; Ammar, Salah ; Brillas, Enric ; Oturan, Mehmet A.

Amsterdam: Elsevier BV

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